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Editorial Team
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Asked: 2026-06-04T05:44:08+00:00

I want to make a button that changes the value of an element in

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I want to make a button that changes the value of an element in an array. I am trying to do it by the following code but the element does not change. As a self learning beginner, I am probably missing something very obvious and I would appreciate if someone can point that out to me.

Thank you for your answers!

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Change Array Value</title>

</head>

<body>
<textarea id="log2"></textarea>
<input type="button" onClick="uClicked();" value="Click!">
<script>
    var fer=[];

    for (i=0; i< 15; i++){
            fer[i]=i+1;
    }

    function uClicked(fer){
        fer[12] = 10; 
        return fer[12];
    }
    log2.value = "fer[12]= " + fer[12];

</script>
</body>
</html>
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1 Answer

  1. Editorial Team
    function uClicked(){ // remove the parameter.

    The parameter isn’t needed, and is hiding the real fer variable.

    Because fer was declared in outer scope, uClicked function can access it.

    Fixed code:

    var fer=[];

for (i=0; i< 15; i++){
        fer[i]=i+1;
}

function uClicked(){
    fer[12] = 10; 
    alert(fer[12]);
}
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