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document.getElementById() method - Javascript

The document.getElementById() method returns the element of specified id.

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html code

 
<form>  
    Enter No:<input type="text" id="number" name="number"/><br/>  
    <input type="button" value="cube" onclick="getcube()"/>  
</form>  

Javascript Code

<script type="text/javascript">  
function getcube(){  
    var number=document.getElementById("number").value;  
    alert(number*number*number);  
}  
</script>  

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