Question

I’m working on a text editor. When the user double-clicks on a specific <div>, the contentEditable property is set to true and some editor tools appear. Then, the user can choose between clicking on “save” and “escape”. If he escapes, I want to restore the previous data in this <div>. So I copy data on first double-click (temp['htmlTxt']) and then:

$('#esc').click(function() {
    var confEsc = confirm('---\n\nSouhaitez-vous quitter sans enregistrer vos modifications ?\n\n---');

    if(confEsc) { 

       //Do you know why that works :
       var id = document.getElementById(temp['myId']);
       id.innerHTML = temp['htmlTxt'];

       //and why that doesn't work ?
       $('#'+temp['myId']).html(temp['htmlTxt'])
    }
});

I don’t understand why it works fine with classic JavaScript and not with jQuery…

Answer 1

Those 2 are practically identical. However jQuery does some pre-processing that might be getting in your way…

jQuery Globals

rnoInnerHtml = /<(?:script|style)/i;
rtagName = /<([\w:]+)/;
rleadingWhitespace = /^\s+/;
rxhtmlTag = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([\w:]+)[^>]*)\/>/gi;
wrapMap = {
    "option": [1, "<select multiple='multiple'>", "</select>"],
    "legend": [1, "<fieldset>", "</fieldset>"],
    "thead": [1, "<table>", "</table>"],
    "tr": [2, "<table><tbody>", "</tbody></table>"],
    "td": [3, "<table><tbody><tr>", "</tr></tbody></table>"],
    "col": [2, "<table><tbody></tbody><colgroup>", "</colgroup></table>"],
    "area": [1, "<map>", "</map>"],
    "_default": [0, "", ""],
    "optgroup": [1, "<select multiple='multiple'>", "</select>"],
    "caption": [1, "<table>", "</table>"],
    "colgroup": [1, "<table>", "</table>"],
    "tfoot": [1, "<table>", "</table>"],
    "tbody": [1, "<table>", "</table>"],
    "th": [3, "<table><tbody><tr>", "</tr></tbody></table>"]
};

.html(value) setter

var elem = this[0] || {},
    i = 0,
    l = this.length;

if (typeof value === "string" && !rnoInnerhtml.test(value) && 
    (jQuery.support.leadingWhitespace || !rleadingWhitespace.test(value)) && 
    !wrapMap[(rtagName.exec(value) || ["", ""])[1].toLowerCase()]) {

    value = value.replace(rxhtmlTag, "<$1></$2>");

    try {
        for (; i < l; i++) {
            // Remove element nodes and prevent memory leaks
            elem = this[i] || {};
            if (elem.nodeType === 1) {
                jQuery.cleanData(elem.getElementsByTagName("*"));
                elem.innerHTML = value;
            }
        }

        elem = 0;

        // If using innerHTML throws an exception, use the fallback method
    } catch(e) {}
}

if (elem) {
    this.empty().append(value);
}

that’s straight out of the current version for the setter on .html(string)

so basically if you value (1) isn’t a string, (2) has a script tag, (3) your on a browser that doesn’t support leading white-space and you string isn’t trimmed, (4) you tag falls into the wrapMap special use cases OR (5) innerHTML fails for ANY other reason.. THEN you are essentially calling .empty().append(value) which is a whole different ball of wax… -ck