How to check null string in java script

[Rmesh]

hi friends i have how to javascript string null value i have get the sessin value in one string variable var ListId='<%=Session["LiatingId"]%>'] if(ListId != ""){ alert('not null')} else alert('null') if the listid is null then also alert('not null ')is executed how to solve this problem Thanks in Advance

[Vasudevan Deepak Kumar]

What does Viewsource show up? Did you check with length?

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[Rmesh]

yes i have solved that problem,using string.length function

[Vasudevan Deepak Kumar]

Actually even in C#, the length comparison is considered faster than string.Empty == strVariable

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[Akhilesh Yadav]

I've done scripting long back but i think javascript treats null as "null" [string] U need to check these string rather than checking the empty state. Just give a try

--Akki