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<title>Adobe - Developer Center : Understanding Flex itemEditors – Part 2: Editing events and complex editors | Adobe Developer Connection</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<li class="SiteHeaderPanelLink"><a href="/solutions/testing-targeting.html?promoid=KAXLU" id="BusinessSolutions_Bybusinessneed_Testingandtargeting">Testing and targeting</a></li>
<li class="SiteHeaderPanelLink"><a href="/products/creativecloud/video.html?promoid=KAUDD" id="BusinessSolutions_Bybusinessneed_Videoeditingandserving">Video editing and serving</a></li>
<li class="SiteHeaderPanelLink"><a href="http://html.adobe.com?promoid=JZEFF" target="_blank" class="SiteHeaderLinkNewWindow" id="BusinessSolutions_Bybusinessneed_Webdevelopment">Web <span class="SiteHeaderIconNewWindowNoWrap">development<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
<li class="SiteHeaderPanelLink"><a href="/solutions/web-experience-management.html?promoid=JOOYM" id="BusinessSolutions_Bybusinessneed_Webexperiencemanagement">Web experience management</a></li>
</ul>
<ul class="SiteHeaderPanelLinkNoBottom">
<li class="SiteHeaderPanelLink"><a href="/solutions.html?promoid=JOOTI" id="BusinessSolutions_Seeallbusinessneeds">See all business needs</a></li>
</ul>
</div>
<div class="SiteHeaderColumn-2">
<p class="SiteHeaderPanelHeaderSmall">By industry</p>
<ul>
<li class="SiteHeaderPanelLink"><a href="/solutions/broadcasting.html?promoid=JOLIY" id="BusinessSolutions_Byindustry_Broadcast">Broadcast</a></li>
<li class="SiteHeaderPanelLink"><a href="/education.html?marketSegment=EDU&promoid=JOLIZ" id="BusinessSolutions_Byindustry_Education">Education</a></li>
<li class="SiteHeaderPanelLink"><a href="/solutions/financial-services.html?promoid=KAUDE" id="BusinessSolutions_Byindustry_Financialservices">Financial services</a></li>
<li class="SiteHeaderPanelLink"><a href="/solutions/government.html?promoid=KAUDF" id="BusinessSolutions_Byindustry_Government">Government</a></li>
<li class="SiteHeaderPanelLink"><a href="/solutions/digital-publishing.html?promoid=KAUDG" id="BusinessSolutions_Byindustry_Publishing">Publishing</a></li>
<li class="SiteHeaderPanelLink"><a href="/solutions/retail.html?promoid=KAWSD" id="BusinessSolutions_Byindustry_Retail">Retail</a></li>
</ul>
<ul class="SiteHeaderPanelLinkNoBottom">
<li class="SiteHeaderPanelLink"><a href="/solutions.html?promoid=KAUDH" id="BusinessSolutions_Seeallindustries">See all industries</a></li>
</ul>
</div>
</div>
</div>
</div>
<div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shSupportLearning">
<a href="http://helpx.adobe.com/support/?promoid=KAWQK" id="shSupportLearningLink" class="SiteHeaderBarLink">Support &amp; Learning</a>
<div class="SiteHeaderDropPanel SiteHeaderDropdown-Single" id="SupportLearningPanel">
<div class="SiteHeaderRow">
<p class="SiteHeaderPanelHeaderSmall">I need help</p>
<ul>
<li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/support/?promoid=JZEFP" id="SupportLearning_Ineedhelp_Products">Products</a></li>
<li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/creative-cloud/topics/getting-started.html?promoid=JZEFO" id="SupportLearning_Ineedhelp_AdobeCreativeCloud">Adobe Creative Cloud</a></li>
<li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/marketing-cloud.html?promoid=KAWSE" id="SupportLearning_Ineedhelp_AdobeMarketingCloud">Adobe Marketing Cloud</a></li>
<li class="SiteHeaderPanelLink"><a href="http://forums.adobe.com/index.jspa?promoid=JZEFM" target="_blank" id="SupportLearning_Ineedhelp_Forums"><span class="SiteHeaderIconNewWindowNoWrap">Forums<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
</ul>
<p class="SiteHeaderPanelHeaderSmall">I want to learn</p>
<ul class="SiteHeaderPanelLinkNoBottom">
<li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/learning.html?promoid=KAUDK" id="SupportLearning_Iwanttolearn_Trainingandtutorials">Training and tutorials</a></li>
<li class="SiteHeaderPanelLink"><a href="http://training.adobe.com/certification.html?promoid=KAUDM" target="_blank" id="SupportLearning_Iwanttolearn_Certification"><span class="SiteHeaderIconNewWindowNoWrap">Certification<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
<li class="SiteHeaderPanelLink"><a href="/devnet.html?promoid=KAUDN" id="SupportLearning_Iwanttolearn_AdobeDeveloperConnection">Adobe Developer Connection</a></li>
<li class="SiteHeaderPanelLink"><a href="/designcenter.html?promoid=KAUDO" id="SupportLearning_Iwanttolearn_AdobeDesignCenter">Adobe Design Center</a></li>
<li class="SiteHeaderPanelLink"><a href="http://tv.adobe.com?promoid=KFELF" target="_blank" id="SupportLearning_Iwanttolearn_AdobeTV">Adobe <span class="SiteHeaderIconNewWindowNoWrap">TV<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
<li class="SiteHeaderPanelLink"><a href="/solutions/digital-marketing/guides.html?promoid=KAWSF" id="SupportLearning_Iwanttolearn_AdobeMarketingCenter">Adobe Marketing Center</a></li>
<li class="SiteHeaderPanelLink"><a href="http://labs.adobe.com/?promoid=JZEFQ" target="_blank" id="SupportLearning_Iwanttolearn_AdobeLabs">Adobe <span class="SiteHeaderIconNewWindowNoWrap">Labs<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
</ul>
</div>
</div>
</div>
<div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shDownload">
<a href="/downloads/?promoid=KAWQL" id="shDownloadLink" class="SiteHeaderBarLink">Download</a>
<div class="SiteHeaderDropPanel SiteHeaderDropdown-Single" id="DownloadPanel">
<div class="SiteHeaderRow">
<ul>
<li class="SiteHeaderPanelLink"><a href="/downloads/?promoid=JZEFS" id="Download_Producttrials">Product trials</a></li>
<li class="SiteHeaderPanelLink"><a href="http://get.adobe.com/flashplayer/?promoid=JZEFT" id="Download_AdobeFlashPlayer">Adobe Flash Player</a></li>
<li class="SiteHeaderPanelLink"><a href="http://get.adobe.com/reader/?promoid=JZEFU" id="Download_AdobeReader">Adobe Reader</a></li>
<li class="SiteHeaderPanelLink"><a href="http://get.adobe.com/air/?promoid=JZEFV" id="Download_AdobeAIR">Adobe AIR</a></li>
</ul>
<ul class="SiteHeaderPanelLinkNoBottom">
<li class="SiteHeaderPanelLink"><a href="/downloads/?promoid=JZEFW" id="Download_Seealldownloads">See all downloads</a></li>
</ul>
</div>
</div>
</div>
<div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shCompany">
<a href="/company.html?promoid=KAWQM" id="shCompanyLink" class="SiteHeaderBarLink">Company</a>
<div class="SiteHeaderDropPanel SiteHeaderDropdown-Single" id="CompanyPanel">
<div class="SiteHeaderRow">
<ul>
<li class="SiteHeaderPanelLink"><a href="/careers.html?promoid=JZEFX" id="Company_CareersatAdobe">Careers at Adobe</a></li>
<li class="SiteHeaderPanelLink"><a href="/aboutadobe/invrelations/?promoid=JZEFZ" id="Company_InvestorRelations">Investor Relations</a></li>
<li class="SiteHeaderPanelLink"><a href="/aboutadobe/pressroom/?promoid=JZEGA" id="Company_Newsroom">Newsroom</a></li>
<li class="SiteHeaderPanelLink"><a href="/privacy.html?promoid=JZEGB" id="Company_Privacy">Privacy</a></li>
<li class="SiteHeaderPanelLink"><a href="/corporate-responsibility.html?promoid=JZEFY" id="Company_CorporateResponsibility">Corporate Responsibility</a></li>
<li class="SiteHeaderPanelLink"><a href="/customershowcase.html?promoid=KEWBG" id="Company_CustomerShowcase">Customer Showcase</a></li>
<li class="SiteHeaderPanelLink"><a href="/company/contact.html?promoid=JZEGC" id="Company_Contactus">Contact us</a></li>
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<ul class="SiteHeaderPanelLinkNoBottom">
<li class="SiteHeaderPanelLink"><a href="/company.html?promoid=JZPLK" id="Company_Morecompanyinfo">More company info</a></li>
</ul>
</div>
</div>
</div>
<div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shBuy">
<a href="/products/catalog/software._sl_id-contentfilter_sl_catalog_sl_software_sl_mostpopular.html?promoid=KAWQN" id="shBuyLink" class="SiteHeaderBarLink">Buy</a>
<div class="SiteHeaderDropPanel SiteHeaderDropdown-Single" id="BuyPanel">
<div class="SiteHeaderRow">
<ul class="SiteHeaderPanelLinkNoBottom">
<li class="SiteHeaderPanelLink"><a href="/products/catalog/software.html?marketSegment=COM&promoid=KAWQO" id="Buy_Forpersonalandprofessionaluse">For personal and professional use</a></li>
<li class="SiteHeaderPanelLink"><a href="/products/catalog/software._sl_id-contentfilter_sl_catalog_sl_education_sl_alledu.html?marketSegment=EDU&promoid=KAWQP" id="Buy_Forstudentseducatorsandstaff">For students, educators, and staff</a></li>
<li class="SiteHeaderPanelLink"><a href="/products/small-business-pricing/software-catalog._sl_id-contentfilter_sl_catalog_sl_software_sl_creativecloudmembership.html?marketSegment=COM&promoid=JOLJE" id="Buy_Forsmallandmediumbusinesses">For small and medium businesses</a></li>
<li class="SiteHeaderPanelLink"><a href="/volume-licensing.html?promoid=KAWQQ" id="Buy_VolumeLicensing">Volume Licensing</a></li>
<li class="SiteHeaderPanelLink"><a href="/products/discount-software-coupons.html?promoid=KAWQR" id="Buy_Specialoffers">Special offers</a></li>
<li class="SiteHeaderPanelLink"><a href="http://success.adobe.com/en/na/programs/rfi/dm_sales_inquiries.html?promoid=KAWSG" target="_blank" id="Buy_AdobeMarketingCloudsales">Adobe Marketing Cloud <span class="SiteHeaderIconNewWindowNoWrap">sales<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
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</div>
</div>
</div>
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<span id="tooltipStringExpandMenu">Expand menu</span>
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<a href="/go/gnav_search" id="shSearchButton" class="SiteHeaderBarItem SiteHeaderSearchButton" style="display: none;">Search</a>
<div class="SiteHeaderBarItem SiteHeaderBarItemLast">&nbsp;</div>
<div id="site-search" class="SiteHeaderSearch">
<input title="Search" type="text" id="search-input" name="term" maxlength="1000" />
<input type="hidden" id="searchbuddy-loc" name="loc" value="en_us" />
<button type="submit" id="search-submit" class="icon-replace search">Search</button>
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<div class="SiteHeaderUser">
<div id="shSignInBlock">
<a id="shInfo" class="SiteHeaderUserItem SiteHeaderInfo">Info</a>
<a href="/account/sign-in.adobedotcom.html" id="shSignIn" class="SiteHeaderUserItem LinkStrong">Sign in</a>
<div class="SiteHeaderPopPanelShadow width-250" id="InfoPanelShadow" style="display: none;"></div>
<div class="SiteHeaderPopPanel width-250" id="InfoPanel" style="display: none;">
<div class="SiteHeaderPanelRow">
<span class="SiteHeaderPanelHeader">Why sign in?</span>
Sign in to manage your account and access trial downloads, product extensions, community areas, and more.
</div>
</div>
</div>
<a href="/account.html" id="shWelcome" class="SiteHeaderUserItem SiteHeaderArrow LinkStrong" style="display: none;">Welcome, <span id="screenName"></span></a>
<div class="SiteHeaderPopPanelShadow" id="WelcomePanelShadow" style="display: none;"></div>
<div class="SiteHeaderPopPanel" id="WelcomePanel" style="display: none;">
<div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyAccount">
<a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_en_us">My Adobe</a>
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<div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyOrders">
<a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_myorders_en_us">My orders</a>
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<div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyInformation">
<a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_myinformation_en_us">My information</a>
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<div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyPreferences">
<a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_mypreferences_en_us">My preferences</a>
</div>
<div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyProductsServices">
<a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_myproducts_services_en_us">My products and services</a>
</div>
<div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shSignOut">
<a class="SiteHeaderPanelHeader" id="shSignOutLink" href="/cfusion/membership/logout.cfm">Sign out</a>
</div>
</div>
<div id="MyCartLinkContainer">
<a href="/go/gnav_mycart_en_us" id="shMyCart" class="SiteHeaderUserItem SiteHeaderCart">My cart<span id="cartQuantity"></span></a>
</div>
<a href="/privacy.html" id="shPrivacy" class="SiteHeaderUserItem">Privacy</a>
<a href="/go/gnav_myadobe_en_us" id="shMyAdobe" class="SiteHeaderUserItem">My Adobe</a>
</div>
</div>
</form>
<div id="SiteHeaderMobile" class="SiteHeaderMobile LayoutHidden LayoutSlim Text TextSmall">
<a href="/go/gnav_adobe_logo_en_us" id="shHomeMobile" class="SiteHeaderHome SiteHeaderHomeMobile">Adobe</a>
<div class="SiteHeaderBar SiteHeaderBarMobile" id="shBarMobile">
<span class="SiteHeaderBarItemMobile SiteHeaderBarItemMobileNoLeftBorder" id="shProductsMobileSpan"><a href="/go/gnav_products_en_us" id="shProductsMobile" class="SiteHeaderBarLink">Products</a></span>
<span class="SiteHeaderBarItemMobile" id="shSectionsMobileSpan"><a href="#" id="shSectionsMobile" class="SiteHeaderArrowMobile SiteHeaderBarLink">Sections</a></span>
<span class="SiteHeaderBarItemMobile" id="shSectionsMobileBuy"><a href="/go/gnav_store_en_us" id="shBuyMobile" class="SiteHeaderBarLink">Buy</a></span>
<span class="SiteHeaderBarItemMobile SiteHeaderBarItemMobileNoRightBorder SiteHeaderBarItemMobileNoPadding">&nbsp;</span>
<span class="SiteHeaderBarItemMobile SiteHeaderBarItemMobileNoRightBorder SiteHeaderBarItemFloatRight" id="shSearchMobileSpan"><a href="/go/gnav_search" id="shSearchMobile" class="SiteHeaderSearchButtonMobile">Search</a></span>
<span class="SiteHeaderBarItemMobile SiteHeaderBarItemMobileNoLeftBorder SiteHeaderBarItemFloatRight SiteHeaderBarItemMobileNoPadding">&nbsp;</span>
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<div class="SiteHeaderBarMobileExtend" id="shBarExtend">
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<div id="shBarExtendSections1" class="SiteHeaderBarMobileExtendSections">
<a href="/go/gnav_solutions_en_us" id="shSectionsSolutionsMobile" class="SiteHeaderBarExtendSectionsItem SiteHeaderBarLink">Solutions</a>
<a href="/go/gnav_company_en_us" id="shSectionsCompanyMobile" class="SiteHeaderBarExtendSectionsItem SiteHeaderBarLink">Company</a>
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<a href="/go/gnav_help_en_us" id="shSectionsHelpMobile" class="SiteHeaderBarExtendSectionsItem SiteHeaderBarLink">Help</a>
<a href="/go/gnav_learning_en_us" id="shSectionsLearningMobile" class="SiteHeaderBarExtendSectionsItem SiteHeaderBarLink">Learning</a>
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</div>
<div id="shBarExtendSearch" style="display: none;">
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<button type="submit" id="search-submit-mobile">Search</button>
</form>
</div>
</div>
<div class="SiteHeaderUser">
<a href="/cfusion/membership/index.cfm?loc=en_us&amp;nl=1" id="shSignInMobile" class="SiteHeaderUserItem SiteHeaderUserItemMobile LinkStrong">Sign in</a>
<a href="/cfusion/membership/logout.cfm" id="shSignOutMobile" class="SiteHeaderUserItem SiteHeaderUserItemMobile LinkStrong" style="display: none;">Sign out</a>
<a href="/privacy.html" id="shPrivacyMobile" class="SiteHeaderUserItem SiteHeaderUserItemMobile">Privacy</a>
<a href="/go/gnav_myadobe_en_us" id="shMyAdobeMobile" class="SiteHeaderUserItem SiteHeaderUserItemMobile">My Adobe</a>
</div>
</div>
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<div class="HoverCart-1 LayoutHItem">
<div style="padding-left:60px;" class=" LayoutBreakAfter LayoutPullout">
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<span id="HoverCartPreOrderHardGoodMsgxyz" style="display:none;" class="TextWarning TextPostScript">Preorder Estimated Availability <span id="HoverCartPreOrderHardGoodMsgDatexyz">Date</span>. Your credit card will not be charged until the product is shipped. Estimated availability date is subject to change.</span>
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Qty:
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<span id="HoverCartSubTotal">
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<tr id="HoverCartPromotionsRow">
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<div class="TextRight HoverCartPromotionsLabel HoverCartSubTotal">Promotions</div>
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<div class="LayoutRight TextRight">
<div class="CheckoutCostDark">
<span id="HoverCartPromotions">
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<tr id="HoverCartShippingRow">
<td>
<div class="TextRight HoverCartShippingLabel HoverCartSubTotal">Estimated shipping</div>
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<td>
<div class="LayoutRight TextRight">
<div class="CheckoutCostDark">
<span id="HoverCartShipping">
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<tr id="HoverCartVATRow">
<td>
<div class="TextRight HoverCartVATLabel HoverCartSubTotal">Tax</div>
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<td>
<div class="LayoutRight TextRight">
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</span>
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<div id="CartTaxHeader">
Calculated at checkout</div>
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<td><div class="RuleH"></div></td>
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<tr>
<td>
<div class="TextRight HoverCartTotalLabel HoverCartSubTotal">Total</div>
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<td>
<div class="LayoutRight TextRight">
<div class="CheckoutCostDark">
<span id="HoverCartTotal">
</span>
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<div class="HoverCart-1-3 LayoutRight LayoutCellTop LayoutBreakAfter">
<a href="/cart.html" id="HoverCartCheckOut" class="CartButtonYellow CartShopCheckOut LayoutRight"><span class="CartBuyIconText">Review and Checkout</span></a>
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</div>
</div>
</div>
</div>
<script>
/*global jQuery,adobe*/
jQuery.createNs("Adobe.Cart.ShoppingCart");
Adobe.Cart.ShoppingCart.HoverCart = {
MaxItems: "4",
DisplayTime: "5000",
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MoreItemsTextPlural: "() more items in your cart",
MonthToMonthText: "per month",
YearlyText: "per year"
};
Adobe.Cart.TaxLabels = {
TaxInclusiveText : "",
TaxNotApplicable : "Tax not applicable"
};
Adobe.Cart.ShoppingCart.GlobalVars = {
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MarketSegment: "COM",
AkamaiURLPrefix: "http://wwwimages.adobe.com/www.adobe.com",
PriceMonthText: "per month",
PriceYearText: "per year",
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SubYearText: "Annual",
SubscriptionItemText: "NONE",
TermTypeMonth: "MONTH",
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BackupDVDParent: "_PARENT",
/*
params: {
cart,
price,
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originalPrice,
storeName,
locale,
usePrecision,
type,
taxCode,
delimiter,
showCentDelim,
distributionMethod
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*/
getPriceLabel: function(params) {
var currency = params.cart.currency;
var params = {
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locale: params.locale,
productKey: params.categoryPath,
priceObject: {
price: {
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priceWithoutTax: params.price,
taxCode: params.taxCode || ""
},
priceTypeKey: params.distributionMethod
},
currencyObject: {
delimiter: params.delimiter || ",",
formatString: currency.FORMATSTRING,
iso3Code: currency.CODE,
symbol: currency.SYMBOL,
usePrecision: params.usePrecision
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type: params.type
};
return params;
},
isSubscription: function(serviceCommitment, termType) {
return (serviceCommitment == this.SubscriptionItemText &&
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},
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return (termType == this.TermTypeMonth &&
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},
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return "";
},
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return this.PriceYearText;
}
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return this.PriceMonthText;
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return "";
}
};
</script>
</div>
<div id="modalContent" style="display:none;"></div>
</div>
<!--googleon: all--></div>
<div class="Link" id="top">
<div class="Link LayoutBreakAfter">
<div class="parbase compbase breadcrumb"><div class="LayoutHeader LayoutBreakAfter Link">
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<div class="LayoutCellSides LinkStrong LayoutH IconAlign">
<span class="LayoutHItem LayoutSmallGutterRight">
<a href="/devnet.html">
Adobe Developer Connection</a>
</span>
<span class="LayoutSmallGutterRight LayoutHItem">/</span>
<span class="LayoutHItem LayoutSmallGutterRight">
<a href="/devnet/flex.html">
Flex Developer Center</a>
</span>
<span class="LayoutSmallGutterRight LayoutHItem">/</span>
</div>
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<div class="LayoutGrid-1-3 LayoutSlimGrid-1-2">
<h1 class="LayoutCellSides LayoutSmallRow TextH1">
Understanding Flex itemEditors – Part 2: Editing events and complex editors</h1>
</div>
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<p>In <a href="/devnet/flex/articles/itemeditors_pt1.html">Part 1</a> of this series you saw how to make some simple inline itemEditors. If you have read <a href="/devnet/flex/articles/itemrenderers_pt1.html">the series on itemRenderers</a>, then you probably noticed how similar the two are.</p>
<p>There are two keys to making an itemEditor work. First, name the class using the <code>itemEditor</code> property. Then, name the value property of the itemEditor using the <code>editorDataField</code> property.</p>
<p>In this article I'll show you how to use events to make more complex itemEditors that do some simple data validation and that can prevent certain cells from being edited.</p>
<p>A word of caution here: by &quot;complex&quot; I do not mean editors with many controls and layouts. I really mean slightly more complex than inline itemEditors. I think it is unfair to ask users to make complex edits within a list or cell of a DataGrid. An editor should be focused only on one thing: the contents of a cell. For example, if you are using a List control and presenting a shopping cart, it is not unreasonable to allow the user to change the quantity of the items in the cart by letting them edit that value right in the cell. What would be unreasonable is allowing them to change the item itself, the colors, special instructions, and so forth. In other words, it doesn't make sense to allow them to shop for items right from the cart when you have a whole site that does that. The cart is just a checkout convenience. Sure, let them add an extra tub of ice cream or delete a bag of chips, but don't have them turn the bag of chips into two boxes of whole wheat pasta.</p>
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<h3>The itemEditEnd event</h3>
<p>Let's say your application has a DataGrid to help manage inventory. With it, users can change part numbers, but you don't want to allow them to leave the part number empty. If you use the default itemEditor, the TextInput control, a user can click on a cell in the &quot;Part #&quot; column, press the delete key and erase the part number. Here is some code that implements one technique to prevent that.</p>
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<code class="CodeBlock"> &lt;mx:DataGrid x=&#034;10&#034; y=&#034;64&#034; editable=&#034;true&#034; dataProvider=&#034;{inventoryDB}&#034;
itemEditEnd=&#034;verifyInput(event)&#034;&gt;
&lt;mx:columns&gt;
&lt;mx:DataGridColumn headerText=&#034;Product&#034; dataField=&#034;product&#034;/&gt;
&lt;mx:DataGridColumn headerText=&#034;Part #&#034; dataField=&#034;part&#034;/&gt;
&lt;mx:DataGridColumn headerText=&#034;Type&#034; dataField=&#034;type&#034;
itemEditor=&#034;editors.ProductTypeEditor&#034; editorDataField=&#034;type&#034;/&gt;
&lt;mx:DataGridColumn headerText=&#034;Quantity&#034; dataField=&#034;quantity&#034;/&gt;
&lt;/mx:columns&gt;
&lt;/mx:DataGrid&gt;</code>
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<p>List controls dispatch an <code>itemEditEnd</code> event whenever editing is <i><span>about</span></i><span> to be completed. The event happens before the data is committed back to the dataProvider. By handling this event you can change the data, or you can validate the data and stop the commit if necessary. In this example, the </span><code>verifyInput()</code> function makes sure the product part number is not empty.</p>
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<code class="CodeBlock"> private function verifyInput( event:DataGridEvent ) : void
{
// it is OK if the user cancels the edit
if( event.reason == DataGridEventReason.CANCELLED ) return;
// grab the instance of the itemEditor. For this DataGrid, only the
// TextInput control is used as the editor, so it is safe to get the
// editor no matter what column has been edited.
var editor:TextInput = (event.currentTarget as DataGrid).itemEditorInstance as TextInput;
// if the edit is on the part number column, make sure it is not blank
if( event.dataField == &#034;part&#034; )
{
if( editor.text.length == 0 ) {
// call event.preventDefault() so the edit will not continue and store the
// blank value
event.preventDefault();
// give the editor an error to display to the user
editor.errorString = &#034;You must enter a part number&#034;;
return;
}
}
// handle other columns here
}</code>
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<p>The event is an instance of the DataGridEvent class and contains some very useful properties. The <code>reason</code> property tells you why the event was dispatched. If the user pressed the ESCAPE key or clicked outside of the DataGrid the reason will be DataGridEventReason.CANCELLED. You may want to ignore this event as I have done and just let the DataGrid perform its default action, which is to cancel the edit and restore the previous value. </p>
<p>If you decide to handle the event then you will need the itemEditor to access its properties. The event's <code>currentTarget</code> property contains the control, which I have cast to DataGrid. The DataGrid has an <code>itemEditorInstance</code> property which I cast to TextInput which is the type of itemEditor for this example. </p>
<p>Because this event handler is called for any cell, you must determine if the edit is something you are interested in verifying. I check the event's <code>dataField</code> property to make sure the cell is in the &quot;part&quot; column. If so, I test the editor's <code>text</code> property to see if there are any characters in it. If there are no characters, two things happen.</p>
<p>First, <code>event.preventDefault()</code> is called. This is how I prevent the edit from happening and prevent the DataGrid from storing the new value back into the dataProvider. From the user's perspective, nothing will appear to have happened after they press TAB or ENTER. The <code>preventDefault()</code> function will keep the itemEditor in place. </p>
<p>Second, I put an errorString onto the TextInput control. This is optional, but it does signal the user that there is something wrong. After all, nothing happened when they pressed the TAB or ENTER key and it is a good practice to provide a reason.</p>
<h3>The itemEditBeginning event</h3>
<p>There are times when you might want to prevent a cell from being edited. You could set the DataGridColumn's editable property to false, but that prevents every cell from being edited. Suppose you just want to make <i><span>some</span></i><span> of the cells in the column uneditable? You can specify whether a cell is editable or not using the </span><code>itemEditBeginning</code> event.</p>
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<code class="CodeBlock"> &lt;mx:DataGrid x=&#034;10&#034; y=&#034;64&#034; editable=&#034;true&#034; dataProvider=&#034;{inventoryDB}&#034;
itemEditEnd=&#034;verifyInput(event)&#034;
itemEditBeginning=&#034;allowForEdit(event)&#034;&gt;
&lt;mx:columns&gt;
&lt;mx:DataGridColumn headerText=&#034;Product&#034; dataField=&#034;product&#034;/&gt;
&lt;mx:DataGridColumn headerText=&#034;Part #&#034; dataField=&#034;part&#034;/&gt;
&lt;mx:DataGridColumn headerText=&#034;Type&#034; dataField=&#034;type&#034;
itemEditor=&#034;editors.ProductTypeEditor&#034; editorDataField=&#034;type&#034;/&gt;
&lt;mx:DataGridColumn headerText=&#034;Quantity&#034; dataField=&#034;quantity&#034;/&gt;
&lt;/mx:columns&gt;
&lt;/mx:DataGrid&gt;</code>
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<p>By handling the <code>itemEditBeginning</code> event you can dynamically decide the editability of a cell. In this example, the data has a field called <code>permanent</code> on each record. The idea is that <code>permanent=true</code> means the product name is an unchangeable value so the product cell for that row cannot be edited. This is handled by the <code>allowForEdit()</code> function:</p>
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<code class="CodeBlock"> private function allowForEdit(event:DataGridEvent) : void
{
// if the field to be edited is a product, prevent the user from making
// changes if the permanent flag is true&lt;. You can use more complex logic,
// of course.
if( event.dataField == &#034;product&#034; ) {
var item:Object = ((event.currentTarget as DataGrid).dataProvider as ArrayCollection)[event.rowIndex];
if( item.permanent ) {
event.preventDefault();
}
}
// handle other columns here
}</code>
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<a name="articlecontentAdobe_text_4" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
<p>Again, the event is an instance of the DataGridEvent class and here I have checked the <code>dataField</code> property of the event to make sure it is the &quot;product&quot; field I am dealing with. I can then get the record from the dataProvider of the DataGrid using the <code>currentTarget</code> property of the event and cast that to DataGrid. I then cast the DataGrid's dataProvider to ArrayCollection and get the <code>event.rowIndex</code> value. I could also have accessed the <code>inventoryDB</code> ArrayCollection directly in this function since they are in the same file, but this is a more generic approach.</p>
<p>Once I have the record I can query its permanent property and if it is true, call the <code>event.preventDefault()</code> function to disable editing of that cell. In this case, the default behavior of <code>itemEditBeginning</code> is to present the itemEditor; preventing the default behavior makes the cell uneditable.</p>
<h3>Editing limitations</h3>
<p>It is important to realize that there are some limitations to consider when handling edit events. When you are using edit events to determine if the event should proceed, you may be tempted to make a call to a backend or server process. For example, you may have a web service that can validate a part number. In this case you may try, while inside of the <code>itemEditEnd</code> event, to make a web service call and validate what the user just entered. Seems logical, right?</p>
<p>Logical maybe, but it won't work because service calls are asynchronous. You can certainly make the call, but the result will be returned some time later—well after your event handler has exited. In fact, your call won't actually be made until your function exits. Your call is queued and when the Flex framework exits the function, the request will be made and then the result will be returned by your web service's result handler.</p>
<p>So there is no way to do this type of server-side validation while editing cells. If you want to perform this kind of validation, then when your application starts you should query the server for the data to validate against, and use that while the cells are being edited.</p>
<h3>Where to go from here</h3>
<p>The ability to dynamically allow editing and to validate the change is an excellent way to improve your application's user experience. You can help your users make fewer mistakes and give feedback during the editing process. You can prevent them from editing certain data and simplify application development since you do not have to validate what the user cannot change.</p>
<p>In <a href="/devnet/flex/articles/itemeditors_pt3.html">Part 3</a> of this series I'll cover itemRenderers used as itemEditors.</p>
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This work is licensed under a <a href="http://creativecommons.org/licenses/by-nc-sa/3.0/" rel="license" target="_blank">Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License</a></p>
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