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POPrevent postback on Enter in a asp.net inputfield
 

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    <p>I have a problem with the key Enter in javascript and asp.net</p> <p>I have a control like this with a textchanged event which does a find but I want to control it when the user does enter</p> <pre><code>&lt;asp:TextBox ID="TextBox1" runat="server" onkeyup="EnterEvent(event)" AutoPostBack="true" OnTextChanged="TextBox1_TextChanged" /&gt; </code></pre> <p>That's why I created this javascript function which works very well. Because it avoids the Enter postback at any character input</p> <pre><code> function EnterEvent(e) { var keycode = (e.keyCode ? e.keyCode : e.which); if (keycode == 13) { return true; } else { return false } } </code></pre> <p>And then I wanted to control when the TextBox has content, so I changed the js like this.</p> <pre><code> function EnterEvent(e, ctrl) { var keycode = (e.keyCode ? e.keyCode : e.which); if (keycode == 13) { return ctrl.value.length &gt; 2; } else { return false } } </code></pre> <p>The control</p> <pre><code>&lt;asp:TextBox ID="TextBox1" runat="server" onkeyup="EnterEvent(event, this)" AutoPostBack="true" OnTextChanged="TextBox1_TextChanged" /&gt; </code></pre> <p>But nothing happens. Anytime that I do Enter, the page postback.</p> <p>I also added this in the code behind on the load page</p> <pre><code> TextBox1.Attributes.Add("onkeypress", "EnterEvent(event, this);"); TextBox1.Attributes.Add("onkeyup", "EnterEvent(event, this);"); TextBox1.Attributes.Add("onkeydown", "EnterEvent(event, this);"); </code></pre> <p>My page is still doing postback at Enter key. The idea is to stop the Enter postback if at least has 3 characters. Any idea or another approach?</p> <p><strong>> -----------------EDIT--------------------</strong></p> <p>I added this function before the EnterEvent</p> <pre><code> $(function () { $(':text').bind('keydown', function (e) { if (e.keyCode == 13) e.preventDefault(); }); }); </code></pre> <p>But it blocks the Enter in all the page. Enter doesn't work AT ALL.</p> <p><strong>> -----------------EDIT 2--------------------</strong></p> <p>Well, I succeded! As I said in a previous comment, I tried like in the past adding a dummy button control and I transfered the event from the textbox and calling its click event. <strong>It's not CLEAN AT ALL but it works</strong> and I'm in a hurry. Thank you all you guys for answering. If someone can help still I would appreciate it. I'll continue reviewing this question. Thanks.</p> <pre><code> function EnterEvent(e, ctrl) { var keycode = (e.keyCode ? e.keyCode : e.which); if (keycode == 13 &amp;&amp; ctrl.value.length &gt; 2) { $('[id$=Button1]').click(); } else { return false; } } &lt;asp:TextBox ID="TextBox1" runat="server" onkeyup="EnterEvent(event, this)" /&gt; &lt;asp:Button ID="Button1" runat="server" OnClick="TextBox1_TextChanged" style="visibility:hidden;width:0;"/&gt; </code></pre>
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    1. COwhat about using an updatepanel and in the codebehind event you look if there are more than 3 characters ?
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    2. COI did that just now. Postback continues and the control disappear.
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    3. COuhm okay, how did you set your trigger ?
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