Challenges with handling JSON data in JavaScript

I am currently attempting to retrieve and parse JSON data in order to display it on a blank HTML file. Unfortunately, I keep encountering an issue where if I retrieve and parse the data, I receive an error stating 

Uncaught TypeError: Cannot read property 'SOCENGPRE' of undefined
. On the other hand, when I fetch the JSON data with the format set as dataType: "text", I encounter the error message 
XMLHttpRequest cannot load <api url> No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.
. The website I am working on is located on a local machine, and due to personal reasons, I am unable to make server edits for cross-platform compatibility. Here is a snippet of the code:

var myDataVar;
function main() {
    $.ajax({
        url: "http://api&leagues=SOCENGPRE&format=jsonp&callback=?",
        dataType: "json",
        success: function (data) {
            myDataVar = $.parseJSON(data);
            getUpcomingFixtures();
        }
    });
}
function getUpcomingFixtures() {
    for (var i = 0; i <= myDataVar.SOCENGPRE.fixtures.length - 1; i++) {
        console.log(myDataVar.SOCENGPRE.fixtures[i].id);
        console.log(myDataVar.SOCENGPRE.fixtures[i].home_team + " vs " + myDataVar.SOCENGPRE.fixtures[i].away_team);
    }
}

An example of the fetched data resembles the following structure:

{
    "SOCENGPRE": {
        "league_name": "Barclays Premier League",
        "league_phid": null,
        "league_type": null,
        "fixtures": [{
            "id": "64714",
            "code": "SOCENGPRE",
            "event_slug": "west_ham-tottenham-1401290",
            "start": "1399117500",
            "home_team": "West Ham",
            "home_team_phid": null,
            "home_team_logo": "\/\/dxnxhx88pdxyv.cloudfront.net\/logo\/32\/t523.png",
            "home_team_short": "",
            "away_team": "Tottenham",
            "away_team_phid": null,
            "away_team_logo": "\/\/dxnxhx88pdxyv.cloudfront.net\/logo\/32\/t498.png",
            "away_team_short": "",
            "phid": null
        }, {
            "id": "64711",
            "code": "SOCENGPRE",
            "event_slug": "manchester_u-sunderland-1401286",
            "start": "1399125600",
            "home_team": "Manchester U",
            "home_team_phid": null,
            "home_team_logo": "\/\/dxnxhx88pdxyv.cloudfront.net\/logo\/32\/t20790.png",
            "home_team_short": "Man U",
            "away_team": "Sunderland",
            "away_team_phid": null,
            "away_team_logo": "\/\/dxnxhx88pdxyv.cloudfront.net\/logo\/32\/t382.png",
            "away_team_short": "",
            "phid": null
        }, {
            "id": "64712",
            "code": "SOCENGPRE",
            "event_slug": "stoke-fulham-1401288",
            "start": "1399125600",
            "home_team": "Stoke",
            "home_team_phid": null,
            "home_team_logo": "\/\/dxnxhx88pdxyv.cloudfront.net\/logo\/32\/t389.png",
            "home_team_short": "",
            "away_team": "Fulham",
            "away_team_phid": null,
            "away_team_logo": "\/\/dxnxhx88pdxyv.cloudfront.net\/logo\/32\/t379.png",
            "away_team_short": "",
            "phid": null
        }]
    }
}

My objective is to retrieve the fixture ID along with the two competing teams. Can you point out what I might be doing incorrectly?

javascriptajaxjson

Answer №1

To optimize performance, utilize the code snippet below without re-parsing the JSON object since it is already processed and stored as a string.

At the beginning of your script, initialize the variable "result" as an empty array:

var result = [];


function retrieveUpcomingMatches() {
  $.each( string , function ( index , value) {

     $.each( value['fixtures'] , function ( key , fixtureData) {

      result.push( { id: fixtureData.id , 
                     hometeam : fixtureData.home_team , 
                     awayteam : fixtureData.away_team
                    } 
                  );
      });

  });
}

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