Javascript variable undefined error

Question

Please have a look at this code.

$('#displayname').val(prompt('Enter your name:', ''));
$('#groupname').val(prompt('Enter your Group:', ''));
alert($('#displayname').val());
alert($('#groupname').val());

I read values for two variables displayname and groupname respectively through javascript prompts. Then when i alert these two variables displayname alerts the real value,whereas groupname is alerted as undefined. I could not find any syntactical errors. What can be the possible reason ? Thank You in advance.

#displayname and #groupname are (or should be) elements on the page, not variables. I don't know if that's what you meant by "variables", but I thought I would clarify in case of confusion. To use variables, it should be var groupName = someValue;. — Zhihao
– Zhihao, Commented Feb 27, 2014 at 10:09

Code Painters · Accepted Answer · 2014-02-27 10:12:25Z

0

You don't have element with particular id, so it will throw an undefined error.

Please review the following code:

<input id="displayname">
<input id="groupname">

$('#displayname').val(prompt('Enter your name:', ''));
$('#groupname').val(prompt('Enter your Group:', ''));
alert($('#displayname').val());
alert($('#groupname').val());

Demo: http://jsfiddle.net/St83V/

edited Feb 27, 2014 at 10:12

Code Painters

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answered Feb 27, 2014 at 10:06

Karthick Kumar

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