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Wednesday 10 April 2019

Populate Oracle JET table from JSON based REST Web Service

 Before starting with this post first go through my previous post about using JET with JDeveloper. Here I am using the same JET nav drawer template application. In this post, we'll see how to consume JSON based REST Web Service and populate data in the Oracle JET table (oj-table) component

We have the URL of REST Web Service -, it returns a list of employees and their details.

Let's see the implementation part

Add an oj-table component in the dashboard.html page and define the required number of columns, this web service returns multiple details of an Employee so I have taken 4 columns for Id, Name, Salary, and Age

  1. <div class="oj-hybrid-padding">
  2. <h1>Dashboard Content Area</h1>
  3. <div id="div1">
  4. <oj-table id='table' aria-label='Departments Table'
  5. data='[[datasource]]'
  6. selection-mode='{"row": "multiple", "column": "multiple"}'
  7. dnd='{"reorder": {"columns": "enabled"}}'
  8. scroll-policy='loadMoreOnScroll'
  9. scroll-policy-options='{"fetchSize": 10}'
  10. columns='[{"headerText": "ID",
  11. "field": "emp_id",
  12. "resizable": "enabled"},
  13. {"headerText": "Name",
  14. "field": "emp_name",
  15. "resizable": "enabled"},
  16. {"headerText": "Salary",
  17. "field": "emp_sal",
  18. "resizable": "enabled"},
  19. {"headerText": "Age",
  20. "field": "emp_age",
  21. "resizable": "enabled"}
  22. ]'
  23. style='width: 100%; height: 400px;'>
  24. </oj-table>
  25. </div>
  26. </div>

Now see the code of dashboard.js, Read comments to understand the javascript code, Here getJSON() method of jQuery is used to call REST Web Service as jQuery is a part of Oracle JET libraries.

  1. /*
  2. * Your dashboard ViewModel code goes here
  3. */
  4. define(['ojs/ojcore', 'knockout', 'jquery', 'ojs/ojinputtext', 'ojs/ojtable', 'ojs/ojarraytabledatasource'], function (oj, ko, $) {
  5. function DashboardViewModel() {
  6. var self = this;
  7. //Define a Knockout observable array and name it tabData
  8. self.tabData = ko.observableArray();
  9. //Use jQuery method to call REST Web Service
  10. $.getJSON("").then(function (employees) {
  11. $.each(employees, function () {
  12. //Push data in Observable array
  13. self.tabData.push( {
  14. emp_id :,
  15. emp_name : this.employee_name,
  16. emp_sal : this.employee_salary,
  17. emp_age : this.employee_age
  18. });
  19. });
  20. });
  21. //Pass observable array in utility class to show data in table
  22. self.datasource = new oj.ArrayTableDataSource(self.tabData,
  23. {
  24. idAttribute : 'emp_id'
  25. });
  26. .
  27. .
  28. .

tabData is a knockout observable array that is defined to hold returned value and you can see that self.tabData.push is used to push web service data into this array and at last a JET utility class ArrayTableDataSource is used to convert this observable array in tabular format data.

Here id, employee_name, employee_salary, employee_age are the attribute's names returned by Web Service in JSON format.

Now right click on the index.html file in JDeveloper and choose run

and see Oracle JET table in the browser, Data is populated from Web Service. In the same way, you can try some other Web Service URLs.

All Done :)

Cheers 🙂 Happy Learning

Read more about Oracle JET Components

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