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MVC5-Call Back function Usage

MVC5-Call Back function Usage
A callback function is executed once the current action is over.It works asynchronsouly

function LoadDASummaryListUserFields(clFieldsFrom) {
    var qs = '?clFieldsFrom=' + clFieldsFrom;
    CallWebApiGetPartial('CallList', 'GetPerformaSummaryListFields', CBLoadCLDASummaryListUserUserFields, qs);

}
It is a sample jquery function. Here we are calling a function inside CallWebApiGetPartial

.It takes 4 parameters 1,Our Controller 2,Action 3,CallbackFunction 4,Query String Which may need to be passed

function CallWebApiGetPartial(controller, action, callBack, qryString) {
//alert(serviceData);
//alert(controller + action);   
FnShowLoader();

if ((qryString === undefined) || (qryString === null)) {
qryString = '';
}

$.ajax({
url: "/" + controller + "/" + action + qryString,
dataType: "html",
success: function (data) {
FNHideLoader();
callBack(data);
},
error: WebApiPostFailed,
cache: false
});
} 

In the above function we are using Jquery ajax to post a value to controller.
The result from controller is received inside 'data' .Which is passed to callBack function
and is returned back to our main js function

function CBLoadCLDASummaryListUserUserFields(htmlScr) {
    $('BODY').append(FNGetPopupHtml(htmlScr));
  
}


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