how to call javascript from code behind in asp.net?

Question

i have java script in my page and i want to call it from vb.net code behind from function AND didn't want to call it (onload or onclick or any similar event) but i want to call it from function doing looping.so it will be run more one time

?! ...Do you have a code snipped / example of what you try to do? — creativeby
– creativeby, Commented May 8, 2012 at 10:22
Younds like you did not understand the difference between clientside and serverside code. — ThiefMaster
– ThiefMaster, Commented May 8, 2012 at 10:23
This is not possible. Code behind = server side, javascript = client side. — Rory McCrossan
– Rory McCrossan, Commented May 8, 2012 at 10:23
example: in my page aspx i add javascript that get value of element by id <script type="javascript">function getval(elemntid) mycode;</script> and in my vbcode the function is : public function() for i = 0 to 5 (i want to call javascript here...) next i end function — Dev.H
– Dev.H, Commented May 8, 2012 at 10:41

Icarus · Accepted Answer · 2012-05-08 11:24:41Z

3

You need to do it like this:

 ' Define the name and type of the client scripts on the page. 
    Dim csname1 As [String] = "PopupScript"
    Dim cstype As Type = Me.[GetType]()

    ' Get a ClientScriptManager reference from the Page class. 
    Dim cs As ClientScriptManager = Page.ClientScript

    ' Check to see if the startup script is already registered. 
    If Not cs.IsStartupScriptRegistered(cstype, csname1) Then
        Dim cstext1 As New StringBuilder()
        cstext1.Append("<script type=text/javascript> getval('elementid') </") 'Your javascript function
        cstext1.Append("script>")

        cs.RegisterStartupScript(cstype, csname1, cstext1.ToString())
    End If

Source.

answered May 8, 2012 at 11:24

Icarus

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2 Comments

Icarus Over a year ago

Whomever downvoted this had no reason to do it. This is exactly what the OP is asking and it will definitely work.

Dev.H Over a year ago

thanks,but can i use it direct in my function in behind code to run it or putting it in page load to register it only

Jason C · Accepted Answer · 2012-05-08 12:24:53Z

0

This is actually possible using SignalR.

https://github.com/SignalR/SignalR

Very cool stuff.

A persistent connection sounds like it would do what you are looking for.

https://github.com/SignalR/SignalR/wiki/PersistentConnection

answered May 8, 2012 at 12:24

Jason C

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1 Comment

Dev.H Over a year ago

thanks for your answer but i don't understand how can i use it in my problem

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