Restrict + symbol in TextBox using JavaScript

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Javascript

hi,
my textbox does not allowed to type + symbol,how to restrict it

Posted 24-Feb-14 18:07pm

athira Paramesh

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 25-Feb-14 0:17am

Can you type + currently? Do you want to allow it?

ravikhoda 25-Feb-14 0:39am

try onkeypress event of textbox and check for + sign ascii code .

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Peter Leow · Answer 1 · 2014-02-24T19:04:00

This will prevent input of '+' in the textbox:

XML

<!DOCTYPE html>
<html>
<head>
<script>
window.onload = function() {
    var keyupHandler = function() {
        txtInput = this.value,
        lastChar = txtInput.charAt(txtInput.length-1)
        if (lastChar=='+'){
              this.value = txtInput.substr(0, txtInput.length-1);
        }
        return;
    };
    document.getElementById('textbox1').addEventListener('input', keyupHandler, false);
}
</script>
</head>
<body>
<input id="textbox1" />
</body>
</html>