Manage construction of javascript call when 2nd parameter is null?

Question

I have a javascript call in OnClientClick that looks like the following:

OnClientClick='<%# "return DisplayAlert(" + Eval("BedNum") + "," + Eval("ClientId") + ");" %>'

But when ClientId is null, the function call is constructed incorrectly with error Uncaught SyntaxError: Unexpected token ) since the function call produces return DisplayAlert(value, );

Is there a way to avoid this error when the 2nd parameter is null?

Thanks

How in the world is that a duplicate? You're suggesting adding `ToString().Length`? — fdkgfosfskjdlsjdlkfsf, Apr 23 '16 at 19:46
It is not a duplicate that asks/answers **exactly the same** question. But it is a duplicate that needs to solve basically **the same problem** - to Eval or not to Eval something conditionally (in your case comma+second argument). So it at least should give you some ideas. — Eugene Podskal, Apr 23 '16 at 19:48
You're right and I apologize. I did, and I ended up using something like this: `OnClientClick=''` — fdkgfosfskjdlsjdlkfsf, Apr 23 '16 at 19:51
That way, if 2nd parameter is `null` then I get 0. Otherwise, I get a positive value. Thanks again. — fdkgfosfskjdlsjdlkfsf, Apr 23 '16 at 19:52
Does this http://stackoverflow.com/questions/894860/set-a-default-parameter-value-for-a-javascript-function fix your problem right way ? — Syed Ekram Uddin, Apr 23 '16 at 19:52

score 0 · Answer 1 · answered Apr 23 '16 at 19:49

0

If I understand correctly, all you would need to do is check its value, and for null have a default value of your choosing, or the original clientId in the case that it isn't null.

Something like this:

ClientId == null ? "whateverDefaultValueYouWant" : clientId

answered Apr 23 '16 at 19:49

smaili

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the issue isn't the javascript function. The problem is the call when 2nd value is `null`. – fdkgfosfskjdlsjdlkfsf Apr 23 '16 at 20:11

Manage construction of javascript call when 2nd parameter is null?

1 Answers1