Calling ASP.net function with parameters from javascript

Question

I have two ASP.Net functions in server side (code behind):

string GetError();
string GetErrorAtIndex(int, int);

In client side code, I use javascript to call the first function and it works fine

function test() {
    var x = <%= GetError() %>;
    alert('x');
}

However, am unable to call the second function which takes two parameters:

function test2() {
    var param1 = 10;
    var param2 = 100;
    var x = <%= GetErrorAtIndex(param1, param2) %>;
    alert('x');
}

I get the error

CS0103: The name 'param1' does not exist in the current context

I understand that this is because the javascript local variable won't have visibility in the ASP.Net call. I then thought of using HiddenFields to store/pass parameters, but am unable to do that.

Any hints/inputs would be appreciated.

Thanks!

I think that you don't understand the relationship between server and client. — crush
– crush, Commented Jan 10, 2014 at 16:30
@crush: Apart from your negative tone and no rather helpful information, I'd like to point that I have mentioned clearly that am looking for passing variables using hidden fields, without using a postback. Am sure even you don't understand that and that's why the trolling comment. — sppc42
– sppc42, Commented Jan 11, 2014 at 11:17

crush · Accepted Answer · 2014-01-10 16:31:12Z

3

Because param1 is a JavaScript variable not an ASP.NET variable.

edited Jan 10, 2014 at 16:31

crush

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answered Jan 10, 2014 at 16:30

Alborz

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1 Comment

sppc42 Over a year ago

If you read my question correctly, I already mentioned this as the last point. I fully understand that javascript vars won't have visibility in asp.net and vice versa. What I asked is of a 'way' to somehow pass this variable, without using AJAX PageMethods etc, like using ASP.Net hidden fields, which can be updated in javascript and ASP.net alike.

Gjohn · Accepted Answer · 2014-01-10 16:32:35Z

2

Look at the __doPostBack() method to send back Event Targets and arguments.

answered Jan 10, 2014 at 16:32

Gjohn

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