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Editorial Team
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Asked: 2026-05-16T16:37:27+00:00

I need to validate a textbox that it should allow only certain characters and

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I need to validate a textbox that it should allow only certain characters and after the limit is reached the textbox should not allow entering characters in it.It can be done by Javascript but dont know how to do.. Anyone please help..

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1 Answer

  1. Editorial Team

    Here I have provided a 2 solutions:
    1)js function ‘TextLimit’:which keeps a check on count of characters typed into the textbox.
    2)maxlength attribute: specifies the maximum length (in characters) of an input field.

    <HTML>
<HEAD>
<TITLE>Test</TITLE>
<script>
function TextLimit(){
    var text = document.getElementById('myinput');
   if (text.value.length > 10){
        alert('You exceeded the limit');
        text.value = text.value.substring(0,10);
    }
}  
</script>
</HEAD>
<BODY>
<input name="myinput" type="text" value='' id="myinput" onkeyup="TextLimit()">
<br>
//this is using the maxlength attribute of textbox
<input type="text" name="inputtext" maxlength="10">
</BODY>
</HTML>
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