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I am trying to call a javascript function from asp.net codebehind using onclientclick for a linkbutton. Code is like this:

string x = "redirecttoimagepage"+"("+ y+")";//y has an int value i need and it varies
lnkimagepage.OnClientClick = x;

i need to use the value y in the javascript function for using. 

 function redirecttoimagepage(variable)
{
var strURL = "Subpages.aspx?tabID="+variable;
window.open(strURL,"_blank");
return true;
}

Right now, with the code i have shared, it doesnt do anything. After the link is clicked, it stays in the same page. What am i doing wrong? Appreciate all your help guys. Thanks a lot!

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5 Answers

up vote 4 down vote accepted 
string x = "redirecttoimagepage"+"('"+ y+"')";
lnkimagepage.Attributes.Add("onclick",x);

EDITED

in addition, just noticed that lnkimagepage is a LinkButton so it will be hard to invoke redirecttoimagepage script as LinkButtons are already associated with __doPostBack jscript. use HyperLink instead of LinkButton

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How would this be different from OnClientClick? – Domenic Jun 22 '11 at 14:01
@Domenic asp.net 2.0 (and above) have a OnClientClick property, This is basically a shortcut for Attributes[”onclick”]. no differences... its just a way I got used to write a code... – Niko G. Jun 22 '11 at 14:15
OK, then my question is why is this different from the OP's code. I guess the stuff after the edit is relevant, but otherwise it does the exact same thing. – Domenic Jun 22 '11 at 14:17
1  
remo did missed the apostrophe, as he had "redirecttoimagepage"+"("+ y+")". the right form is "redirecttoimagepage"+"('"+ y+"')". test urselft the first version wil give u x equals to redirecttoimagepage(value_of_y) while my version gives redirecttoimagepage('value_of_y'). this way jscript redirecttoimagepage is called and value_of_y is passed as parameter – Niko G. Jun 22 '11 at 14:24
Ah! Damn, hard to spot those little apostrophes :P. OK, +1 it is. – Domenic Jun 22 '11 at 14:27
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up vote 1 down vote

I am trying to call a javascript function from asp.net codebehind using onclientclick for a linkbutton. Code is like this:

Your doing it wrong. The HTTP model is a model of requests. The page talks to the server not the other way around.

If you truly need a bi-directional communication channel use WebSockets

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It seems like he's doing it (conceptually right) but his explaination is ridiculous. It seems like he does not know what "to call a function" means. – Stilgar Jun 22 '11 at 14:13
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up vote 0 down vote

first you could try prepending javascript: to indicate that its a js function

string x = "javascript:redirecttoimagepage"+"("+ y+")";
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He is setting the onclick attribute, which is not a URL and should not have the javascript: pseudo-protocol prepended to it. – Domenic Jun 22 '11 at 14:00
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up vote 0 down vote 
string x = "redirecttoimagepage"+"('"+ y+"')"; 
lnkimagepage.Attributes.Add("onclick",x);

**in javascript**
window.open("PageName.aspx");
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up vote -1 down vote

I think you must specify complete url with window.open not just page name.....

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This is false; it works just like any other URL and can be either relative or absolute. – Domenic Jun 22 '11 at 14:14
thanx for correcting & helping me... – Ovais Khatri Jun 22 '11 at 14:23
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