| <html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>var</title><link rel="stylesheet" type="text/css" href="rivet.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="index.html" title="Apache Rivet 3.0"><link rel="up" href="commands.html" title="Rivet Tcl Commands and Variables"><link rel="prev" href="url_script.html" title="url_script"><link rel="next" href="wrap.html" title="wrap"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">var</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="url_script.html"><img src="images/prev.png" alt="Prev"></a> </td><th width="60%" align="center">Rivet Tcl Commands and Variables</th><td width="20%" align="right"> <a accesskey="n" href="wrap.html"><img src="images/next.png" alt="Next"></a></td></tr></table></div><div class="refentry"><div class="refentry.separator"><hr></div><a name="var"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>var, var_qs, var_post — get the value of a form variable.</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis" style="width:80%"><div style="border: 1px solid #282; margin:1ex ; padding:.4ex; padding-left: 0.8ex; word-spacing:1ex "><span style="font-weight:bold ; font-family:monospace">::rivet::var</span> (<span style="font-family:monospace; font-weight: bold;">get</span> | <span style="font-family:monospace; font-weight: bold;">list</span> | <span style="font-family:monospace; font-weight: bold;">exists</span> | <span style="font-family:monospace; font-weight: bold;">number</span> | <span style="font-family:monospace; font-weight: bold;">all</span>)</div></div><div class="cmdsynopsis" style="width:80%"><div style="border: 1px solid #282; margin:1ex ; padding:.4ex; padding-left: 0.8ex; word-spacing:1ex "><span style="font-weight:bold ; font-family:monospace">::rivet::var_qs</span> (<span style="font-family:monospace; font-weight: bold;">get</span> | <span style="font-family:monospace; font-weight: bold;">list</span> | <span style="font-family:monospace; font-weight: bold;">exists</span> | <span style="font-family:monospace; font-weight: bold;">number</span> | <span style="font-family:monospace; font-weight: bold;">all</span>)</div></div><div class="cmdsynopsis" style="width:80%"><div style="border: 1px solid #282; margin:1ex ; padding:.4ex; padding-left: 0.8ex; word-spacing:1ex "><span style="font-weight:bold ; font-family:monospace">::rivet::var_post</span> (<span style="font-family:monospace; font-weight: bold;">get</span> | <span style="font-family:monospace; font-weight: bold;">list</span> | <span style="font-family:monospace; font-weight: bold;">exists</span> | <span style="font-family:monospace; font-weight: bold;">number</span> | <span style="font-family:monospace; font-weight: bold;">all</span>)</div></div></div><div class="refsect1"><a name="idm1800"></a><h2>Description</h2><p style="width:90%"> |
| The <span style="font-family:monospace"><span class="command"><strong>var</strong></span></span> command retrieves information |
| about GET or POST variables sent to the script via client |
| request. It treats both GET and POST variables the same, |
| regardless of their origin. Note that there are two |
| additional forms of <span style="font-family:monospace"><span class="command"><strong>::rivet::var</strong></span></span>: |
| <span style="font-family:monospace"><span class="command"><strong>rivet::var_qs</strong></span></span> and |
| <span style="font-family:monospace"><span class="command"><strong>::rivet::var_post</strong></span></span>. |
| These two restrict the retrieval of information to |
| parameters arriving via the querystring |
| (?foo=bar&bee=bop) or POSTing, respectively. |
| </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> |
| <div class="cmdsynopsis" style="width:80%"><div style="border: 1px solid #282; margin:1ex ; padding:.4ex; padding-left: 0.8ex; word-spacing:1ex "><span style="font-weight:bold ; font-family:monospace">::rivet::var</span> <span style="font-family:monospace; font-weight: bold;">get</span> ?<span style="font-family:monospace; font-weight: bold;"><em class="replaceable"><code>varname</code></em></span>? ?<span style="font-family:monospace; font-weight: bold;"><em class="replaceable"><code>?<span class="optional">default</span>?</code></em></span>?</div></div> |
| </span></dt><dd><div style="padding:4 ; margin-top:3 ; margin-bottom:3 ; width:75%"><div style="margin-bottom:1.5ex ; padding .5ex"> |
| Returns the value of variable |
| <em class="replaceable"><code>varname</code></em> |
| as a string (even if there are multiple values). If |
| the variable doesn't exist as a GET or POST |
| variable, the |
| <em class="replaceable"><code>?<span class="optional">default</span>?</code></em> |
| value is returned, otherwise "" - an empty string - |
| is returned. |
| </div></div></dd><dt><span class="term"> |
| <div class="cmdsynopsis" style="width:80%"><div style="border: 1px solid #282; margin:1ex ; padding:.4ex; padding-left: 0.8ex; word-spacing:1ex "><span style="font-weight:bold ; font-family:monospace">::rivet::var</span> <span style="font-family:monospace; font-weight: bold;">list</span> ?<span style="font-family:monospace; font-weight: bold;"><em class="replaceable"><code>varname</code></em></span>?</div></div> |
| </span></dt><dd><div style="padding:4 ; margin-top:3 ; margin-bottom:3 ; width:75%"><div style="margin-bottom:1.5ex ; padding .5ex"> |
| Returns the value of variable |
| <em class="replaceable"><code>varname</code></em> as a list, |
| one list element per reference. Radiobuttons or multiple |
| selection listboxes are suited widgets which may |
| return list data. |
| </div><div style="margin-bottom:1.5ex ; padding .5ex"> |
| If the result list is passed as a default value to the form package, one |
| could also set index "__varname" to get it interpreted as a list. |
| </div><pre class="programlisting">set response(countries) [::rivet::var list countries] |
| set response(__countries) "" |
| form form_request -defaults response |
| form_request select countries -multiple 1 -values {USA Canada Mexico} |
| form_request end</pre></div></dd><dt><span class="term"> |
| <div class="cmdsynopsis" style="width:80%"><div style="border: 1px solid #282; margin:1ex ; padding:.4ex; padding-left: 0.8ex; word-spacing:1ex "><span style="font-weight:bold ; font-family:monospace">::rivet::var</span> <span style="font-family:monospace; font-weight: bold;">exists</span> ?<span style="font-family:monospace; font-weight: bold;"><em class="replaceable"><code>varname</code></em></span>?</div></div> |
| </span></dt><dd><div style="padding:4 ; margin-top:3 ; margin-bottom:3 ; width:75%"><div style="margin-bottom:1.5ex ; padding .5ex"> |
| Returns 1 if |
| <em class="replaceable"><code>varname</code></em> |
| exists, 0 if it doesn't. |
| </div></div></dd><dt><span class="term"> |
| <div class="cmdsynopsis" style="width:80%"><div style="border: 1px solid #282; margin:1ex ; padding:.4ex; padding-left: 0.8ex; word-spacing:1ex "><span style="font-weight:bold ; font-family:monospace">::rivet::var</span> <span style="font-family:monospace; font-weight: bold;">number</span> </div></div> |
| </span></dt><dd><div style="padding:4 ; margin-top:3 ; margin-bottom:3 ; width:75%"><div style="margin-bottom:1.5ex ; padding .5ex"> |
| Returns the number of variables. |
| </div></div></dd><dt><span class="term"> |
| <div class="cmdsynopsis" style="width:80%"><div style="border: 1px solid #282; margin:1ex ; padding:.4ex; padding-left: 0.8ex; word-spacing:1ex "><span style="font-weight:bold ; font-family:monospace">::rivet::var</span> <span style="font-family:monospace; font-weight: bold;">all</span> </div></div> |
| </span></dt><dd><div style="padding:4 ; margin-top:3 ; margin-bottom:3 ; width:75%"><div style="margin-bottom:1.5ex ; padding .5ex"> |
| Return a list of variable names and values. |
| </div></div></dd></dl></div><p style="width:90%">See <a class="xref" href="examples.html#variable_access" title="Example 3. Variable Access">Example 3, “Variable Access”</a>.</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="url_script.html"><img src="images/prev.png" alt="Prev"></a> </td><td width="20%" align="center"><a accesskey="u" href="commands.html"><img src="images/up.png" alt="Up"></a></td><td width="40%" align="right"> <a accesskey="n" href="wrap.html"><img src="images/next.png" alt="Next"></a></td></tr><tr><td width="40%" align="left" valign="top">url_script </td><td width="20%" align="center"><a accesskey="h" href="index.html"><img src="images/home.png" alt="Home"></a></td><td width="40%" align="right" valign="top"> wrap</td></tr></table></div></body></html> |
