Deciphering JSON data retrieved from a RESTful server

My goal is to create a graph from a table using Google's graph API. Upon loading the page, it retrieves JSON data from my REST server with this JavaScript function.

No errors are shown in the JavaScript console.

 $(document).ready(function() { 
        $.ajax({
                      url: 'http://localhost:8004/project5',
                      dataType: "json",
                      async:false,
                      error: function(error){
                             console.debug(error);
                         },
                      success:  function(data)
                        {
                                alert("YESSSSS");   
                                var data = data.results;    
                                for(var i=0; i<data.length; i++) {

                                    mytable[arraysize] = new terms(data[i].term1, data[i].term2, (data[i].contains)/((data[i].contains)+ (data[i].notcontains)));
                                    arraysize +=1;

                                }

                                    drawTable();

                        }


                    });
    });

Here is the JSON data retrieved when querying the server in the browser using "http://localhost:8004/project5"

{
  "results":[
  {
     "term1":"test",
     "term2":"hard",
     "contains":"32",
     "notcontains":"55"
  },
  {
     "term1":"test",
     "term2":"easy",
     "contains":"32",
     "notcontains":"55"
  },
  {
     "term1":"pizza",
     "term2":"hut",
     "contains":"32",
     "notcontains":"55"
  }
   ]
}

Despite my efforts, the HTML content is not displaying "YESSSS" as expected for testing the success of the function. The REST server recognizes the query and returns the JSON data, leading me to believe the issue lies in extracting the data from the JSON response.

UPDATE: It appears that the success function is not being executed. This function is called in the Java REST server, JAX-RS, to generate the JSON.

 @GET
  @Produces(MediaType.APPLICATION_JSON)
  public String getStudentByid(@QueryParam("id") String id) {

      System.out.println("Queried");
      if (id == null)
          return Terms.stringTerms(container);
      return Terms.getTermsByFirst(container, id);
 }

Now I am encountering an error stating

XMLHttpRequest cannot load http://localhost:8004/project5/terms.json. Origin null is not allowed by Access-Control-Allow-Origin.

Answer №1

After reviewing your recent updates, it appears that there may be a vulnerability related to cross site scripting. It seems that you are sending an ajax request to a domain that is different from where your HTML page originated.

This issue may only be present during development, as in a production environment, the HTML page and the ajax request may come from the same source. It would be beneficial to ensure that your development setup mirrors a real deployment scenario.

One solution could be to use a legitimate web server to serve your HTML page instead of simply accessing it from a local drive.

Answer №2

If you're stuck on a problem, try inserting console.log("checkpoint A")

or B or C, at different points in your code to pinpoint where the issue lies. That's where you need to focus your troubleshooting efforts.

Consider logging other variables or values for additional insights.

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