ext 下拉多选组件

Question

本人刚接触ext，要做table布局下放置下拉多选组件，在网上找了些资料，也没有弄明白，麻烦ext高手给指点指点，谢谢！

Answer 1

Ext.form.MultiComboBox = Ext.extend(Ext.form.TriggerField, {
    defaultAutoCreate: { tag: "input", type: "text", size: "24", autocomplete: "off" },
    listClass: '',
    selectedClass: 'x-combo-selected',
    triggerClass: 'x-form-arrow-trigger',
    shadow: 'sides',
    listAlign: 'tl-bl?',
    maxHeight: 300,
    triggerAction: 'query',
    minChars: 4,
    typeAhead: false,
    queryDelay: 500,
    pageSize: 0,
    selectOnFocus: false,
    queryParam: 'query',
    loadingText: 'Loading...',
    resizable: false,
    handleHeight: 8,
    editable: true,
    allQuery: '',
    mode: 'remote',
    minListWidth: 70,
    forceSelection: false,
    typeAheadDelay: 250,
    displaySeparator: ';',
    valueSeparator: ',',
    lazyInit: true,
    initComponent: function() {
        Ext.form.ComboBox.superclass.initComponent.call(this);
        this.addEvents(
            'expand',
            'collapse',
            'beforeselect',
            'select',
            'beforequery'
        );
        if (this.transform) {
            this.allowDomMove = false;
            var s = Ext.getDom(this.transform);
            if (!this.hiddenName) {
                this.hiddenName = s.name;
            }
            if (!this.store) {
                this.mode = 'local';
                var d = [], opts = s.options;
                for (var i = 0, len = opts.length; i < len; i++) {
                    var o = opts[i];
                    var value = (Ext.isIE ? o.getAttributeNode('value').specified : o.hasAttribute('value')) ? o.value : o.text;
                    if (o.selected) {
                        this.value = value;
                    }
                    d.push([value, o.text]);
                }
                this.store = new Ext.data.SimpleStore({
                    'id': 0,
                    fields: ['value', 'text'],
                    data: d
                });
                this.valueField = 'value';
                this.displayField = 'text';
            }
            s.name = Ext.id(); // wipe out the name in case somewhere else they have a reference
            if (!this.lazyRender) {
                this.target = true;
                this.el = Ext.DomHelper.insertBefore(s, this.autoCreate || this.defaultAutoCreate);
                Ext.removeNode(s); // remove it
                this.render(this.el.parentNode);
            } else {
                Ext.removeNode(s); // remove it
            }        }
        this.selectedIndex = -1;
        if (this.mode == 'local') {
            if (this.initialConfig.queryDelay === undefined) {
                this.queryDelay = 10;
            }
            if (this.initialConfig.minChars === undefined) {
                this.minChars = 0;
            }
        }
    },    // private
    onRender: function(ct, position) {
        Ext.form.ComboBox.superclass.onRender.call(this, ct, position);
        var disValue = "";
        if (this.hiddenName) {
            this.hiddenField = this.el.insertSibling({ tag: 'input', type: 'hidden', name: this.hiddenName, id: (this.hiddenId || this.hiddenName) },
                    'before', true);
            var hvalue = this.hiddenValue !== undefined ? this.hiddenValue :
                this.value !== undefined ? this.value : '';
            var hvalueArray = hvalue.split(this.valueSeparator);            for (var i = 0; i < this.store.data.length; i++) {
                var r = this.store.getAt(i);
                var newValue = r.data[this.displayField];
                var v = r.data[this.valueField];
                for (var j = 0; j < hvalueArray.length; j++) {
                    if (hvalueArray[j] == v) {
                        disValue += newValue + this.displaySeparator;
                    }
                }            }
            this.hiddenField.value = this.hiddenValue !== undefined ? this.hiddenValue :
                this.value !== undefined ? this.value : '';
            this.el.dom.removeAttribute('name');
        }
        if (Ext.isGecko) {
            this.el.dom.setAttribute('autocomplete', 'off');
        }        if (!this.lazyInit) {
            this.initList();
        } else {
            this.on('focus', this.initList, this, { single: true });
        }        if (!this.editable) {
            this.editable = true;
            this.setEditable(false);
        }
        this.setValue(disValue);
    },    initList: function() {
        if (!this.list) {
            var cls = 'x-combo-list';            this.list = new Ext.Layer({
                shadow: this.shadow, cls: [cls, this.listClass].join(' '), constrain: false
            });            var lw = this.listWidth || Math.max(this.wrap.getWidth(), this.minListWidth);
            this.list.setWidth(lw);
            this.list.swallowEvent('mousewheel');
            this.assetHeight = 0;            if (this.title) {
                this.header = this.list.createChild({ cls: cls + '-hd', html: this.title });
                this.assetHeight += this.header.getHeight();
            }            this.innerList = this.list.createChild({ cls: cls + '-inner' });
            this.innerList.on('mouseover', this.onViewOver, this);
            this.innerList.on('mousemove', this.onViewMove, this);
            this.innerList.setWidth(lw - this.list.getFrameWidth('lr'))            if (this.pageSize) {
                this.footer = this.list.createChild({ cls: cls + '-ft' });
                this.pageTb = new Ext.PagingToolbar({
                    store: this.store,
                    pageSize: this.pageSize,
                    renderTo: this.footer
                });
                this.assetHeight += this.footer.getHeight();
            }            if (!this.tpl) {
                //alert(cls);
                //x-combo-list-item
                this.tpl = '<tpl for="."><div class="' + cls + '-item"><span class="unchecked" name="checkBox_{' + this.valueField + '}"+ width="20">&nbsp;&nbsp;&nbsp;&nbsp;</span>{' + this.displayField + '}</div></tpl>';
            }
            this.view = new Ext.DataView({
                applyTo: this.innerList,
                tpl: this.tpl,
                singleSelect: true,
                selectedClass: this.selectedClass,
                itemSelector: this.itemSelector || '.' + cls + '-item'
            });            this.view.on('click', this.onViewClick, this);            this.bindStore(this.store, true);            if (this.resizable) {
                this.resizer = new Ext.Resizable(this.list, {
                    pinned: true, handles: 'se'
                });
                this.resizer.on('resize', function(r, w, h) {
                    this.maxHeight = h - this.handleHeight - this.list.getFrameWidth('tb') - this.assetHeight;
                    this.listWidth = w;
                    this.innerList.setWidth(w - this.list.getFrameWidth('lr'));
                    this.restrictHeight();
                }, this);
                this[this.pageSize ? 'footer' : 'innerList'].setStyle('margin-bottom', this.handleHeight + 'px');
            }
        }
    },    bindStore: function(store, initial) {
        if (this.store && !initial) {
            this.store.un('beforeload', this.onBeforeLoad, this);
            this.store.un('load', this.onLoad, this);
            this.store.un('loadexception', this.collapse, this);
            if (!store) {
                this.store = null;
                if (this.view) {
                    this.view.setStore(null);
                }
            }
        }
        if (store) {
            this.store = Ext.StoreMgr.lookup(store);            this.store.on('beforeload', this.onBeforeLoad, this);
            this.store.on('load', this.onLoad, this);
            this.store.on('loadexception', this.collapse, this);            if (this.view) {
                this.view.setStore(store);
            }
        }
    },    // private
    initEvents: function() {
        Ext.form.ComboBox.superclass.initEvents.call(this);        this.keyNav = new Ext.KeyNav(this.el, {
            "up": function(e) {
                this.inKeyMode = true;
                this.selectPrev();
            },            "down": function(e) {
                if (!this.isExpanded()) {
                    this.onTriggerClick();
                } else {
                    this.inKeyMode = true;
                    this.selectNext();
                }
            },            "enter": function(e) {
                this.onViewClick();
                //return true;
            },            "esc": function(e) {
                this.collapse();
            },            "tab": function(e) {
                this.onViewClick(false);
                return true;
            },            scope: this,            doRelay: function(foo, bar, hname) {
                if (hname == 'down' || this.scope.isExpanded()) {
                    return Ext.KeyNav.prototype.doRelay.apply(this, arguments);
                }
                return true;
            },            forceKeyDown: true
        });
        this.queryDelay = Math.max(this.queryDelay || 10,
                this.mode == 'local' ? 10 : 250);
        this.dqTask = new Ext.util.DelayedTask(this.initQuery, this);
        if (this.typeAhead) {
            this.taTask = new Ext.util.DelayedTask(this.onTypeAhead, this);
        }
        if (this.editable !== false) {
            this.el.on("keyup", this.onKeyUp, this);
        }
        if (this.forceSelection) {
            this.on('blur', this.doForce, this);
        }
    },

Answer 2

onDestroy: function() {
        if (this.view) {
            this.view.el.removeAllListeners();
            this.view.el.remove();
            this.view.purgeListeners();
        }
        if (this.list) {
            this.list.destroy();
        }
        this.bindStore(null);
        Ext.form.ComboBox.superclass.onDestroy.call(this);
    },    // private
    fireKey: function(e) {
        if (e.isNavKeyPress() && !this.list.isVisible()) {
            this.fireEvent("specialkey", this, e);
        }
    },    // private
    onResize: function(w, h) {
        Ext.form.ComboBox.superclass.onResize.apply(this, arguments);
        if (this.list && this.listWidth === undefined) {
            var lw = Math.max(w, this.minListWidth);
            this.list.setWidth(lw);
            this.innerList.setWidth(lw - this.list.getFrameWidth('lr'));
        }
    },    // private
    onDisable: function() {
        Ext.form.ComboBox.superclass.onDisable.apply(this, arguments);
        if (this.hiddenField) {
            this.hiddenField.disabled = this.disabled;
        }
    },
    setEditable: function(value) {
        if (value == this.editable) {
            return;
        }
        this.editable = value;
        if (!value) {
            this.el.dom.setAttribute('readOnly', true);
            this.el.on('mousedown', this.onTriggerClick, this);
            this.el.addClass('x-combo-noedit');
        } else {
            this.el.dom.setAttribute('readOnly', false);
            this.el.un('mousedown', this.onTriggerClick, this);
            this.el.removeClass('x-combo-noedit');
        }
    },    // private
    onBeforeLoad: function() {
        if (!this.hasFocus) {
            return;
        }
        this.innerList.update(this.loadingText ?
               '<div class="loading-indicator">' + this.loadingText + '</div>' : '');
        this.restrictHeight();
        this.selectedIndex = -1;
    },    // private
    onLoad: function() {
        if (!this.hasFocus) {
            return;
        }
        if (this.store.getCount() > 0) {
            this.expand();
            this.restrictHeight();
            if (this.lastQuery == this.allQuery) {
                if (this.editable) {
                    this.el.dom.select();
                }
                if (!this.selectByValue(this.value, true)) {
                    this.select(0, true);
                }
            } else {
                this.selectNext();
                if (this.typeAhead && this.lastKey != Ext.EventObject.BACKSPACE && this.lastKey != Ext.EventObject.DELETE) {
                    this.taTask.delay(this.typeAheadDelay);
                }
            }
        } else {
            this.onEmptyResults();
        }
    },    // private
    onTypeAhead: function() {
        if (this.store.getCount() > 0) {
            var r = this.store.getAt(0);
            var newValue = r.data[this.displayField];
            var len = newValue.length;
            var selStart = this.getRawValue().length;
            if (selStart != len) {
                this.setRawValue(newValue);
                this.selectText(selStart, newValue.length);
            }
        }
    },
    // private
    onSelect: function(record, index) {
        if (this.fireEvent('beforeselect', this, record, index) !== false) {
            var r = this.store.getAt(index);
            var newValue = r.data[this.valueField];
            var check = document.getElementsByName("checkBox_" + newValue)[0];
            if (check.className == "checked") {
                check.className = "unchecked"
            } else {
                check.className = "checked"
            }
            var value = "";
            var hiddenValue = "";
            for (var i = 0; i < this.store.data.length; i++) {
                var r = this.store.getAt(i);
                newValue = r.data[this.valueField];
                check = document.getElementsByName("checkBox_" + newValue)[0];
                if (check.className == "checked") {
                    value += r.data[this.displayField] + this.displaySeparator;
                    hiddenValue += r.data[this.valueField] + this.valueSeparator;
                }
            }
            if (value.length > 1) {
                value = value.substring(0, value.length - this.displaySeparator.length);
            }
            if (hiddenValue.length > 1) {
                hiddenValue = hiddenValue.substring(0, hiddenValue.length - this.valueSeparator.length);
            }
            this.setValue(value);
            this.hiddenField.value = hiddenValue;
            this.hiddenValue = hiddenValue;
            this.fireEvent('select', this, record, index);
        }
    },
    getValue: function() {
        if (this.valueField) {
            return typeof this.value != 'undefined' ? this.value : '';
        } else {
            return Ext.form.ComboBox.superclass.getValue.call(this);
        }
    },    /**
    * Clears any text/value currently set in the field
    */
    clearValue: function() {
        if (this.hiddenField) {
            this.hiddenField.value = '';
        }
        this.setRawValue('');
        this.lastSelectionText = '';
        this.applyEmptyText();
    },
    setValue: function(v) {
        var text = v;
        if (this.valueField) {
            var r = this.findRecord(this.valueField, v);
            if (r) {
                text = r.data[this.displayField];
            } else if (Ext.isDefined(this.valueNotFoundText)) {
                text = this.valueNotFoundText;
            }
        }
        Ext.form.ComboBox.superclass.setValue.call(this, text);
        var _arrStr = this.getValues();
        if (_arrStr.length != 0) {
            this.value = _arrStr.toString();   /*写成this.value = v是给后台的数据是中文，现在给的数据是Id*/
            this.hiddenValue = _arrStr.toString();
            this.lastSelectionText = _arrStr.toString();
            if (this.hiddenField) {
                this.hiddenField.value = _arrStr.toString();
            }
        } else {
            this.value = v;
            this.lastSelectionText = v;
            this.hiddenValue = v;
            if (this.hiddenField) {
                this.hiddenField.value = v;
            }
        }    },

Answer 3

findRecord: function(prop, value) {
        var record;
        if (this.store.getCount() > 0) {
            this.store.each(function(r) {
                if (r.data[prop] == value) {
                    record = r;
                    return false;
                }
            });
        }
        return record;
    },    // private
    onViewMove: function(e, t) {
        this.inKeyMode = false;
    },    // private
    onViewOver: function(e, t) {
        if (this.inKeyMode) { // prevent key nav and mouse over conflicts
            return;
        }
        var item = this.view.findItemFromChild(t);
        if (item) {
            var index = this.view.indexOf(item);
            this.select(index, false);
        }
    },    // private
    onViewClick: function(doFocus) {
        var index = this.view.getSelectedIndexes()[0];
        var r = this.store.getAt(index);
        if (r) {
            this.onSelect(r, index);
        }
        if (doFocus !== false) {
            this.el.focus();
        }
    },    // private
    restrictHeight: function() {
        this.innerList.dom.style.height = '';
        var inner = this.innerList.dom;
        var fw = this.list.getFrameWidth('tb');
        var h = Math.max(inner.clientHeight, inner.offsetHeight, inner.scrollHeight);
        this.innerList.setHeight(h < this.maxHeight ? 'auto' : this.maxHeight);
        this.list.beginUpdate();
        this.list.setHeight(this.innerList.getHeight() + fw + (this.resizable ? this.handleHeight : 0) + this.assetHeight);
        this.list.alignTo(this.el, this.listAlign);
        this.list.endUpdate();
    },    // private
    onEmptyResults: function() {
        this.collapse();
    },    /**
    * Returns true if the dropdown list is expanded, else false.
    */
    isExpanded: function() {
        return this.list && this.list.isVisible();
    },
    selectByValue: function(v, scrollIntoView) {
        if (v !== undefined && v !== null) {
            var r = this.findRecord(this.valueField || this.displayField, v);
            if (r) {
                this.select(this.store.indexOf(r), scrollIntoView);
                return true;
            }
        }
        return false;
    },
    select: function(index, scrollIntoView) {        this.selectedIndex = index;
        this.view.select(index);
        if (scrollIntoView !== false) {
            var el = this.view.getNode(index);
            if (el) {
                this.innerList.scrollChildIntoView(el, false);
            }
        }
    },    // private
    selectNext: function() {
        var ct = this.store.getCount();
        if (ct > 0) {
            if (this.selectedIndex == -1) {
                this.select(0);
            } else if (this.selectedIndex < ct - 1) {
                this.select(this.selectedIndex + 1);
            }
        }
    },    // private
    selectPrev: function() {
        var ct = this.store.getCount();
        if (ct > 0) {
            if (this.selectedIndex == -1) {
                this.select(0);
            } else if (this.selectedIndex != 0) {
                this.select(this.selectedIndex - 1);
            }
        }
    },    // private
    onKeyUp: function(e) {
        if (this.editable !== false && !e.isSpecialKey()) {
            this.lastKey = e.getKey();
            this.dqTask.delay(this.queryDelay);
        }
    },    // private
    validateBlur: function() {
        return !this.list || !this.list.isVisible();
    },    // private
    initQuery: function() {
        this.doQuery(this.getRawValue());
    },    // private
    doForce: function() {
        if (this.el.dom.value.length > 0) {
            this.el.dom.value =
                this.lastSelectionText === undefined ? '' : this.lastSelectionText;
            this.applyEmptyText();
        }
    },
    doQuery: function(q, forceAll) {
        if (q === undefined || q === null) {
            q = '';
        }
        var qe = {
            query: q,
            forceAll: forceAll,
            combo: this,
            cancel: false
        };
        if (this.fireEvent('beforequery', qe) === false || qe.cancel) {
            return false;
        }
        q = qe.query;
        forceAll = qe.forceAll;
        if (forceAll === true || (q.length >= this.minChars)) {
            if (this.lastQuery !== q) {
                this.lastQuery = q;
                if (this.mode == 'local') {
                    this.selectedIndex = -1;
                    if (forceAll) {
                        this.store.clearFilter();
                    } else {
                        this.store.filter(this.displayField, q);
                    }
                    this.onLoad();
                } else {
                    this.store.baseParams[this.queryParam] = q;
                    this.store.load({
                        params: this.getParams(q)
                    });
                    this.expand();
                }
            } else {
                this.selectedIndex = -1;
                this.onLoad();
            }
        }
    },    // private
    getParams: function(q) {
        var p = {};
        //p[this.queryParam] = q;
        if (this.pageSize) {
            p.start = 0;
            p.limit = this.pageSize;
        }
        return p;
    },
    /**
    * Hides the dropdown list if it is currently expanded. Fires the 'collapse' event on completion.
    */
    collapse: function() {
        if (!this.isExpanded()) {
            return;
        }
        this.list.hide();
        Ext.getDoc().un('mousewheel', this.collapseIf, this);
        Ext.getDoc().un('mousedown', this.collapseIf, this);
        this.fireEvent('collapse', this);
    },
    // private
    collapseIf: function(e) {
        if (!e.within(this.wrap) && !e.within(this.list)) {
            this.collapse();
        }
    },    /**
    * Expands the dropdown list if it is currently hidden. Fires the 'expand' event on completion.
    */
    expand: function() {
        if (this.isExpanded() || !this.hasFocus) {
            return;
        }
        this.list.alignTo(this.wrap, this.listAlign);
        var _arrStr = this.getValues(), hvalueArray = [], __arrStr = [];
        if (_arrStr.length === 0) {
            hvalueArray = this.hiddenField.value.split(this.valueSeparator);
        } else {
            hvalueArray = this.getValues().split(this.valueSeparator);
        }
        this.list.show();
        for (var i = 0; i < hvalueArray.length; i++) {
            for (var j = 0; j < this.store.data.length; j++) {
                var r = this.store.getAt(j);
                var newValue = r.data[this.valueField];
                var v = r.data[this.valueField];
                if (hvalueArray[i] == v) {
                    __arrStr.push("checkBox_" + newValue);
                }
            }
        }
        (function() {
            if (__arrStr.length > 0) {
                for (var k = 0; k < __arrStr.length; k++) {
                    document.getElementsByName(__arrStr[k])[0].className = "checked";
                }
            }
        }).defer(800);
        Ext.getDoc().on('mousewheel', this.collapseIf, this);
        Ext.getDoc().on('mousedown', this.collapseIf, this);
        this.fireEvent('expand', this);
    },
    // private
    // Implements the default empty TriggerField.onTriggerClick function
    onTriggerClick: function() {
        if (this.disabled) {
            return;
        }
        if (this.isExpanded()) {
            this.collapse();
            this.el.focus();
        } else {
            this.onFocus({});
            if (this.triggerAction == 'all') {
                this.doQuery(this.allQuery, true);
            } else {
                this.doQuery(this.getRawValue());
            }
            this.el.focus();
        }
    }
});
Ext.reg('multicombo', Ext.form.MultiComboBox);