Selection and Range

Range

let range = new Range();
<p id="p:st">Example: <i>italic</i> and <b>bold</b></p>

let range = new Range();
let p = window['p:st'];

range.setStart(p,0);
range.setEnd(p,2);
console.log(range);

document.getSelection().addRange(range);

range.setEnd(p, 2) p요소노드의 2번 바로앞까지를 설정

<p id="p">Example: <i>italic</i> and <b>bold</b></p>

From <input id="start" type="number" value=1> – To <input id="end" type="number" value=4>
<button id="button">Click to select</button>
<script>
  button.onclick = () => {
    let range = new Range();

    range.setStart(p, start.value);
    range.setEnd(p, end.value);

    // apply the selection, explained later
    document.getSelection().removeAllRanges();
    document.getSelection().addRange(range);
  };
</script>

<p id="p">Example: <i>italic</i> and <b>bold</b></p>

<p id="result"></p>
<script>
  let range = new Range();

  // Each demonstrated method is represented here:
  let methods = {
    deleteContents() {
      range.deleteContents()
    },
    extractContents() {
      let content = range.extractContents();
      result.innerHTML = "";
      result.append("extracted: ", content);
    },
    cloneContents() {
      let content = range.cloneContents();
      result.innerHTML = "";
      result.append("cloned: ", content);
    },
    insertNode() {
      let newNode = document.createElement('u');
      newNode.innerHTML = "NEW NODE";
      range.insertNode(newNode);
    },
    surroundContents() {
      let newNode = document.createElement('u');
      try {
        range.surroundContents(newNode);
      } catch(e) { alert(e) }
    },
    resetExample() {
      p.innerHTML = `Example: <i>italic</i> and <b>bold</b>`;
      result.innerHTML = "";

      range.setStart(p.firstChild, 2);
      range.setEnd(p.querySelector('b').firstChild, 3);

      window.getSelection().removeAllRanges();
      window.getSelection().addRange(range);
    }
  };

  for(let method in methods) {
    document.write(`<div><buttontoken interpolation">${method}()">${method}</button></div>`);
  }

  methods.resetExample();
</script>

Selection

<p id="p">Select me: <i>italic</i> and <b>bold</b></p>

From <input id="from" disabled> – To <input id="to" disabled>
<script>
  document.onselectionchange = function() {
    let {anchorNode, anchorOffset, focusNode, focusOffset} = document.getSelection();

    from.value = `${anchorNode && anchorNode.data}:${anchorOffset}`;
    to.value = `${focusNode && focusNode.data}:${focusOffset}`;
  };
</script>

<p id="p">Select me: <i>italic</i> and <b>bold</b></p>

Cloned: <span id="cloned"></span>
<br>
As text: <span id="astext"></span>

<script>
  document.onselectionchange = function() {
    let selection = document.getSelection();

    cloned.innerHTML = astext.innerHTML = "";

    // Clone DOM nodes from ranges (we support multiselect here)
    for (let i = 0; i < selection.rangeCount; i++) {
      cloned.append(selection.getRangeAt(i).cloneContents());
    }

    // Get as text
    astext.innerHTML += selection;
  };
</script>