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 - http://dummy.restapiexample.com/api/v1/employees, 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">
5. <oj-table id='table' aria-label='Departments Table'
6. data='[[datasource]]'
7. selection-mode='{"row": "multiple", "column": "multiple"}'
8. dnd='{"reorder": {"columns": "enabled"}}'
9. scroll-policy='loadMoreOnScroll'
10. scroll-policy-options='{"fetchSize": 10}'
11. columns='[{"headerText": "ID",
12. "field": "emp_id",
13. "resizable": "enabled"},
15. {"headerText": "Name",
16. "field": "emp_name",
17. "resizable": "enabled"},
19. {"headerText": "Salary",
20. "field": "emp_sal",
21. "resizable": "enabled"},
23. {"headerText": "Age",
24. "field": "emp_age",
25. "resizable": "enabled"}
26. ]'
27. style='width: 100%; height: 400px;'>
28. </oj-table>
30. </div>
31. </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, $) {
6. function DashboardViewModel() {
7. var self = this;
8. //Define a Knockout observable array and name it tabData
9. self.tabData = ko.observableArray();
11. //Use jQuery method to call REST Web Service
12. $.getJSON("http://dummy.restapiexample.com/api/v1/employees").then(function (employees) {
13. $.each(employees, function () {
14. //Push data in Observable array
15. self.tabData.push( {
16. emp_id : this.id,
17. emp_name : this.employee_name,
18. emp_sal : this.employee_salary,
19. emp_age : this.employee_age
20. });
21. });
22. });
24. //Pass observable array in utility class to show data in table
25. self.datasource = new oj.ArrayTableDataSource(self.tabData,
26. {
27. idAttribute : 'emp_id'
28. });
29. .
30. .
31. .

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

Working with Oracle JET Chart Component

 In this post, we'll see how to use Oracle JET Chart (oj-chart) Component and its various properties, Here I am using Oracle JET with JDeveloper 12.1.3. To learn more about using JET with JDeveloper refer my previous post

Goto Oracle JET Cookbook and read the whole recipe of Bar Chart, Here you'll learn about basic properties of a chart

Now open the dashboard.html file from your project in JDeveloper editor and paste this code

1. <div class="oj-hybrid-padding">
2. <h1>Dashboard Content Area</h1>
3. <div>
4. <oj-chart
5. id="barChart"
6. type="bar"
7. orientation="[[orientationValue]]"
8. stack="[[stackValue]]"
9. series="[[barSeriesValue]]"
10. groups="[[barGroupsValue]]"
11. animation-on-display="auto"
12. animation-on-data-change="auto"
13. hover-behavior="dim"
14. style="max-width:650px;width:100%;height:350px;">
15. </oj-chart>
16. </div>
17. </div>

Here you can see orientation, stack, series, groups values are referenced from different variables and these variables are used in the dashboard.js file to supply values to the chart components.

1. /*
2. * Your dashboard ViewModel code goes here
3. */
4. define(['ojs/ojcore', 'knockout', 'jquery', 'ojs/ojchart'],
5. function (oj, ko, $) {
7. function DashboardViewModel() {
8. var self = this;
10. /*Chart Properties*/
11. self.stackValue = ko.observable('off');
12. self.orientationValue = ko.observable('vertical');
14. /* chart data */
15. var barSeries = [
16. {name : "Finance", items : [42000, 55000]},
17. {name : "Purchase", items : [55000, 70000]},
18. {name : "Service", items : [36000, 50000]},
19. {name : "Administration", items : [28000, 65000]},
20. {name : "HR", items : [25000, 60000]}
21. ];
23. var barGroups = ["Average Salary", "Max Salary"];
25. self.barSeriesValue = ko.observableArray(barSeries);
26. self.barGroupsValue = ko.observableArray(barGroups);
27. .
28. .
29. .

Here you can see that an array is used to populate data in the bar chart and all variables are defined with appropriate values, You can see that we have two groups here for each Department and chart orientation is vertical.

Now run and check how it looks on the browser

Try changing stackValue and orientationValue attribute and check what happens?

1. /*Chart Properties*/
2. self.stackValue = ko.observable('on');
3. self.orientationValue = ko.observable('horizontal');

and bar chart looks like this

Now I am adding a choice list that shows different chart type and on the selection of specific type, the chart should change so for this requirement I am adding an oj-select-one component on the page and referencing chart's type attribute to its value

This is the complete code of the dashboard.html

1. <div class="oj-hybrid-padding">
2. <h1>Dashboard Content Area</h1>
3. <div>
4. <oj-label for="basicSelect">Select Chart Type</oj-label>
6. <oj-select-one id="basicSelect" value="{{chartType}}" style="max-width:20em">
7. <oj-option value="bar">Bar</oj-option>
8. <oj-option value="pie">Pie</oj-option>
9. <oj-option value="line">Line</oj-option>
10. <oj-option value="area">Area</oj-option>
11. </oj-select-one>
13. <oj-chart
14. id="barChart"
15. type="[[chartType]]"
16. orientation="[[orientationValue]]"
17. stack="[[stackValue]]"
18. series="[[barSeriesValue]]"
19. groups="[[barGroupsValue]]"
20. animation-on-display="auto"
21. animation-on-data-change="auto"
22. hover-behavior="dim"
23. style="max-width:650px;width:100%;height:350px;">
24. </oj-chart>
25. </div>
26. </div>

and the dashboard.js file looks like this

1. /*
2. * Your dashboard ViewModel code goes here
3. */
4. define(['ojs/ojcore', 'knockout', 'jquery', 'ojs/ojchart','ojs/ojselectcombobox'],
5. function (oj, ko, $) {
7. function DashboardViewModel() {
8. var self = this;
10. //Setting choice list attribute
11. this.chartType = ko.observable("bar");
13. /*Chart Properties*/
14. self.stackValue = ko.observable('off');
15. self.orientationValue = ko.observable('vertical');
17. /* chart data */
18. var barSeries = [
19. {name : "Finance", items : [42000, 55000]},
20. {name : "Purchase", items : [55000, 70000]},
21. {name : "Service", items : [36000, 50000]},
22. {name : "Administration", items : [28000, 65000]},
23. {name : "HR", items : [25000, 60000]}
24. ];
26. var barGroups = ["Average Salary", "Max Salary"];
28. self.barSeriesValue = ko.observableArray(barSeries);
29. self.barGroupsValue = ko.observableArray(barGroups);
30. .
31. .
32. .

Now run and try changing chart type from the choice list

Oracle JET Line Chart

Oracle JET Area Chart

You can download the Sample Oracle JET Application here, its approx 13mb as JET library filed are included in the project

Cheers 🙂 Happy Learning