Question

I am using Server Side variable as <%=value01%> and I need the a JavaScript function to be done if value01 is an email address. I have written a JavaScript in the below way which is not working. Anybody please correct it.

    var myem = document.getElementByTagName('value01').value;

    if(myem.value.match(/[.].*[@]|[@].*[.]/))
    {
        alert('Value contains email');
    }

Answer 1

Try a hidden input or preferably use the HTML5 data- attributes:

<input id="interestingElement" type="hidden" value="<%=value01%>" /> // Hidden input
<div id="interestingElement" data-email="<%=value01%>" /> // data- attribute

Javascript:

var email = document.getElementById('interestingElement').value;  // Hidden input
var email = document.getElementById('interestingElement').attributes['data-email']; // data- attribute
if (email.match(yourEmailRegex ...