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Showing content from https://webplatform.github.io/docs/dom/TextRange/moveToPoint below:

moveToPoint · WebPlatform Docs

moveToPoint Summary

Moves the start and end positions of the text range to the given point.

Syntax

var result = textRange.moveToPoint();

Parameters x

Data-type: Number

Integer that specifies the horizontal offset relative to the upper-left corner of the window, in pixels.

Data-type: Number

Integer that specifies the vertical offset relative to the upper-left corner of the window, in pixels.

Return Value

Returns an object of type NumberNumber

Type: HRESULT

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Examples

This example uses the moveToPoint method to move the text range to the point where the user clicked the mouse, expands the range, and selects the text within the new range.

<SCRIPT FOR=document EVENT=onclick LANGUAGE="JScript">
    var rng = document.body.createTextRange();
    rng.moveToPoint(window.event.x, window.event.y);
    rng.expand("word");
    rng.select();
</SCRIPT>

The following example moves the caret in harmony with the mouse as it moves over a contenteditable div element.

<!DOCTYPE html>
<html>
<head>
  <title>moveToPoint example</title>
</head>
<body>
  <div contenteditable="true" onmousemove="followMouse()">
    Move the mouse over this text, the caret will follow it.
  </div>
  <script type="text/javascript">
    function followMouse() {
      if (document.body.createTextRange) {
        var range = document.body.createTextRange();

        range.moveToPoint(event.clientX, event.clientY);
        range.select();
      }
    }
  &lt/script>
</body>
</html>

Notes Remarks

The coordinates of the point must be in pixels and be relative to the upper-left corner of the window. The resulting text range is empty, but you can expand and move the range using methods such as expand and moveEnd. This feature might not be available on non-Microsoft Win32 platforms.

Attributions

Microsoft Developer Network: [moveToPoint Method Article]

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