Introduction: In this article I am going to explain how to evaluate/
calculate a string expression as a mathematical expression using jquery/Javascript’s
eval() function.
In previous articles i explained Difference Between Jquery And Javascript and Dropdownlist With Checkboxes Using Jquery Bootstrap Multi Select Plugin and Add Textbox Search Functionality In Asp.Net Checkboxlist Using Jquery and Bootstrap Modal Dialog Popup Example In Asp.Net and Show Gridview Row Details Using BootstrapTooltip On Mousehover The Cell
Description: The eval() function evaluates or executes an argument.
If the argument is an expression, eval() evaluates the
expression. If the argument is one or more JavaScript statements, eval()
executes the statements.
Syntax: eval(string)
Implementation: Let’s understand by an example.
<html>
<head>
<title></title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script type="text/javascript">
function EvaluateExpression() {
var expression = $('#txtExpression').val().trim();
if (expression != '') {
try {
var result = eval(expression);
$('#spnMessage').html('Result is : ' + result);
}
catch (e) {
$('#spnMessage').html('Expression in invalid.');
}
}
else {
$('#spnMessage').html('Please enter expression.');
}
}
</script>
</head>
<body>
<input type="text" id="txtExpression" />
<button type="button" onclick="EvaluateExpression();">Evaluate</button><br /><br />
<span id="spnMessage"></span>
</body>
</html>
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