Jt.rerun

Rerun the script immediately.

When Jt.rerun() is called, Javelit halts the current app run and executes no further statements. Javelit immediately queues the script to rerun. In a multipage app: by default, the rerun is for the same url path (same page). If the rerun could make the current page unavailable, pass toHome = true to send back to the home url and avoid 404 errors.

Method Signatures and Parameters

Jt.rerun(boolean toHome)

toHome (boolean)

If true, rerun in / url path. If false, rerun in current path.

Jt.rerun()

Examples

Updating session state and triggering rerun 

import io.javelit.core.Jt;

public class RerunApp {
  public static void main(String[] args) {
    Jt.sessionState().computeIfAbsent("value", k -> "Title");

    // Display current value
    Jt.title(Jt.sessionState().getString("value")).use();

    if (Jt.button("Foo").use()) {
      Jt.sessionState().put("value", "Foo");
      Jt.rerun(false);
    }
  }
}

Caveats for Jt.rerun

Jt.rerun is one of the tools to control the logic of your app. While it is great for prototyping, there can be adverse side effects:

  • Additional app runs may be inefficient and slower.
  • Excessive reruns may complicate your app's logic and be harder to follow.
  • If misused, infinite looping may crash your app.

In many cases where Jt.rerun works, callbacks may be a cleaner alternative. Containers may also be helpful.

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