JetBrains Rider 2017.2 Help

Live Editing of HTML, CSS, and JavaScript

In this section:


During a JavaScript debugging session, you can monitor how the changes you make in the HTML file are rendered in the actual browser window without refreshing the page manually and even without leaving JetBrains Rider. All the changes you make are immediately reflected in the browser and the affected area is highlighted. Besides pure HTML files, this also works for other file types that contain or generate HTML, CSS, or JavaScript. You just need to specify the URL of the page in the JavaScript Debug run configuration. The live contents of the page being edited are shown in the Elements tab of the Debug tool window.

Currently the Live Edit functionality is supported only for Google Chrome and only during a debugging session.

Before you start

Configuring the Live Edit update policy in the debugging mode

In the debugging mode, JetBrains Rider provides the Live Edit functionality which supports both automatic and manual upload of updated files on the server side. For the client side, Live Edit does not provide any way to apply the changes.

In Meteor projects, the client-side code can be updated through the native Meteor hot code pushes functionality.

To configure the Live Edit update policy in the debugging mode

  1. Open the Settings/Preferences by pressing Ctrl+Alt+S or by choosing File | Settings for Windows and Linux or JetBrains Rider | Preferences for macOS. Expand the Debugger node under Build, Execution, Deployment, and then click Live Edit. The Live Edit page opens.
  2. In the Update area, configure the way changes made to the code during a debugging session are applied. Note that an update will now be performed only if none of the modified files have any syntax errors.
    • Auto in (ms): Choose this option to have the changes applied automatically at certain time interval and specify the delay in ms in the text box. This policy is not available for the client-side code of Meteor applications.
    • Manual: Choose this option to apply the changes manually by clicking the Update <run configuration name> JavaScript button update icon or the Update <run configuration name> button update icon on the toolbar of the Debug tool window.

      It is recommended that you choose this option for debugging Meteor applications because applying changes to the client-side code is not supported.

    • Restart if hotswap fails:

      With changes in HTML, CSS, and JavaScript on the client side, the contents of a Web page in the browser are updated without reloading. For Node.js or Meteor applications, JetBrains Rider first tries to update the application incorporating the changes without restarting the Node.js server.

      • Select this check box to have JetBrains Rider try restarting the server if the changes cannot be applied automatically. After the restart, JetBrains Rider brings you to the execution point where the problem took place.

        If even with this option chosen automatic upload still fails, tou will have to restart the server manually by clicking the Rerun <run configuration name> button run.

      • When the check box is cleared, JetBrains Rider just displays a pop-up window informing you about the failure and suggesting to restart the server manually.

Live Editing during a debugging session

Live Editing is enabled automatically, no steps are required from your side to activate it.

To perform Live Editing during a debugging session

  1. When editing the code and monitoring how the changes are rendered in the browser, it is helpful to have the areas affected by the changes highlighted. To enable highlighting for the affected areas, open the Build, Execution, Deployment | Debugger | - Live Edit page of JetBrains Rider settings (Ctrl+Alt+S), and then select Highlight current element in browser.

  2. To initiate a debugging session, create a run configuration of the type JavaScript Debug and click the Debug button debug on the toolbar. JetBrains Rider establishes connection with the JetBrains Chrome extension and starts a debugging session.
  3. Edit the HTML file that implements the page opened in the browser and view the changes immediately rendered.

JetBrains Rider supports an operation that is somehow opposite to live editing. During a debugging session, the Elements tab of the Debug tool window shows the HTML source code that implements the actual browser page and its HTML DOM structure. Moreover, any changes made to the page through the browser are immediately reflected in the Elements tab. For more details, see Viewing Actual HTML DOM.

Last modified: 27 December 2017