调试带有运行时错误的jquery ajax脚本 [英] debugging jquery ajax script with runtime error

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问题描述

如何从jQuery AJAX接收的脚本中看到运行时错误?

我正在编写一个(自由软件)应用程序(MELT监视器,在GNU / Linux / Debian / x86-64)嵌入其特定的Web服务器。有关详细信息,请参阅此问题。我在提交 d624e22497de ...



我在Linux / Debian / Gnu / x86-64上使用Firefox 38或42,并安装了最新的Firebug。
$ b m使用jQuery的 $。ajax 和脚本:

  $。 ajax 
({url:/ canvasedit,
method:POST,
data:{do_fillcanvas:true},
dataType:script,
成功:ajaxcanvascript
});

正确调用 ajaxcanvascript 显示 console.log ),所以从HTTP的角度来看,AJAX请求已经成功(200 OK)。



然而,当AJAX收到的脚本中存在运行时错误时, do_fillcanvas ,这是一个类似于以下内容的生成的脚本:

  console.log('dofillcanvas canvedit.c:206 siz 1; this =',this,
'momc_display_canvas =,momc_display_canvas);
momc_display_canvas('09:26:39',[
momc_top_entry(momc_item_ref('notice'),
momc_node(momc_item_ref('comment'),
[
momc_string(some simple notice),
momc_node(momc_item_ref('web_state'),
[
momc_int(2)]),
momc_item_val('hashset'),momc_set ([
momc_item_ref('canvasedit'),
momc_item_ref('microedit'),momc_item_ref('the_agenda')])

momc_tuple([
momc_item_ref 'web_session'),momc_nil_ref(),
momc_item_ref('the_system')])
)))]);

console.log('dofillcanvas canvedit.c:239 this =',this);
addupdatehtml('显示< tt> Sat Nov 7 09:26:39 2015 MET< / tt>');
console.log('dofillcanvas canvedit.c:252 done 09:26:39.11 this =',this);

我的Firebug控制台中没有任何错误信息(或者从Firefox中看不到任何错误消息) / p>

我正在调试的那种运行时错误是eg从 momc_display_canvas (它使用 jcanvas 我不是很熟悉)。



所以,如何从jQuery AJAX收到的脚本中轻松地看到运行时错误?



我在每一处都加入 console.log ,但这样不方便...

解决方案

如果我是正确的,那么在调用ajax到ajax的时候要求处理错误。 jQuery的ajax有一个错误的参数回调函数,您可以使用该回调来处理您的错误。

  $。ajax({ 
...
error:function(error){
console.log(error);
}
...
})

如果你想处理总的错误,你可以使用try catch块来包装整个ajax调用。你
})


How can I see a runtime error from a jQuery AJAX received script?

I'm coding a (free software) application (the MELT monitor, on GNU/Linux/Debian/x86-64) which embeds its specific web server. See this question for details. I'm at commit d624e22497de...

I'm using Firefox 38 or 42 on Linux/Debian/Gnu/x86-64 with a recent Firebug.

I'm using a jQuery's $.ajax with a script:

$.ajax
({url: "/canvasedit",
  method: "POST",
  data: {"do_fillcanvas": true},
  dataType: "script",
  success: ajaxcanvascript
 });

The ajaxcanvascript is correctly called (and the console.log there is displayed), so from an HTTP point of view, the AJAX request has succeeded (200 OK).

However, when there is a runtime error in the AJAX received script by do_fillcanvas, which is a generated script similar to something like:

     console.log('dofillcanvas canvedit.c:206 siz 1; this=', this,
        ' momc_display_canvas=',momc_display_canvas);
 momc_display_canvas('09:26:39',[
     momc_top_entry(momc_item_ref('notice'),
           momc_node(momc_item_ref('comment'),
                 [
                 momc_string("some simple notice"),
                 momc_node(momc_item_ref('web_state'),
                       [
                           momc_int(2)]),
                 momc_item_val('hashset'), momc_set([
                     momc_item_ref('canvasedit'),
                     momc_item_ref('microedit'), momc_item_ref('the_agenda')])
                 ,
                 momc_tuple([
                     momc_item_ref('web_session'), momc_nil_ref(), 
                     momc_item_ref('the_system')])
                 ]))]);

 console.log('dofillcanvas canvedit.c:239 this=', this);
 addupdatehtml('displayed <tt>Sat Nov  7 09:26:39 2015 MET</tt>');
 console.log('dofillcanvas canvedit.c:252 done 09:26:39.11 this=', this);

I've got no error message in my Firebug console (or nothing easily visible from Firefox).

The kind of runtime error I am debugging is e.g. some undefined method called deep from momc_display_canvas (which uses jcanvas, which I am not very familiar with).

So, how to easily see runtime error from a jQuery AJAX received script?

I'm adding console.log everywhere, but that is not convenient...

解决方案

If I am right then you are asking to handle error while calling the ajax to the ajax complete. The jquery ajax has a parameter callback function for error, you can use that callback to handle your error.

$.ajax({
...
error: function(error){
console.log(error);
}
...
})

If you want to handle total error you can use try catch block wrapping around the total ajax call.Hope this will help you })

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