Set caret position right after the inserted elemen

问题:

I'm inserting an element into a contentEditable div but the browser sets the position of the cursor before the inserted element. Is it possible to set the cursor right after the inserted element so that the user keeps typing without having to re-adjust the cursor position?

回答1:

The following function will do it. DOM Level 2 Range objects make this easy in most browsers. In IE, you need to insert a marker element after the node you're inserting, move the selection to it and then remove it.

Live example: http://jsfiddle.net/timdown/4N4ZD/

Code:

function insertNodeAtCaret(node) {
    if (typeof window.getSelection != "undefined") {
        var sel = window.getSelection();
        if (sel.rangeCount) {
            var range = sel.getRangeAt(0);
            range.collapse(false);
            range.insertNode(node);
            range = range.cloneRange();
            range.selectNodeContents(node);
            range.collapse(false);
            sel.removeAllRanges();
            sel.addRange(range);
        }
    } else if (typeof document.selection != "undefined" && document.selection.type != "Control") {
        var html = (node.nodeType == 1) ? node.outerHTML : node.data;
        var id = "marker_" + ("" + Math.random()).slice(2);
        html += '<span id="' + id + '"></span>';
        var textRange = document.selection.createRange();
        textRange.collapse(false);
        textRange.pasteHTML(html);
        var markerSpan = document.getElementById(id);
        textRange.moveToElementText(markerSpan);
        textRange.select();
        markerSpan.parentNode.removeChild(markerSpan);
    }
}

Alternatively, you could use my Rangy library. The equivalent code there would be

function insertNodeAtCaret(node) {
    var sel = rangy.getSelection();
    if (sel.rangeCount) {
        var range = sel.getRangeAt(0);
        range.collapse(false);
        range.insertNode(node);
        range.collapseAfter(node);
        sel.setSingleRange(range);
    }
}

回答2:

If you're inserting an empty div, p or span, I believe there needs to be "something" inside the newly created element for the range to grab onto -- and in order to put the caret inside there.

Here's my hack that seems to work OK in Chrome. The idea is simply to put a temporary string inside the element, then remove it once the caret is in there.

// Get the selection and range
var idoc = document; // (In my case it's an iframe document)
var sel = idoc.getSelection();
var range = sel.getRangeAt(0);

// Create a node to insert
var p = idoc.createElement("p"); // Could be a div, span or whatever

// Add "something" to the node.
var temp = idoc.createTextNode("anything");
p.appendChild(temp);
// -- or --
//p.innerHTML = "anything";

// Do the magic (what rangy showed above)
range.collapse(false);
range.insertNode( p );
range = range.cloneRange();
range.selectNodeContents(p);
range.collapse(false);
sel.removeAllRanges();
sel.addRange(range);

// Clear the non
p.removeChild(p.firstChild);
// -- or --
//p.innerHTML = "";

回答3:

Here's what worked for me, using Rangy, in a VueJS context.

// When the user clicks the button to open the popup to enter
// the URL, run this function to save the location of the user's
// selection and the selected text.
newSaveSel: function() {
  if (this.savedSel) {
    rangy.removeMarkers(this.savedSel);
  }
  // Save the location of the selected text
  this.savedSel = rangy.saveSelection();
  // Save the selected text
  this.savedSelText = rangy.getSelection().toString();
  this.showLinkPopup = true;
  console.log('newSavedSel', this.savedSel);
},
surroundRange: function() {
  // Restore the user's selected text. This is necessary since
  // the selection is lost when the user stars entering text.
  if (this.savedSel) {
    rangy.restoreSelection(this.savedSel, true);
    this.savedSel = null;
  }
  // Surround the selected text with the anchor element
  var sel = rangy.getSelection();

  var range = sel.rangeCount ? sel.getRangeAt(0) : null;
  if (range) {
    // Create the new anchor element
    var el = document.createElement("a");
    el.style.backgroundColor = "pink";
    el.href = this.anchorHref;
    el.innerHTML = this.savedSelText;
    if (this.checked) {
      el.target = "_blank";
    }
    // Delete the originally selected text
    range.deleteContents();
    // Insert the anchor tag
    range.insertNode(el);
    // Ensure that the caret appears at the end
    sel.removeAllRanges();
    range = range.cloneRange();
    range.selectNode(el);
    range.collapse(false);
    sel.addRange(range);
    this.showLinkPopup = false; 
  }
},