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POhow to check form after postback
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  1. POhow to check form after postback
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    copied!<p>Please cosider this scenario:</p> <p>I have a form with 3 drop down list.I place these controls in an <code>update panel</code>.when my users select an Item with value greater that 2 in first drop down list I disable second and third drop down list with jQuery. My problem is after any post back all drop down list are enable.I know this is normal but how I can check the form again and disable controls that should be disable?</p> <h2>thanks</h2> <p><strong>Edit 1)</strong></p> <p>this is my code:</p> <pre><code>&lt;asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"&gt; &lt;ContentTemplate&gt; &lt;table border="1" cellpadding="0" cellspacing="0"&gt; &lt;tr&gt; &lt;td&gt; &lt;asp:DropDownList ID="DropDownList1" runat="server" Width="100px"&gt; &lt;asp:ListItem Value="1" Text="1" /&gt; &lt;asp:ListItem Value="2" Text="2" /&gt; &lt;asp:ListItem Value="3" Text="3" /&gt; &lt;/asp:DropDownList&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; &lt;asp:DropDownList ID="DropDownList2" runat="server" Width="100px"&gt; &lt;asp:ListItem Value="1" Text="1" /&gt; &lt;asp:ListItem Value="2" Text="2" /&gt; &lt;asp:ListItem Value="3" Text="3" /&gt; &lt;/asp:DropDownList&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; &lt;asp:DropDownList ID="DropDownList3" runat="server" Width="100px"&gt; &lt;asp:ListItem Value="1" Text="1" /&gt; &lt;asp:ListItem Value="2" Text="2" /&gt; &lt;asp:ListItem Value="3" Text="3" /&gt; &lt;/asp:DropDownList&gt; &lt;br /&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;div&gt; &lt;asp:Button ID="Button1" runat="server" Text="Cause Post Back" Width="200px" onclick="Button1_Click"/&gt; &lt;/div&gt; &lt;/ContentTemplate&gt; &lt;/asp:UpdatePanel&gt; </code></pre> <p>and javascript:</p> <pre><code> $(document).ready(function () { function Disable(item) { item.attr('disabled', 'disabled'); } $('#DropDownList1').change(function () { if ($(this).val() &gt; 2) { Disable($('#DropDownList2')); Disable($('#DropDownList3')); } else { Enable($('#DropDownList2')); Enable($('#DropDownList3')); } }).change(); function Enable(item) { item.removeAttr('disabled'); } }); </code></pre>
 

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