legacy-tests/build/test/1/dgui_template_valueinsertion.html - freemarker-docgen - Git at Google

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 <div class="col-right"><div class="page-content"><div class="page-title"><div class="pagers top"><a class="paging-arrow previous" href="dgui_template_exp.html"><span>Previous</span></a><a class="paging-arrow next" href="dgui_misc.html"><span>Next</span></a></div><div class="title-wrapper">
 <h1 class="content-header header-section1" id="dgui_template_valueinsertion" itemprop="headline">Interpolations</h1>
 </div></div><p>The format of interpolations is
         <code class="inline-code">${<em class="code-color">expression</em>}</code>, where
         <code class="inline-code"><em class="code-color">expression</em></code> can be all
         kind of expression (e.g. <code class="inline-code">${100 + x}</code>).</p><p>The interpolation is used to insert the value of the
         <code class="inline-code"><em class="code-color">expression</em></code> converted to
         text (to string). Interpolations can be used only on two places: in
         <a href="dgui_template_overallstructure.html"><span class="marked-text">text</span> sections</a> (e.g.,
         <code class="inline-code">&lt;h1&gt;Hello ${name}!&lt;/h1&gt;</code>) and <a href="dgui_template_exp.html#dgui_template_exp_stringop_interpolation">in string literal
         expressions</a> (e.g., <code class="inline-code">[#include
         &quot;/footer/${company}.html&quot;]</code>).</p>  <div class="callout warning">
     <strong class="callout-label">Warning!</strong>

           <p>A frequent mistake is the usage of interpolations in places
           where it shouldn&#39;t/can&#39;t be used. A typical bad usage is
           <code class="inline-code">[#if ${isBig}]Wow![/#if]</code>, which is syntactically
           <em>WRONG</em>. You should simply write <code class="inline-code">[#if
           isBig]Wow![/#if]</code>. Also, <code class="inline-code">[#if
           &quot;${isBig}&quot;]Wow![/#if]</code> is <em>WRONG</em>, since
           the parameter value will be a string, and the <code class="inline-code">if</code>
           directive wants a boolean value, so it will cause a runtime
           error.</p>
           </div>
 <p>The result of the expression must be a string, number or date
         value. This is because only numbers and dates will be converted to
         string by the interpolation automatically, other types of values (such
         as booleans, sequences) must be converted to string &quot;manually&quot; somehow
         (see some advices later), or an error will stop the template
         processing.</p><p>If the interpolation is in a <a href="dgui_template_overallstructure.html"><span class="marked-text">text</span> section</a> (i.e., not in a <a href="dgui_template_exp.html#dgui_template_exp_stringop_interpolation">string literal
         expression</a>), the string that it will insert will be
         automatically escaped if an <a href="ref_directive_escape.html#ref.directive.escape"><code>escape</code>
         directive</a> is in effect.</p>


 <h2 class="content-header header-simplesect" id="autoid_18">Guide for inserting numerical values</h2>


           <p>If the expression evaluates to a number then the numerical
           value will be converted to string according the default number
           format. This may includes the maximum number of decimals, grouping,
           and like. Usually the programmer should set the default number
           format; the template author don&#39;t have to deal with it (but he can
           with the <code class="inline-code">number_format</code> setting; see in the <a href="ref_directive_setting.html">documentation of
           <code>setting</code> directive</a>). You can override the
           default number format for a single interpolation with the <a href="ref_builtins_number.html#ref_builtin_string_for_number"><code>string</code>
           built-in</a>.</p>

           <p>The decimal separator used (and other such symbols, like the
           group separator) depends on the current locale (language, country),
           that also should be set by the programmer. For example, this
           template:</p>


 <div class="code-wrapper"><pre class="code-block code-template">${1.5}</pre></div>

           <p>will print something like this if the current locale is
           English:</p>


 <div class="code-wrapper"><pre class="code-block code-output">1.5</pre></div>

           <p>but if the current locale is Hungarian then it will print
           something like:</p>


 <div class="code-wrapper"><pre class="code-block code-output">1,5</pre></div>

           <p>since Hungarian people use comma as decimal separator.</p>

           <p>You can modify the formatting for a single interpolation with
           the <a href="ref_builtins_number.html#ref_builtin_string_for_number"><code>string</code>
           built-in</a>.</p>

             <div class="callout warning">
     <strong class="callout-label">Warning!</strong>

             <p>As you can see, interpolations print for human audience (by
             default at least), as opposed to &#39;&#39;computer audience&#39;&#39;. In some
             cases this is not good, like when you print a database record ID-s
             as the part of an URL or as an invisible field value in a HTML
             form, or when you print CSS/JavaScript numerical literals, because
             these printed values will be read by computer programs and not by
             humans. Most computer programs are very particular about the
             format of the numbers, and understand only a kind of simple US
             number formatting. For that, use the <a href="ref_builtins_number.html#ref_builtin_c"><code>c</code></a> (stands for
             &#39;&#39;computer audience&#39;&#39;) built-in, for example:</p>


 <div class="code-wrapper"><pre class="code-block code-template">&lt;a href=&quot;/shop/productdetails?id=${product.id?c}&quot;&gt;Details...&lt;/a&gt;</pre></div>
             </div>


 <h2 class="content-header header-simplesect" id="dgui_template_valueinserion_universal_date">Guide for inserting date/time values</h2>


           <p>If the expression evaluates to a date then the numerical value
           will be transformed to a text according to a default format. Usually
           the programmer should set the default format; you don&#39;t have to deal
           with it (but if you care, see the <code class="inline-code">date_format</code>,
           <code class="inline-code">time_format</code> and
           <code class="inline-code">datetime_format</code> settings in the <a href="ref_directive_setting.html">documentation of the
           <code>setting</code> directive</a>).</p>

           <p>You can override the default formatting for a single
           interpolation with the <a href="ref_builtins_date.html#ref_builtin_string_for_date"><code>string</code>
           built-in</a>.</p>

             <div class="callout warning">
     <strong class="callout-label">Warning!</strong>

             <p>To display a date as text, FreeMarker must know which parts
             of the date are in use, that is, if only the date part (year,
             month, day), or only the time part (hour, minute, second,
             millisecond), or both. Unfortunately, because of the technical
             limitations of Java platform, for some variables it is not
             possible to detect this automatically; ask the programmer if the
             data-model contains such problematic variables. If it is not
             possible to find out which parts of the date are in use, then you
             must help FreeMarker with the <a href="ref_builtins_date.html#ref_builtin_date_datetype"><code>date</code>,
             <code>time</code> and <code>datetime</code></a>
             built-ins, or it will stop with error.</p>
             </div>


 <h2 class="content-header header-simplesect" id="autoid_19">Guide for inserting boolean values</h2>


           <p>An attempt to print boolean values with interpolation causes
           an error and aborts template processing. For example this will cause
           an error: <code class="inline-code">${a == 2}</code> and will not print &#39;&#39;true&#39;&#39;
           or something like that.</p>

           <p>However, you can convert booleans to strings with the <a href="ref_builtins_boolean.html#ref_builtin_string_for_boolean"><code>?string</code>
           built-in</a>. For example, to print the value of the &quot;married&quot;
           variable (assuming it&#39;s a boolean), you could write
           <code class="inline-code">${married?string(&quot;yes&quot;, &quot;no&quot;)}</code>.</p>


 <h2 class="content-header header-simplesect" id="autoid_20">The exact conversion rules</h2>


           <p>For those who are interested, the exact rules of conversion
           from the expression value to string (that is then still subject to
           escaping) are these, in in this order:</p>

           <div class="orderedlist"><ol type="1">
             <li>
               <p>If the value is a number, then it is converted to string
               in the format specified with the
               <code class="inline-code">number_format</code> setting. So this usually
               formats for human audience, as opposed to computer
               audience.</p>
             </li>

             <li>
               <p>Else if the value is whatever kind of date, time or
               date-time, then it is converted to string in the format
               specified with the <code class="inline-code">time_format</code>,
               <code class="inline-code">date_format</code>, or
               <code class="inline-code">datetime_format</code> setting, depending on whether
               the date information is time-only, date-only, or a date-time. If
               it can&#39;t be detected what kind of date it is (date vs time vs
               date-time), an error will occur.</p>
             </li>

             <li>
               <p>Else if the value is a string, then there is no
               conversion.</p>
             </li>

             <li>
               <p>Else if the engine is in classic compatibility
               mode:</p>

               <div class="orderedlist"><ol type="1">
                 <li>
                   <p>If the value is a boolean, true values are converted
                   to &quot;true&quot;, false values are converted to an empty
                   string.</p>
                 </li>

                 <li>
                   <p>If the expression is undefined
                   (<code class="inline-code">null</code> or a variable is undefined), it is
                   converted to an empty string.</p>
                 </li>

                 <li>
                   <p>Else an error will abort the template
                   processing.</p>
                 </li>
               </ol></div>
             </li>

             <li>
               <p>Else an error will abort the template processing.</p>
             </li>
           </ol></div>
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	<div class="col-right"><div class="page-content"><div class="page-title"><div class="pagers top"><a class="paging-arrow previous" href="dgui_template_exp.html"><span>Previous</span></a><a class="paging-arrow next" href="dgui_misc.html"><span>Next</span></a></div><div class="title-wrapper">
	<h1 class="content-header header-section1" id="dgui_template_valueinsertion" itemprop="headline">Interpolations</h1>
	</div></div><p>The format of interpolations is
	<code class="inline-code">${<em class="code-color">expression</em>}</code>, where
	<code class="inline-code"><em class="code-color">expression</em></code> can be all
	kind of expression (e.g. <code class="inline-code">${100 + x}</code>).</p><p>The interpolation is used to insert the value of the
	<code class="inline-code"><em class="code-color">expression</em></code> converted to
	text (to string). Interpolations can be used only on two places: in
	<a href="dgui_template_overallstructure.html"><span class="marked-text">text</span> sections</a> (e.g.,
	<code class="inline-code"><h1>Hello ${name}!</h1></code>) and <a href="dgui_template_exp.html#dgui_template_exp_stringop_interpolation">in string literal
	expressions</a> (e.g., <code class="inline-code">[#include
	"/footer/${company}.html"]</code>).</p> <div class="callout warning">
	<strong class="callout-label">Warning!</strong>

	<p>A frequent mistake is the usage of interpolations in places
	where it shouldn't/can't be used. A typical bad usage is
	<code class="inline-code">[#if ${isBig}]Wow![/#if]</code>, which is syntactically
	<em>WRONG</em>. You should simply write <code class="inline-code">[#if
	isBig]Wow![/#if]</code>. Also, <code class="inline-code">[#if
	"${isBig}"]Wow![/#if]</code> is <em>WRONG</em>, since
	the parameter value will be a string, and the <code class="inline-code">if</code>
	directive wants a boolean value, so it will cause a runtime
	error.</p>
	</div>
	<p>The result of the expression must be a string, number or date
	value. This is because only numbers and dates will be converted to
	string by the interpolation automatically, other types of values (such
	as booleans, sequences) must be converted to string "manually" somehow
	(see some advices later), or an error will stop the template
	processing.</p><p>If the interpolation is in a <a href="dgui_template_overallstructure.html"><span class="marked-text">text</span> section</a> (i.e., not in a <a href="dgui_template_exp.html#dgui_template_exp_stringop_interpolation">string literal
	expression</a>), the string that it will insert will be
	automatically escaped if an <a href="ref_directive_escape.html#ref.directive.escape"><code>escape</code>
	directive</a> is in effect.</p>




	<h2 class="content-header header-simplesect" id="autoid_18">Guide for inserting numerical values</h2>


	<p>If the expression evaluates to a number then the numerical
	value will be converted to string according the default number
	format. This may includes the maximum number of decimals, grouping,
	and like. Usually the programmer should set the default number
	format; the template author don't have to deal with it (but he can
	with the <code class="inline-code">number_format</code> setting; see in the <a href="ref_directive_setting.html">documentation of
	<code>setting</code> directive</a>). You can override the
	default number format for a single interpolation with the <a href="ref_builtins_number.html#ref_builtin_string_for_number"><code>string</code>
	built-in</a>.</p>

	<p>The decimal separator used (and other such symbols, like the
	group separator) depends on the current locale (language, country),
	that also should be set by the programmer. For example, this
	template:</p>



	<div class="code-wrapper"><pre class="code-block code-template">${1.5}</pre></div>

	<p>will print something like this if the current locale is
	English:</p>



	<div class="code-wrapper"><pre class="code-block code-output">1.5</pre></div>

	<p>but if the current locale is Hungarian then it will print
	something like:</p>



	<div class="code-wrapper"><pre class="code-block code-output">1,5</pre></div>

	<p>since Hungarian people use comma as decimal separator.</p>

	<p>You can modify the formatting for a single interpolation with
	the <a href="ref_builtins_number.html#ref_builtin_string_for_number"><code>string</code>
	built-in</a>.</p>

	<div class="callout warning">
	<strong class="callout-label">Warning!</strong>

	<p>As you can see, interpolations print for human audience (by
	default at least), as opposed to ''computer audience''. In some
	cases this is not good, like when you print a database record ID-s
	as the part of an URL or as an invisible field value in a HTML
	form, or when you print CSS/JavaScript numerical literals, because
	these printed values will be read by computer programs and not by
	humans. Most computer programs are very particular about the
	format of the numbers, and understand only a kind of simple US
	number formatting. For that, use the <a href="ref_builtins_number.html#ref_builtin_c"><code>c</code></a> (stands for
	''computer audience'') built-in, for example:</p>



	<div class="code-wrapper"><pre class="code-block code-template"><a href="/shop/productdetails?id=${product.id?c}">Details...</a></pre></div>
	</div>






	<h2 class="content-header header-simplesect" id="dgui_template_valueinserion_universal_date">Guide for inserting date/time values</h2>


	<p>If the expression evaluates to a date then the numerical value
	will be transformed to a text according to a default format. Usually
	the programmer should set the default format; you don't have to deal
	with it (but if you care, see the <code class="inline-code">date_format</code>,
	<code class="inline-code">time_format</code> and
	<code class="inline-code">datetime_format</code> settings in the <a href="ref_directive_setting.html">documentation of the
	<code>setting</code> directive</a>).</p>

	<p>You can override the default formatting for a single
	interpolation with the <a href="ref_builtins_date.html#ref_builtin_string_for_date"><code>string</code>
	built-in</a>.</p>

	<div class="callout warning">
	<strong class="callout-label">Warning!</strong>

	<p>To display a date as text, FreeMarker must know which parts
	of the date are in use, that is, if only the date part (year,
	month, day), or only the time part (hour, minute, second,
	millisecond), or both. Unfortunately, because of the technical
	limitations of Java platform, for some variables it is not
	possible to detect this automatically; ask the programmer if the
	data-model contains such problematic variables. If it is not
	possible to find out which parts of the date are in use, then you
	must help FreeMarker with the <a href="ref_builtins_date.html#ref_builtin_date_datetype"><code>date</code>,
	<code>time</code> and <code>datetime</code></a>
	built-ins, or it will stop with error.</p>
	</div>






	<h2 class="content-header header-simplesect" id="autoid_19">Guide for inserting boolean values</h2>


	<p>An attempt to print boolean values with interpolation causes
	an error and aborts template processing. For example this will cause
	an error: <code class="inline-code">${a == 2}</code> and will not print ''true''
	or something like that.</p>

	<p>However, you can convert booleans to strings with the <a href="ref_builtins_boolean.html#ref_builtin_string_for_boolean"><code>?string</code>
	built-in</a>. For example, to print the value of the "married"
	variable (assuming it's a boolean), you could write
	<code class="inline-code">${married?string("yes", "no")}</code>.</p>





	<h2 class="content-header header-simplesect" id="autoid_20">The exact conversion rules</h2>


	<p>For those who are interested, the exact rules of conversion
	from the expression value to string (that is then still subject to
	escaping) are these, in in this order:</p>

	<div class="orderedlist"><ol type="1">
	<li>
	<p>If the value is a number, then it is converted to string
	in the format specified with the
	<code class="inline-code">number_format</code> setting. So this usually
	formats for human audience, as opposed to computer
	audience.</p>
	</li>

	<li>
	<p>Else if the value is whatever kind of date, time or
	date-time, then it is converted to string in the format
	specified with the <code class="inline-code">time_format</code>,
	<code class="inline-code">date_format</code>, or
	<code class="inline-code">datetime_format</code> setting, depending on whether
	the date information is time-only, date-only, or a date-time. If
	it can't be detected what kind of date it is (date vs time vs
	date-time), an error will occur.</p>
	</li>

	<li>
	<p>Else if the value is a string, then there is no
	conversion.</p>
	</li>

	<li>
	<p>Else if the engine is in classic compatibility
	mode:</p>

	<div class="orderedlist"><ol type="1">
	<li>
	<p>If the value is a boolean, true values are converted
	to "true", false values are converted to an empty
	string.</p>
	</li>

	<li>
	<p>If the expression is undefined
	(<code class="inline-code">null</code> or a variable is undefined), it is
	converted to an empty string.</p>
	</li>

	<li>
	<p>Else an error will abort the template
	processing.</p>
	</li>
	</ol></div>
	</li>

	<li>
	<p>Else an error will abort the template processing.</p>
	</li>
	</ol></div>
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