htmlarea_bak.php

很棒的在线教学系统

                replace(/<([a-z][a-z]*)> *<([a-z][^>]*)> *<\/\1>/gi,'<$2>');
        }
        D = D.replace(/<([a-z][a-z]*)><\1>/gi,'<$1>').
            replace(/<\/([a-z][a-z]*)><\/\1>/gi,'<\/$1>');

        // nuke double spaces
        D = D.replace(/  */gi,' ');

        this.setHTML(D);
        this.updateToolbar();
    }
};

HTMLArea.prototype.forceRedraw = function() {
    this._doc.body.style.visibility = "hidden";
    this._doc.body.style.visibility = "visible";
    // this._doc.body.innerHTML = this.getInnerHTML();
};

// focuses the iframe window.  returns a reference to the editor document.
HTMLArea.prototype.focusEditor = function() {
    switch (this._editMode) {
        case "wysiwyg" : this._iframe.contentWindow.focus(); break;
        case "textmode": this._textArea.focus(); break;
        default    : alert("ERROR: mode " + this._editMode + " is not defined");
    }
    return this._doc;
};

// takes a snapshot of the current text (for undo)
HTMLArea.prototype._undoTakeSnapshot = function() {
    ++this._undoPos;
    if (this._undoPos >= this.config.undoSteps) {
        // remove the first element
        this._undoQueue.shift();
        --this._undoPos;
    }
    // use the fasted method (getInnerHTML);
    var take = true;
    var txt = this.getInnerHTML();
    if (this._undoPos > 0)
        take = (this._undoQueue[this._undoPos - 1] != txt);
    if (take) {
        this._undoQueue[this._undoPos] = txt;
    } else {
        this._undoPos--;
    }
};

HTMLArea.prototype.undo = function() {
    if (this._undoPos > 0) {
        var txt = this._undoQueue[--this._undoPos];
        if (txt) this.setHTML(txt);
        else ++this._undoPos;
    }
};

HTMLArea.prototype.redo = function() {
    if (this._undoPos < this._undoQueue.length - 1) {
        var txt = this._undoQueue[++this._undoPos];
        if (txt) this.setHTML(txt);
        else --this._undoPos;
    }
};

// updates enabled/disable/active state of the toolbar elements
HTMLArea.prototype.updateToolbar = function(noStatus) {
    var doc = this._doc;
    var text = (this._editMode == "textmode");
    var ancestors = null;
    if (!text) {
        ancestors = this.getAllAncestors();
        if (this.config.statusBar && !noStatus) {
            this._statusBarTree.innerHTML = HTMLArea.I18N.msg["Path"] + ": "; // clear
            for (var i = ancestors.length; --i >= 0;) {
                var el = ancestors[i];
                if (!el) {
                    // hell knows why we get here; this
                    // could be a classic example of why
                    // it's good to check for conditions
                    // that are impossible to happen ;-)
                    continue;
                }
                var a = document.createElement("a");
                a.href = "#";
                a.el = el;
                a.editor = this;
                a.onclick = function() {
                    this.blur();
                    this.editor.selectNodeContents(this.el);
                    this.editor.updateToolbar(true);
                    return false;
                };
                a.oncontextmenu = function() {
                    // TODO: add context menu here
                    this.blur();
                    var info = "Inline style:\n\n";
                    info += this.el.style.cssText.split(/;\s*/).join(";\n");
                    alert(info);
                    return false;
                };
                var txt = el.tagName.toLowerCase();
                a.title = el.style.cssText;
                if (el.id) {
                    txt += "#" + el.id;
                }
                if (el.className) {
                    txt += "." + el.className;
                }
                a.appendChild(document.createTextNode(txt));
                this._statusBarTree.appendChild(a);
                if (i != 0) {
                    this._statusBarTree.appendChild(document.createTextNode(String.fromCharCode(0xbb)));
                }
            }
        }
    }
    for (var i in this._toolbarObjects) {
        var btn = this._toolbarObjects[i];
        var cmd = i;
        var inContext = true;
        if (btn.context && !text) {
            inContext = false;
            var context = btn.context;
            var attrs = [];
            if (/(.*)\[(.*?)\]/.test(context)) {
                context = RegExp.$1;
                attrs = RegExp.$2.split(",");
            }
            context = context.toLowerCase();
            var match = (context == "*");
            for (var k in ancestors) {
                if (!ancestors[k]) {
                    // the impossible really happens.
                    continue;
                }
                if (match || (ancestors[k].tagName.toLowerCase() == context)) {
                    inContext = true;
                    for (var ka in attrs) {
                        if (!eval("ancestors[k]." + attrs[ka])) {
                            inContext = false;
                            break;
                        }
                    }
                    if (inContext) {
                        break;
                    }
                }
            }
        }
        btn.state("enabled", (!text || btn.text) && inContext);
        if (typeof cmd == "function") {
            continue;
        }
        // look-it-up in the custom dropdown boxes
        var dropdown = this.config.customSelects[cmd];
        if ((!text || btn.text) && (typeof dropdown != "undefined")) {
            dropdown.refresh(this);
            continue;
        }
        switch (cmd) {
            case "fontname":
            case "fontsize":
            case "formatblock":
            if (!text) try {
                var value = ("" + doc.queryCommandValue(cmd)).toLowerCase();
                if (!value) {
                    // FIXME: what do we do here?
                    break;
                }
                // HACK -- retrieve the config option for this
                // combo box.  We rely on the fact that the
                // variable in config has the same name as
                // button name in the toolbar.
                var options = this.config[cmd];
                var k = 0;
                // btn.element.selectedIndex = 0;
                for (var j in options) {
                    // FIXME: the following line is scary.
                    if ((j.toLowerCase() == value) ||
                        (options[j].substr(0, value.length).toLowerCase() == value)) {
                        btn.element.selectedIndex = k;
                        break;
                    }
                    ++k;
                }
            } catch(e) {};
            break;
            case "textindicator":
            if (!text) {
                try {with (btn.element.style) {
                    backgroundColor = HTMLArea._makeColor(
                        doc.queryCommandValue(HTMLArea.is_ie ? "backcolor" : "hilitecolor"));
                    if (/transparent/i.test(backgroundColor)) {
                        // Mozilla
                        backgroundColor = HTMLArea._makeColor(doc.queryCommandValue("backcolor"));
                    }
                    color = HTMLArea._makeColor(doc.queryCommandValue("forecolor"));
                    fontFamily = doc.queryCommandValue("fontname");
                    fontWeight = doc.queryCommandState("bold") ? "bold" : "normal";
                    fontStyle = doc.queryCommandState("italic") ? "italic" : "normal";
                }} catch (e) {
                    // alert(e + "\n\n" + cmd);
                }
            }
            break;
            case "htmlmode": btn.state("active", text); break;
            case "lefttoright":
            case "righttoleft":
            var el = this.getParentElement();
            while (el && !HTMLArea.isBlockElement(el))
                el = el.parentNode;
            if (el)
                btn.state("active", (el.style.direction == ((cmd == "righttoleft") ? "rtl" : "ltr")));
            break;
            default:
            try {
                btn.state("active", (!text && doc.queryCommandState(cmd)));
            } catch (e) {}
        }
    }
    // take undo snapshots
    if (this._customUndo && !this._timerUndo) {
        this._undoTakeSnapshot();
        var editor = this;
        this._timerUndo = setTimeout(function() {
            editor._timerUndo = null;
        }, this.config.undoTimeout);
    }
    // check if any plugins have registered refresh handlers
    for (var i in this.plugins) {
        var plugin = this.plugins[i].instance;
        if (typeof plugin.onUpdateToolbar == "function")
            plugin.onUpdateToolbar();
    }
};

/** Returns a node after which we can insert other nodes, in the current
 * selection.  The selection is removed.  It splits a text node, if needed.
 */
HTMLArea.prototype.insertNodeAtSelection = function(toBeInserted) {
    if (!HTMLArea.is_ie) {
        var sel = this._getSelection();
        var range = this._createRange(sel);
        // remove the current selection
        sel.removeAllRanges();
        range.deleteContents();
        var node = range.startContainer;
        var pos = range.startOffset;
        switch (node.nodeType) {
            case 3: // Node.TEXT_NODE
            // we have to split it at the caret position.
            if (toBeInserted.nodeType == 3) {
                // do optimized insertion
                node.insertData(pos, toBeInserted.data);
                range = this._createRange();
                range.setEnd(node, pos + toBeInserted.length);
                range.setStart(node, pos + toBeInserted.length);
                sel.addRange(range);
            } else {
                node = node.splitText(pos);
                var selnode = toBeInserted;
                if (toBeInserted.nodeType == 11 /* Node.DOCUMENT_FRAGMENT_NODE */) {
                    selnode = selnode.firstChild;
                }
                node.parentNode.insertBefore(toBeInserted, node);
                this.selectNodeContents(selnode);
                this.updateToolbar();
            }
            break;
            case 1: // Node.ELEMENT_NODE
            var selnode = toBeInserted;
            if (toBeInserted.nodeType == 11 /* Node.DOCUMENT_FRAGMENT_NODE */) {
                selnode = selnode.firstChild;
            }
            node.insertBefore(toBeInserted, node.childNodes[pos]);
            this.selectNodeContents(selnode);
            this.updateToolbar();
            break;
        }
    } else {
        return null;    // this function not yet used for IE <FIXME>
    }
};

// Returns the deepest node that contains both endpoints of the selection.
HTMLArea.prototype.getParentElement = function() {
    var sel = this._getSelection();
    var range = this._createRange(sel);
    if (HTMLArea.is_ie) {
        switch (sel.type) {
            case "Text":
            case "None":
            // It seems that even for selection of type "None",
            // there _is_ a parent element and it's value is not
            // only correct, but very important to us.  MSIE is
            // certainly the buggiest browser in the world and I
            // wonder, God, how can Earth stand it?
            return range.parentElement();
            case "Control":
            return range.item(0);
            default:
            return this._doc.body;
        }
    } else try {
        var p = range.commonAncestorContainer;
        if (!range.collapsed && range.startContainer == range.endContainer &&
            range.startOffset - range.endOffset <= 1 && range.startContainer.hasChildNodes())
            p = range.startContainer.childNodes[range.startOffset];
        /*
        alert(range.startContainer + ":" + range.startOffset + "\n" +
              range.endContainer + ":" + range.endOffset);
        */
        while (p.nodeType == 3) {
            p = p.parentNode;
        }
        return p;
    } catch (e) {
        return null;
    }
};

// Returns an array with all the ancestor nodes of the selection.
HTMLArea.prototype.getAllAncestors = function() {
    var p = this.getParentElement();
    var a = [];
    while (p && (p.nodeType == 1) && (p.tagName.toLowerCase() != 'body')) {
        a.push(p);
        p = p.parentNode;
    }
    a.push(this._doc.body);
    return a;
};

// Selects the contents inside the given node
HTMLArea.prototype.selectNodeContents = function(node, pos) {
    this.focusEditor();
    this.forceRedraw();
    var range;