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POHow to use Dropdown Extender to trigger OnSelectedIndexChanged event
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  1. POHow to use Dropdown Extender to trigger OnSelectedIndexChanged event
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    copied!<p>I am trying to construct a Dropdown list using the AjaxToolKit's dropdownlistextender. I have the following markup:</p> <pre><code>&lt;asp:Label ID="ddTest" runat="server" Text="Transactions" Width="300px" BorderColor="#C0C0C0" CssClass="selecter"/&gt; &lt;ajaxToolkit:DropDownExtender runat="server" ID="ddeSections" TargetControlID="ddTest" DropDownControlID="panelItems" HighlightBackColor="Silver" DropArrowBackColor="white" HighlightBorderColor="Silver"/&gt; </code></pre> <p>and the following for the "list" items:</p> <pre><code> &lt;table runat="server" id="ctlOptions" class="options" cellspacing="2" cellpadding="2" border="1"&gt; &lt;tr&gt;&lt;td class="item" onmouseover="mouseOver(this)" onmouseout="mouseOut(this)" onclick="clickIt(this)"&gt;Transactions&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt;&lt;td class="item" onmouseover="mouseOver(this)" onmouseout="mouseOut(this)" onclick="clickIt(this)"&gt;The second option&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt;&lt;td class="item" onmouseover="mouseOver(this)" onmouseout="mouseOut(this)" onclick="clickIt(this)"&gt;The third option&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt;&lt;td class="item" onmouseover="mouseOver(this)" onmouseout="mouseOut(this)" onclick="clickIt(this)"&gt;The fourth option&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt;&lt;td class="item" onmouseover="mouseOver(this)" onmouseout="mouseOut(this)" onclick="clickIt(this)"&gt;The fifth option&lt;/td&gt;&lt;/tr&gt; &lt;/table&gt; </code></pre> <p>my JavaScript looks like this:</p> <pre><code>function mouseOver(obj) { if (obj) obj.className = 'itemOver'; } function mouseOut(obj) { if (obj) obj.className = 'item'; } </code></pre> <p>where <strong>item</strong> and <strong>itemOver</strong> are appropriately styled CSS classes. The problem is that I want my <em>onclick</em> event to trigger a <em>SelectedIndexChanged</em>-type event on the server. I have tried with this function:</p> <pre><code>function clickIt(obj) { var ddTest = document.getElementById("ctl00_ContentPlaceHolder1_ddTest"); var selVal = ''; if (ddTest) { selVal = obj.firstChild.nodeValue; ddTest.firstChild.nodeValue = selVal; __doPostBack('&lt;%=ddSections.ClientID %&gt;', ''); } } </code></pre> <p><em>ddSections</em> is an <code>asp:Dropdown</code> whose OnSelectedIndexChanged event I am attempting to fire.</p> <p>This triggers a page-level postback, but not the <strong>ddSections_SelectedIndexChanged</strong> server-side method that I want to trigger. The ddSections, incidentally, will be hidden.</p> <p>please can you offer some advice. I have spent three days trying to figure this out and have come up empty handed. Feel free to re-format for readability. Thanks in advance.</p>
 

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