Take value or string form textbox and show it in alert using Javascript

Javascript / Overview of Javascript

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Program:

<input type="text" id="demo">
<input type="button" onclick="msg(document.getElementById('demo').value)" value="call function"/> 

<script> 

function msg(a){  
	alert("Value from Textbox: "+a+"");  
}  

</script>

Output:

Copy above code and run it

Explanation:

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