Introduction:
Here I will explain how to check undefined or empty value in jQuery or jQuery to check undefined variable value or empty value or null value.
Description:
In previous articles I explained jQuery get query string parameter value with spaces, jQuery get query string parameter values, asp.net pass multiple parameters in query string, jQuery Remove first/last character from string, jQuery create rounded corners for textbox and many articles relating to JQuery. Now I will explain how to check undefined or empty value in jQuery.
In previous articles I explained jQuery get query string parameter value with spaces, jQuery get query string parameter values, asp.net pass multiple parameters in query string, jQuery Remove first/last character from string, jQuery create rounded corners for textbox and many articles relating to JQuery. Now I will explain how to check undefined or empty value in jQuery.
To
check undefined values in jQuery
we need use type of operator for that we need
to write the code like as shown below
<script type="text/javascript">
$(function()
{
var UserName = $.cookie("UserName");
if (UserName != ''
&& typeof UserName != 'undefined') {
alert(QuestionId);
}
})
</script>
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3 comments :
thanks for posting such a nice article!
Great Info. Thanks for the your effort. Appreciate it.
Cant we check like this ?
if (UserName != "' && UserName != undefined && UserName != null)
{
// do something
}
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