Client Side

Client Tools

A browser is a universal client used by all users working with the platform and the integrated applications. For testing and debugging, you will most probably need development tools, also known as debugging tools, plugged into your browser. Sometimes it is necessary to send a direct REST request to the APS controller. For this purpose, use a REST client as explained in Using APS REST API.

Debugging Tools in Browser

Follow the recommendations on activating the debugging tools on your browser. The examples in this document are based on using the Chrome browser and its embedded Chrome DevTools.

To disable cache in Chrome:

1. In the browser, open Developer Tools.

2. In the Developer Tools screen, open Settings.

3. Tick the Disable cache (while DevTools is Open) checkbox.

4. Close Developer Tools.

If you experience any issues with a custom UI in a console, activate the development tools.

Typically, a developer uses the following tools:

• Console tab to find error messages and your custom messages, as well as to run commands on the fly

• Network tab to check REST requests and analyze them

• Elements tab to view the HTML code and change element on the fly

• Source tab to view HTML and JavaScript source code, set breakpoints, and analyze data on the fly

• Mobile switch to switch to mobile mode in order to verify how the UI will look on mobile screens

Console Log Methods

You can print out some data in the debugger console using the following methods in JavaScript.

• Print out strings or integers using a set of console log commands. You can differentiate them by severity as explained in Dojo debugging tutorial .

  console.log("For your information");               // The method is used most often
  console.debug("To make sure nothing happened");
  console.info("Something might happen");
  console.warn("Something happened, but it's not a big deal");
  console.error("It's a real problem!");             // You have to fix the problem ASAP
  

• Print more complex contents, such as objects and arrays, using the console.dir() function as explained in Dojo debugging tutorial :

  console.dir([
      {attribute: "last_name", sortDescending: true},
      {fruits: ["apple", "orange", "pear"], sortDescending: true}
  ]);
  

• Use console.group(), console.groupCollapsed(), and console.groupEnd() to collect messages printed by console log commands into a folder or a hierarchy of folders for your convenience as explained in Diagnose and Log to Console .

  var user = "jsmith", authenticated = true, authorized = true;
  // Start top-level group
  console.group("Authenticating user '%s'", user);
  if (authenticated) {
       console.log("User '%s' was authenticated", user);
       // Start nested group
       console.group("Authorizing user '%s'", user);
       if (authorized) {
           console.log("User '%s' was authorized.", user);
       }
       // End nested group
       console.groupEnd();
  }
  // End top-level group
  console.groupEnd();
  

Breakpoints, Data Watch, and Console Commands

In the debugger window, you can set breakpoints in the JavaScript code. At each breakpoint, the debugger will stop JavaScript execution and let you examine necessary values:

While the code is stopped by the debugger, you can run commands in the console, for example, to check a widget property or a whole widget:

After examining the code and values, you can resume the execution of code, typically with the play button.

You can also use the legal JavaScript debugger; statement. It can be used only when the debugger (for example Chrome DevTools) is active. In this case, it stops the code execution the same way as you did by means of a breaking point set by the debugger UI tool.

debugger;
this.domNode.style.width = dojo.newWidth;

The advantage of this method is that breakpoints are set before the view is opened in the browser, whereas in the debugger UI you can do it only after the view is opened at least once.

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