EditContext: updateControlBounds() method

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The EditContext.updateControlBounds() method of the EditContext interface is used to inform the operating system about the position and size of the editable text region of the EditContext object.

Call this method to tell the operating system the bounds of the current editable region. You should call it when initializing the EditContext, and whenever the editable region's bounds change such as when the webpage is resized. These bounds are used to position platform-specific editing-related UI surfaces such as an Input Method Editor (IME) window.

Syntax

updateControlBounds(controlBounds)

Parameters

controlBounds: A DOMRect object representing the new control bounds.

Exceptions

If no argument is provided, a TypeError DOMException is thrown.
If the provided argument is not a DOMRect a TypeError DOMException is thrown.

Examples

Updating the control bounds when the editor is initialized and on window resize

This example shows how to use the updateControlBounds() method to tell the platform where the editable region is at all times.

css

#editor {
  border: 1px solid black;
  height: 50vw;
  width: 50vh;
}

html

<div id="editor"></div>

const editorEl = document.getElementById("editor");
const editContext = new EditContext();
editorEl.editContext = editContext;

function updateControlBounds() {
  const editorBounds = editorEl.getBoundingClientRect();
  editContext.updateControlBounds(editorBounds);
  console.log(
    `Updated control bounds to ${editorBounds.x}, ${editorBounds.y}, ${editorBounds.width}, ${editorBounds.height}`,
  );
}

// Update the control bounds now.
updateControlBounds();
// And when the page is resized.
window.addEventListener("resize", updateControlBounds);

Specifications

Specification
EditContext API # dom-editcontext-updatecontrolbounds

Browser compatibility

BCD tables only load in the browser