AJAX调用浏览器冻结了位，而它得到响应并执行成功 [英] AJAX call freezes browser for a bit while it gets response and executes success

问题描述

我在做一个AJAX调用我的网络服务器而获取了大量的数据。我表明，旋转，而Ajax调用执行，然后逐渐消失加载图像。

I am doing an AJAX call to my webserver which fetches a lot of data. i show a loading image that spins while the ajax call is executed and then fades away.

的事情，我已经注意到的是，所有的在这个特定呼叫的浏览器将使其无响应约7秒钟。话虽这么说，加载图像不旋转正如我曾计划而获取正在发生。

the thing i have noticed is that all of the browsers on this particular call will make it non-responsive for about 7 seconds. That being said, the loading image is NOT spinning as what i had planned while the fetch was occurring.

我不知道这是否是发生的事情，或者如果周围有办法，在一定意义上造成那里是叉（），所以它1的事情，而我的加载图标仍然旋转。

I did not know if this was something that happens or if there is a way around to, in a sense cause there to be a fork() so that it does 1 thing, while my loading icon still spins.

想法？想法？

下面是code有人想看看它：

below is the code as someone wanted to see it:

$("div.loadingImage").fadeIn(500);//.show();
            setTimeout(function(){
            $.ajax({
                type: "POST",
                url: WEBSERVICE_URL + "/getChildrenFromTelTree",
                dataType: "json",
                async: true,
                contentType: "application/json",
                data: JSON.stringify({
                    "pText": parentText,
                    "pValue": parentValue,
                    "pr_id": LOGGED_IN_PR_ID,
                    "query_input": $("#queryInput").val()
                }),
                success: function (result, textStatus, jqXHR) {
                    //alert("winning");
                    //var childNodes = eval(result["getChildrenFromTelTreeResult"]);
                    if (result.getChildrenFromTelTreeResult == "") {
                        alert("No Children");
                    } else {
                        var childNodes = JSON.parse(result.getChildrenFromTelTreeResult);
                        var newChild;
                        //alert('pText: '+parentText+"\npValue: "+parentValue+"\nPorofileID: "+ LOGGED_IN_PR_ID+"\n\nFilter Input; "+$("#queryInput").val() );
                        //alert(childNodes.length);
                        for (var i = 0; i < childNodes.length; i++) {
                            TV.trackChanges();
                            newChild = new Telerik.Web.UI.RadTreeNode();
                            newChild.set_text(childNodes[i].pText);
                            newChild.set_value(childNodes[i].pValue);
                            //confirmed that newChild is set to ServerSide through debug and get_expandMode();
                            parentNode.get_nodes().add(newChild);
                            TV.commitChanges();
                            var parts = childNodes[i].pValue.split(",");
                            if (parts[0] != "{fe_id}" && parts[0] != "{un_fe_id}") {
                                newChild.set_expandMode(Telerik.Web.UI.TreeNodeExpandMode.ServerSide);
                            }
                        }
                    }
                    //TV.expand();
                    //recurseStart(TV);
                },
                error: function (xhr, status, message) {
                    alert("errrrrror");
                }
            }).always(function () {
                    $("div.loadingImage").fadeOut();
                });
                },500);

我的一个corworker注意到了这个问题，并建议我加的setTimeout（函数（）{..}，500）;但它不解决手头的问题，所以它很可能会被删除。

A corworker of mine noticed this issue, and suggested i add a setTimeout(function(){..},500); but it does not fix the issue at hand, so it will most likely be removed.

推荐答案

由于JavaScript是单线程的，大量的同步处理将挂上事件队列和prevent其他code的执行。你的情况，这是对环这就是锁定浏览器，而它的执行。

你可以尝试是把所有的迭代到事件队列。

Since JavaScript is single threaded, a lot of sync processing will hang up the event queue and prevent other code from executing. In your case, it's the for-loop thats locking up the browser while it's executing.

What you can try is putting all your iterations into your event queue.

for (var i = 0 ; i < childNodes.length ; i = i + 1) {
    (function(i) {
        setTimeout(function(i) {
            // code-here
        }, 0)
    })(i)
}

这应该空出的处理，而不是强制浏览器来完成他们的一次。自执行的函数有没有建立一个封闭扶住循环计数器我的价值。

This should space out the processing and not force the browser to finish them all at once. The self executing function is there to create a closure to hold on to the value of the loop counter i.

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