how to pass a variable to a Page Method Success callback function

Question

i'm using asp.net PageMethods.So here is the way i make a call to the method from javascript

function hello()
{
    var a =10;
    PageMethods.SaveData(JSON.stringify(basicInfo), SaveSuccessCallback, SaveFailedCallback);
}

And here is my success call back condition

    function SaveSuccessCallback(response) {
    //handle success code here
    ShowEdit();
}

Now i wanted to handle the ShowEdit() based on a variable a which is in the hello function. The issue is i don't know if its possible to pass a from hello to SaveSuccessCallback . Note: i can't make a global.

Answer 1

You can use a closure:

var a = 10;
PageMethods.SaveData(
    JSON.stringify(basicInfo),
    function(response) { 
        SaveSuccessCallback(response);
        ShowEdit(a);
    }, SaveFailedCallback);

function SaveSuccessCallback(response) {
   //handle success code here
}

You may prefer to make this a bit cleaner by wrapping up the closure in another method:

PageMethods.SaveData(
    JSON.stringify(basicInfo), SaveSuccessCallback(10), SaveFailedCallback);

function SaveSuccessCallback(a) {
    return function(response) {
        //handle success code here
        ShowEdit(a);
    };
}