如何让 jQuery 执行同步而不是异步的 Ajax 请求? [英] How can I get jQuery to perform a synchronous, rather than asynchronous, Ajax request?

问题描述

我有一个提供标准扩展点的 JavaScript 小部件.其中之一是 beforecreate 函数.它应该返回 false 以防止创建项目.

I have a JavaScript widget which provides standard extension points. One of them is the beforecreate function. It should return false to prevent an item from being created.

我已经使用 jQuery 在这个函数中添加了一个 Ajax 调用:

I've added an Ajax call into this function using jQuery:

beforecreate: function (node, targetNode, type, to) {
  jQuery.get('http://example.com/catalog/create/' + targetNode.id + '?name=' + encode(to.inp[0].value),

  function (result) {
    if (result.isOk == false) 
        alert(result.message);
  });
}

但我想阻止我的小部件创建项目，所以我应该在母函数中返回 false，而不是在回调中.有没有办法使用 jQuery 或任何其他浏览器内 API 执行同步 AJAX 请求?

But I want to prevent my widget from creating the item, so I should return false in the mother-function, not in the callback. Is there a way to perform a synchronous AJAX request using jQuery or any other in-browser API?

推荐答案

来自 jQuery 文档:您将 asynchronous 选项指定为 false 以获取同步 Ajax 请求.然后你的回调可以在你的母函数继续之前设置一些数据.

From the jQuery documentation: you specify the asynchronous option to be false to get a synchronous Ajax request. Then your callback can set some data before your mother function proceeds.

如果按照建议进行更改，您的代码将如下所示:

Here's what your code would look like if changed as suggested:

beforecreate: function (node, targetNode, type, to) {
    jQuery.ajax({
        url: 'http://example.com/catalog/create/' + targetNode.id + '?name=' + encode(to.inp[0].value),
        success: function (result) {
            if (result.isOk == false) alert(result.message);
        },
        async: false
    });
}

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