How to Maintain Cursor Position in a ContentEditable ``?-JS Tutorial-php.cn

How to Maintain Cursor Position in a ContentEditable ``?

Barbara Streisand

Release： 2024-11-12 08:59:02

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How to Maintain Cursor Position in a ContentEditable ``?

Maintain Cursor Position in a ContentEditable

When working with content editable

elements, it's often desirable to retain the cursor position after the element regains focus. By default, browsers typically reset the cursor to the beginning of the text upon re-focus.

Solution Overview

To solve this issue, we store the current cursor position when the div loses focus and restore it when it regains focus. Here's an implementation that works across major browsers:

var savedRange; // Variable to store the saved selection
var isInFocus; // Flag to track focus state

function saveSelection() {
  if (window.getSelection) {
    // Browser-specific logic to save the selected range
    savedRange = window.getSelection().getRangeAt(0);
  }
}

function restoreSelection() {
  isInFocus = true;
  document.getElementById("area").focus();

  if (savedRange != null) {
    // Browser-specific logic to restore the saved range
    if (window.getSelection) {
      var s = window.getSelection();
      s.removeAllRanges();
      s.addRange(savedRange);
    }
  }
}

// Optional code for selection restoration on click
function cancelEvent(e) {
  if (isInFocus == false && savedRange != null) {
    e.stopPropagation();
    e.preventDefault();
    restoreSelection();
  }
}

// Event handlers for saving and restoring selection
$(document).ready(function() {
  $("#area").focus(function() {
    isInFocus = true;
  });

  $("#area").blur(function() {
    isInFocus = false;
    saveSelection();
  });

  $("#area").mouseup(function() {
    saveSelection();
  });

  $("#area").keyup(function() {
    saveSelection();
  });

  $("#area").focusin(function() {
    restoreSelection();
  });

  // Optional event handlers for restoring selection on click
  $("#area").mousedown(function(e) {
    return cancelEvent(e);
  });

  $("#area").click(function(e) {
    return cancelEvent(e);
  });
});

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This solution covers both the restoration of the cursor position upon re-focus and the optional behavior of restoring the selection on click. It is compatible with all major browsers and provides a definitive solution to the problem of losing cursor position in a content editable

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