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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>
533
asked Dec 02 '25 05:12
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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