Calling a function in js file from C# code

Question

I am having a cs file where I want to call the function of js file.

Js File

Function foo(date){
//code
}

In a cs file, I want to call the foo function. Is it possible ? If yes, then how ?

If I want to insert just one alert then this is how I do it, but If I want to call a function, then I dont know the way.

To call just an inline javascript this works

Page.ClientScript.RegisterStartupScript(GetType(), "", "<script type='Text/JavaScript'> alert('Hello');</script>");

Calling alert is calling a function. What are you trying to do exactly and what issue are you having? — Rick S
– Rick S, Commented Jun 18, 2015 at 19:57
@RickS When I write Page.ClientScript.RegisterStartupScript(GetType(), "", "foo()", true); , it shows "Page.ClientScript.RegisterStartupScript(GetType(),"","foo()",true);" — hello temp11
– hello temp11, Commented Jun 18, 2015 at 20:08

laskdjf · Accepted Answer · 2015-06-18 20:13:19Z

3

Try putting the function name rather than the whole script itself.

Page.ClientScript.RegisterStartupScript(GetType(),"","foo()",true);

or with ScriptManager:

ScriptManager.RegisterClientScriptBlock(this, this.GetType(),"","foo()",true);

Edit:

Add the boolean value at the end to true, so it will automatically add script tags, then you dont need to.

edited Jun 18, 2015 at 20:13

answered Jun 18, 2015 at 19:57

laskdjf

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8 Comments

hello temp11 Over a year ago

It shows "Object reference not set to an instance of an object".

hello temp11 Over a year ago

it works if there is no argument in the foo function, but if I have a date parameter passed, then how can I pass it with the code Page.ClientScript.RegisterStartupScript(GetType(),"","foo()",true). It works if there is no argument.

laskdjf Over a year ago

can I see how you are passing the arguments.

hello temp11 Over a year ago

Page.ClientScript.RegisterStartupScript(GetType(), "a", "foo("aa","bb")", true); Foo has 2 arguments in the function.

laskdjf Over a year ago

the problem is not one or two variables, it is how they are being used. foo(' " + hello + " ', ' " + wor + " ');" without the single quotes, it thinks that hello and wor are javascript variables and looks for those variables in the <script> tags. Since they are declared and initialized in C# we need to pass them as strings to the javascript function.

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