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Editorial Team
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Asked: 2026-05-13T21:06:06+00:00

is it posible to replace a character at a specific position within a textarea

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is it posible to replace a character at a specific position within a textarea or textbox? I can work out the position using indexOf() but knowing this how can i actually replace that particular character?

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1 Answer

  1. Editorial Team
    <html>
<head>
<script>
function modText()
{
 var tb = document.getElementById("mtb");
 var indexToReplace = 1;
 var stringToPutIn= "!";
 var temp = tb.value;
 var startString = temp.substr(0, indexToReplace);
 var endString = temp.substring(indexToReplace+1);
 tb.value = startString+stringToPutIn+endString;
}
</script>
</head>
<body>
<input type="text" id="mtb" /><br />
<input type="button" onclick="modText();">
</body>
</html>

    The replace function will NOT work because you might have the same letter coming before the letter you wish to replace.

    Note the above function only works if you’re replacing one and only one character.

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