JSON Data Source


Apps - Datasource - JSON icon.png This type of data source belongs to the Files category in the data source library. It is used to retrieve static content from JSON files (JavaScript Object Notation) located on the local server. This is a structured text data format understood by JavaScript.

Notes

   Open url.png  see General remarks on data sources

  • The data from the data source is not automatically refreshed.
    • The app administrator must upload the JSON file again to update the data.
    • If data changes on a regular basis, then you should use an online JSON dynamic data source.
  • To find out more about the file structure, please consult http://www.json.org.

Example

You want to retrieve the characteristics of different processors from a JSON file.

The JSON file contains two sections:

  • The column section: Indicates the title and properties of columns in the data source. Each column is delimited by curly brackets { }. 
  • The data section: Shows the values of the columns. Each row is delimited by square brackets [ ] representing one data source row.
Data source
EVApps - datasource JSON - Example Datasource.png

Download Zip icon.png Download Example (JSON file)

Open url.png   see Content

{
    "columns": [
          {
         "fieldname": "title",
         "label": "CPU",
         "colIdx": 0,
         "xtype": "string",
         "access": "read"
          },

          {
         "fieldname": "AnotherField",
         "label": "Unit",
         "colIdx": 1,
         "xtype": "string",
         "access": "read"
          },

          {
         "fieldname": "Value",
         "label": "Value",
         "colIdx": 2,
         "xtype": "string",
         "access": "read"
          },

          {
         "fieldname": "LastValue",
         "label": "Last Value",;
         "colIdx": 3,;
         "xtype": "string",;
         "access": "read";
          }
     ],

    "datas": [
          ["CPU 1","GHz","1031","700"],
          ["CPU 2","MHz","2066","650"],
          ["CPU 3","GHz","3033","833"],
          ["CPU 4","GHz","1031","700"]
     ]
}

List of properties

Content

Last Modified Uploaded File: The date on which the JSON file was last uploaded.

Choose a File: Used to select the JSON file using the Open dialog box. Note: You can also select the file using a drag and drop.

Preview

Configure Field Types: Used to display a preview of the structure and data from the data source via a data editor. 

  • The button Apps - datasources Properties - Preview button.png displayed below the property indicates the number of extracted rows (up to a limit of 15) and columns. Click on it to open the editor. Open url.png See the Description.
  • The button will display No data available as long as you have not selected any of the mandatory elements of the data source.
  • In edit mode, only the first 15 data source records are displayed.
  • In execute mode, all of the data source records are displayed.
  • Data in static data sources comes from the last file upload.
  • Data in dynamic data sources is updated when you open the app in edit mode.
AutoRefresh

Auto Refresh (Note: Only for dynamic data sources): Used to indicate the automatic refreshment interval for a dynamic data source. The frequency is expressed in hours/minutes. The updating of data is done in execute mode or edit mode, each time the app is run and each time the page is redisplayed.

    Best Practice icon.png

  • Because the updating of data requires additional activity on the EasyVista Service Apps platform, you should define an automatic refreshment interval only if the app is required to constantly display  real-time data for long periods of time on a screen.
             Example documentation icon EN.png  Dashboards
  • You should not define an automatic refreshment interval if the app is only used for displaying a snapshot of data for short periods of time.
             Example documentation icon EN.png  A portal for consulting catalogs
SelectFirstRowAsCurrentRecord

Select First Row As Current Record: Used to indicate if the first record of the data source, when displayed in widgets, is selected by default (box is checked) or if no record is selected by default (box is not checked). 

NoDataMessage

No Data Message: Message displayed when no data is returned in the data source. Enter the code directly in the field or click Apps - Edit Html icon.png to open the text editor

Tags:
Last modified by Unknown User on 2017/09/01 16:47
Created by Administrator XWiki on 2014/11/12 20:38

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