Ajax request launches struts action with empty parameters

Question

The ajax request launches a struts action with empty parameters. When using dev mode on firefox and debugging the code, i can see that when the breakpoint stops inside the action, the XHR envelope on firefox is empty, no header, no request, no response, ...

Only when the action is done, the envelope seems to be populated with status 200 and header/request/response are filled...

The ajax request :

$.ajax({
       url: "searchFor",
       type: 'POST',
       dataType: 'json',
       data: JSON.stringify({Number: Number, SearchReason: $("#"+inputReason).val()}),
       contentType: 'application/json',
       //mimeType: 'application/json',
       async: false,
       success: function (data) { … }
       ...

Roman C · Accepted Answer · 2024-09-01 12:49:24Z

To see the XHR when you debugging in Firefox should set a breakpoint on the URL:

Set an XHR breakpoint:

An XHR (XMLHttpRequest) breakpoint breaks code execution when an XHR request is dispatched so that you can examine the current state of the program. You can break on all requests or on those that include a specific URL. To turn on the feature:

Open the debugger

Click on “Pause on any URL” which acts as a wild card, causing the code to pause on any call, or,

Click the plus sign next to the XHR breakpoints header, enter the URL in which you are interested, and press Enter.

Also if you mind about a version of Firefox then you should read XHR Breakpoints in Firefox developer tools.

You can also see a Network Monitor:

The Network Monitor shows you all the HTTP requests Firefox makes (for example, when it loads a page, or due to XMLHttpRequests), how long each request takes, and details of each request.

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Ajax request launches struts action with empty parameters

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Set an XHR breakpoint:

You can also see a Network Monitor:

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Set an XHR breakpoint:

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