ASP call javaScript from c#

Question

In my code I have used a dropdown onSelectedIndexChanged event and few things happen... I want to call JavaScript after that.... I have tried using

dropdown.Attributes.Add("onchange", "javascript:alert('Test');");

the above code does not fire

and

dropdown.Attributes.Add("onblur", "javascript:alert('Test');");

this is also not useful as the dropdown is autopostback and it loses focus because of that

Is there any way through which I can call JavaScript function through c#?

It should work. Check this stackoverflow.com/questions/12517227/… may be useful — Murali Murugesan
– Murali Murugesan, Commented Apr 1, 2014 at 11:28
This would call javacript as soon as the dropdown changes... I want to call javaScript after few actions are performed.... — Crazy Programmer
– Crazy Programmer, Commented Apr 1, 2014 at 11:30

Community · Accepted Answer · 2020-06-20 09:12:55Z

1

`Your question was: Is there any way through whihc I can call Javascript function through c#`

To answer that:

You can use two methods:

ClientScript.RegisterClientScriptBlock(this.GetType(), "anyUniqueName", "script here", true);
ClientScript.RegisterStartupScript(this.GetType(), "anyUniqueName", "script here", true);

1st method just puts a block, while the second one puts the tag at the bottom of the page

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Apr 1, 2014 at 11:29

Amit Joki

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Comments

bastos.sergio · Accepted Answer · 2014-04-01 11:38:06Z

1

Add this (in your C# method)

protected void onSelectedIndexChanged(Object sender, EventArgs e)
{
    //do stuff
    ...

    ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "alert('Test');", true);
}

answered Apr 1, 2014 at 11:38

bastos.sergio

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