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put text in a selecting state

This snippet is used to put the text of an element in a selection state. Change the following value.

  • targetSelector: A string of a selector to specify the element
var targetSelector = "<TODO: REPLACE SELECTOR>";

/* --------- Anything below this does not need to be changed. ---------- */
var targetElement = document.querySelector(targetSelector);

if (!targetElement) {
  throw new Error("Element not found");

/* Select the text of an element */
selectRange(targetElement, 0, targetElement.textContent.length);

function selectRange(element, startAt, endAt) {
  var selection = window.getSelection();
  var range = document.createRange();
  var textNode = element.childNodes[0];
  range.setStart(textNode, startAt);
  range.setEnd(textNode, endAt);
  if (selection.rangeCount > 0) {