Description of Code:
In our following sample code we have created an input text which will take input by the user and when user clicks on the button "Show Expression's Value" it calls the function callExp() . This function takes the input number by calling document.getElementById() and then we have shown output expression value in the alert() message. Here is the full html code for expExample.html as follows:
var val= document.getElementById("txt").value;
<div style="background: #cf2255; width:'100%';" align="center">
<font color="#ffffcc" size="12pt">
<div style="background: #ffffcc; width:'100%';" align="center">
Input number :<input type="text" id="txt" value=""/>
<button onclick="callExp();">Show Expression's Value</button>
Input any number to call exp method on it.
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