Utilizing Knockout to Load JSON Data in DevExtreme

Question

Utilizing Knockout to Load JSON Data in DevExtreme

As a newcomer to both javascript and devextreme, I am currently navigating my way through. I successfully created a webpage that loads a json file, but I'm facing challenges implementing it using devextreme.

I have a dxDataGrid where I intend to display the data. The data is correctly displayed when using a .js file. Here is a snippet from my json file:


        {
          "user": [
            {
              "id": 0,
              "name": "user0",
              "mail": "example0@example.com",
              "address": "examplestreet 0",
              "zip": "12345",
              "city": "examplecity",
              "country": "examplecountry",
              "dayOfBirth": "1990/01/01"
            },
            {
              "id": 1,
              "name": "user1",
              "mail": "example1@example.com",
              "address": "examplestreet 1",
              "zip": "23456",
              "city": "examplecity",
              "country": "examplecountry",
              "dayOfBirth": "1990/01/01"
            },
            {
              "id": 2,
              "name": "user2",
              "mail": "example2@example.com",
              "address": "examplestreet 2",
              "zip": "34567",
              "city": "examplecity",
              "country": "examplecountry",
              "dayOfBirth": "1990/01/01"
            }
          ]
        }

I have tried to load the json file using the following code. While the object is correctly displayed in Google Chrome's developer tools, I'm having trouble loading it into the dxDataGrid.

Thank you in advance for any guidance!

javascript json knockout.js devextreme

Answer 1

Answer №1

To ensure compatibility with dxDataGrid, it is recommended that the "getData()" method returns a promise. Here is an example implementation:

var getData = function () {
    var deferred = $.Deferred();
    var xmlhttp = new XMLHttpRequest(),
                        json;
    xmlhttp.onreadystatechange = function() {
        if(xmlhttp.readyState === 4 && xmlhttp.status === 200) {
            json = JSON.parse(xmlhttp.responseText);
            console.log(json);
            //return json;
            deferred.resolve(json); // json should be array here
        }
    };              

    xmlhttp.open('GET', 'data.json', true);
    xmlhttp.send();

    return deferred.promise();
};

It is important to note that DevExtreme is designed to work with JQuery promises. Other promise libraries may not be supported.

Update 1

If you are getting an array of arrays, simply retrieve the first element:

deferred.resolve(json[0]); // json should be array here

Answer 2

To ensure compatibility with dxDataGrid, it is recommended that the "getData()" method returns a promise. Here is an example implementation:

var getData = function () {
    var deferred = $.Deferred();
    var xmlhttp = new XMLHttpRequest(),
                        json;
    xmlhttp.onreadystatechange = function() {
        if(xmlhttp.readyState === 4 && xmlhttp.status === 200) {
            json = JSON.parse(xmlhttp.responseText);
            console.log(json);
            //return json;
            deferred.resolve(json); // json should be array here
        }
    };              

    xmlhttp.open('GET', 'data.json', true);
    xmlhttp.send();

    return deferred.promise();
};

It is important to note that DevExtreme is designed to work with JQuery promises. Other promise libraries may not be supported.

Update 1

If you are getting an array of arrays, simply retrieve the first element:

deferred.resolve(json[0]); // json should be array here

Utilizing Knockout to Load JSON Data in DevExtreme

Answer №1

Update 1

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