Dealing with an Ajax request that returns a file or partial HTML in the event of an error - what is the best approach?

Imagine a scenario where we are engaged in a dialogue with certain settings. Upon clicking the "OK" button in the dialogue, the settings are transmitted to a controller function through an AJAX call. This call may either yield a downloadable file or an error message represented within a portion of HTML source code. In the latter case, this error message needs to be displayed within the dialogue window.

$.ajax( { 
   url: url, 
   data: dialogFormData, 
   success: function(data) { ???? }
});

How can we effectively manage this situation? How should we handle the response from the AJAX call to interpret the outcome? Any suggestions?

javascriptajaxerror-handlingdownload

Answer №1

To achieve what you're looking for, it's important to check the response type and then take appropriate actions.
You can experiment with something like this:

$.ajax({
  url: url, 
  data: dialogFormData, 
  success: function(response, status, xhr){ 
    var ct = xhr.getResponseHeader("content-type") || "";
    if (ct.indexOf('multipart/form-data') > -1) {
      // process file
    }
    if (ct.indexOf('text/html') > -1) {
      // handle html content
    } 
  }
});

This code snippet has not been tested yet, so you may need to adjust the types accordingly.

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