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Editorial Team
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Asked: 2026-05-25T23:05:50+00:00

Currently in my application I am having a button and a text box. The

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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 .net 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

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1 Answer

  1. Editorial Team

    in order to use the document.getElementById in asp.net and not have to use the full name, you should let asp.net 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.

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