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Currently in my application I am having a button and a text box. The user types something in the textbox and then presses the button. What I want is that:

The search button should should stay disabled when the page loads for the first time. I can achieve that by setting it to disabled in the code behind file.

Now I want it to remain disabled when the user types upto 2 characters. The moment the user types third character the button should get enabled automatically.

The important thing is that it has to be done without asp AJAX since this website will be run from old mobile phones. So only pretty basic javascript or jquery is supported.

Any help will be appreciated.

Thanks

Varun

Currently in my application I am having a button and a text box. The user types something in the textbox and then presses the button. What I want is that:

The search button should should stay disabled when the page loads for the first time. I can achieve that by setting it to disabled in the code behind file.

Now I want it to remain disabled when the user types upto 2 characters. The moment the user types third character the button should get enabled automatically.

The important thing is that it has to be done without asp AJAX since this website will be run from old mobile phones. So only pretty basic javascript or jquery is supported.

Any help will be appreciated.

Thanks

Varun

  • javascript
  • asp
  • button
  • textbox
Share Improve this question edited Nov 16, 2011 at 18:10 Joel Coehoorn 416k114 gold badges578 silver badges813 bronze badges asked Sep 29, 2011 at 20:18 Varun SharmaVarun Sharma 2,7619 gold badges50 silver badges65 bronze badges
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3 Answers 3

Reset to default 4

in order to use the document.getElementById in asp and not have to use the full name, you should let asp provide it. Instead of: document.getElementById("ctl00_ctl00_phContent_phPageContent_btnSearch")

Try:

document.getElementById('<%= btnName.ClientID %>')

Where btnName is the asp:Button Id. The <%= code will generate the actual button id, fully qualified, so you don't have to worry about things changing with the hard coded id.

I got this to work with a HTML text box, I don't think you can do it with a asp text box:

<head>
    <script type="text/javascript">
        function TextChange() {
            var t = document.getElementById("Text1");
            var b = document.getElementById("Button1");
            if (t.value.length > 2) {
                b.disabled = false;
            }
            else {
                b.disabled = true; 
            }


        }

    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <input id="Text1" type="text"  onkeyup="TextChange();" />
        <asp:Button ID="Button1"   runat="server" Text="Button" Enabled="False" />
    </div>
    </form>
</body>

If you're using jQuery, use 

$(<selector>).val().length

to get the size, then you can set the button's disabled attribute with 

$(<button selector>).attr('disabled',false).

本文标签： aspnetEnabling Disabling button asp netusing javascriptStack Overflow

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