Call javascript function from switch case in asp.net mvc

Question

Want make call to javascript function from switch case statment in asp.net mvc:

@select Case imageExistOrNot(this)
   Case True
      @<a onclick="showCardImage(this)">Show</a>
   Case False
      @<a>No Image</a>
End Select

And have test JS method:

function imageExistOrNot()  
{
    return false;
}

You are calling a client method named showCardImage but the only js method you have in your question is named imageExistOrNot. Also you pass in 1 parameter but the method defined takes 0 parameters.... Is there something you are not showing or included by mistake?? — Igor
– Igor, Commented Jan 31, 2017 at 12:57
I have no knowledge of VB.NET, but I have the feeling your @select Case is executed on server-side. If that's the case, then what you are asking is not possible and does not make sense at all. — Matias Cicero
– Matias Cicero, Commented Jan 31, 2017 at 12:57
@CamiloTerevinto - ah. Ok, then its simple, you cant call client side script during server side rendering of the view. — Igor
– Igor, Commented Jan 31, 2017 at 12:58
I need to call controller method that return true/false, instead of js function? — Ballon Ura
– Ballon Ura, Commented Jan 31, 2017 at 13:01

Camilo Terevinto · Accepted Answer · 2017-01-31 12:59:18Z

0

ASP.NET MVC => runs at server
Javascript => runs at client, once server finished processing

You are expecting the server to know the result of a client function, which is not possible.

answered Jan 31, 2017 at 12:59

Camilo Terevinto

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3 Comments

So how can i determine if image exist ot not? with controller method?

@BallonUra You need to perform the validation with Javascript and then call the server using AJAX (for example)

@BallonUra How are you using JS to determine if the image exists or not? Surely that's a server-side function anyway?