jQuery.getJSON不会触发回调 [英] jQuery.getJSON doesn't trigger callback

问题描述

我有一个html代码：

I have a html code:

<button>asd</button>
<script type = "text/javascript">
$('button').click(
    function() {
        $.getJSON('/schedule/test/', function(json) {
            alert('json: ' + json + ' ...');
        });
    }
);
</script>

和相应的视图：

def test(request):
    if request.method == 'GET':
        json = simplejson.dumps('hello world!')
        return HttpResponse(json, mimetype = 'application/json')

视图被执行（使用 print ）， json 变量初始化，但不显示警报。我做错了什么？我已经看到一些文档（ http://docs.jquery.com/Ajax/jQuery.getJSON#urldatacallback ），但我没有找到一个答案。


编辑：问题是， HttpResponse 未导入...不幸的是Django没有给出错误它。一切都是正确的。
认为

chriss

The view is executed (tested using print), json variable is initialised but no alert appears. What did I do wrong? I've already seen some docs on this (http://docs.jquery.com/Ajax/jQuery.getJSON#urldatacallback for example) but I didn't find an answer.

The problem was, that HttpResponse was not imported... Unfortunately Django gave no error about it. Everything else was correct. regards
chriss

推荐答案

很可能json没有正确的形成。有时这种情况发生在我身上，当我的代码，应该是生产json时会产生一个错误。两个选项：

It is likely that the json is not properly formed. Sometimes this happens to me when my code, that should be producing json is generating an error. Two options:

• 使用firebug查看JSON响应

• Use firebug to view the JSON response

使用jQuery.ajaxSetup选项在jquery代码中设置错误处理，例如：

Setup error handling in your jquery code using the jQuery.ajaxSetup options such as:

  $.ajaxSetup({"error":function(XMLHttpRequest,textStatus, errorThrown) {   
      alert(textStatus);
      alert(errorThrown);
      alert(XMLHttpRequest.responseText);
  }});

使用错误处理进行调试是非常好的，因为您在回答问题时立即知道。您可以查看 jQuery.ajax的jQuery文档，该文档具有所有可用选项jQuery.ajaxSetup。

Using the error handling for debugging is great, since you will know immediately when there is a problem with your response. You can check out the jQuery documentation for jQuery.ajax which has all of the available options for jQuery.ajaxSetup.

编辑：第三个选项是打开应该生成JSON的URL，并通过 JSON Lint 进行验证。

A third option would be to just open the URL that should be generating the JSON and run the output through JSON Lint to validate it.

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