获取所有未决的AJAX请求

Question

How I can check all pending AJAX requests and skip all pending requests except last? For example, I have 3 payment methods and when I click rapidly 3-5 times I see 1 pending request and 3-5 waiting requests. So I need skip all of them except the last one.

Answer 1

Use this type of pattern

// Is an ajax request pending?
var isPending = false;

function doAjax(){
    // If a request is pending, don't make another one
    if(isPending) return;
    // Set pending flag to true
    isPending = true;
    $.ajax({
        // parameters and stuff
    }).done(function(){
        // reset the pending flag
        isPending = false;
    });
}