How to find cursor position in a contenteditable DIV?

问题:

I am writing a autocompleter for a content editable DIV (need to render html content in the text box. So preferred to use contenteditable DIV over TEXTAREA). Now I need to find the cursor position when there is a keyup/keydown/click event in the DIV. So that I can insert the html/text at that position. I am clueless how I can find it by some computation or is there a native browser functionality that would help me find the cursor position in a contententeditable DIV.

回答1:

If all you want to do is insert some content at the cursor, there's no need to find its position explicitly. The following function will insert a DOM node (element or text node) at the cursor position in all the mainstream desktop browsers:

function insertNodeAtCursor(node) {     var range, html;     if (window.getSelection && window.getSelection().getRangeAt) {         range = window.getSelection().getRangeAt(0);         range.insertNode(node);     } else if (document.selection && document.selection.createRange) {         range = document.selection.createRange();         html = (node.nodeType == 3) ? node.data : node.outerHTML;         range.pasteHTML(html);     } }

If you would rather insert an HTML string:

function insertHtmlAtCursor(html) {     var range, node;     if (window.getSelection && window.getSelection().getRangeAt) {         range = window.getSelection().getRangeAt(0);         node = range.createContextualFragment(html);         range.insertNode(node);     } else if (document.selection && document.selection.createRange) {         document.selection.createRange().pasteHTML(html);     } }

UPDATE

Following the OP's comments, I suggest using my own Rangy library, which adds a wrapper to IE TextRange object that behaves like a DOM Range. A DOM Range consists of a start and end boundary, each of which is expressed in terms of a node and an offset within that node, and a bunch of methods for manipulating the Range. The MDC article should provide some introduction.

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