Extjs 下拉框多选

1、效果图:

Extjs 下拉框多选 - china_xuhua - 许华

 2、扩展js类库,在项目中建立一个 js文件,命名为:MultiSelect.js  其代码为:

if ('function' !== typeof RegExp.escape) {
    RegExp.escape = function (s) {
        if ('string' !== typeof s) {
            return s;
        }
        return s.replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
    };
}
Ext.ns('Ext.form');
Ext.form.MultiSelect = Ext.extend(Ext.form.ComboBox, {
    checkField: 'checked',
    multi: true,
    separator: ',',
    initComponent: function () {
        if (!this.tpl) {
            this.tpl = '<tpl for=".">' + '<div class="x-combo-list-item">'
                    + '<img src="' + Ext.BLANK_IMAGE_URL + '" '
                    + 'class="ux-MultiSelect-icon ux-MultiSelect-icon-'
                    + '{[values.' + this.checkField + '?"checked":"unchecked"'
                    + ']}">'
                    + '{[values.' + this.displayField + ']}'
                    + '</div>'
                    + '</tpl>';
        }

        Ext.form.MultiSelect.superclass.initComponent.apply(this, arguments);

        this.on({
            scope: this,
            beforequery: this.onBeforeQuery,
            blur: this.onRealBlur
        });

        this.onLoad = this.onLoad.createSequence(function () {
            if (this.el) {
                var v = this.el.dom.value;
                this.el.dom.value = '';
                this.el.dom.value = v;
            }
        });
    },
    initEvents: function () {
        Ext.form.MultiSelect.superclass.initEvents.apply(this, arguments);
        this.keyNav.tab = false;
    },
    beforeBlur: function () {

    },
    postBlur: function () {

    },

    clearValue: function () {
        this.value = '';
        this.setRawValue(this.value);
        this.store.clearFilter();
        this.store.each(function (r) {
            r.set(this.checkField, false);
        }, this);
        if (this.hiddenField) {
            this.hiddenField.value = '';
        }
        this.applyEmptyText();
    },
    getCheckedDisplay: function () {
        var re = new RegExp(this.separator, "g");
        return this.getCheckedValue(this.displayField).replace(re, this.separator + ' ');
    },
    getCheckedValue: function (field) {
        field = field || this.valueField;
        var c = [];

        var snapshot = this.store.snapshot || this.store.data;
        snapshot.each(function (r) {
            if (r.get(this.checkField)) {
                c.push(r.get(field));
            }
        }, this);

        return c.join(this.separator);
    },
    onBeforeQuery: function (qe) {
        qe.query = qe.query.replace(
              new RegExp(RegExp.escape(this.getCheckedDisplay()) + '[ ' + this.separator + ']*'), '');
    },
    onRealBlur: function () {
        this.list.hide();
        var rv = this.getRawValue();
        var rva = rv.split(new RegExp(RegExp.escape(this.separator) + ' *'));
        var va = [];
        var snapshot = this.store.snapshot || this.store.data;

        Ext.each(rva, function (v) {
            snapshot.each(function (r) {
                if (v === r.get(this.displayField)) {
                    va.push(r.get(this.valueField));
                }
            }, this);
        }, this);
        this.setValue(va.join(this.separator));
        this.store.clearFilter();
    },
    onSelect: function (record, index) {
        if (this.fireEvent('beforeselect', this, record, index) !== false) {

            record.set(this.checkField, !record.get(this.checkField));

            if (this.store.isFiltered()) {
                this.doQuery(this.allQuery);
            }

            if (this.multi) {
                if (record.get("key") == "---" && record.get(this.checkField)) {
                    this.setValue("---");
                }
                else {
                    this.setValue(this.getCheckedValue());
                }
            }
            else {
                this.clearValue();
                this.value = record.get(this.valueField);
                this.setRawValue(record.get(this.displayField));
                this.list.hide();
            }

            this.fireEvent('select', this, record, index);
        }
    },
    setValue: function (v) {
        if (v) {
            v = '' + v;
            if (this.valueField) {
                this.store.clearFilter();
                this.store.each(function (r) {
                    var checked = !(!v.match('(^|' + this.separator + ')'
                                + RegExp.escape(r.get(this.valueField))
                                + '(' + this.separator + '|$)'));
                    r.set(this.checkField, checked);
                }, this);
                this.value = this.getCheckedValue();
                this.setRawValue(this.getCheckedDisplay());
                if (this.hiddenField) {
                    this.hiddenField.value = this.value;
                }
            }
            else {
                this.value = v;
                this.setRawValue(v);
                if (this.hiddenField) {
                    this.hiddenField.value = v;
                }
            }
            if (this.el) {
                this.el.removeClass(this.emptyClass);
            }
        }
        else {
            this.clearValue();
        }
    },
    selectAll: function () {
        this.store.each(function (record) {
            record.set(this.checkField, true);
        }, this);
        this.doQuery(this.allQuery);
        this.setValue(this.getCheckedValue());
    },
    deselectAll: function () {
        this.clearValue();
    }
});
Ext.reg('multiSelect', Ext.form.MultiSelect); 

3、在ext-all.css文件最后,加入css样式

.ux-MultiSelect-icon { width:16px; height:16px; float:left; background-position: -1px -1px ! important; background-repeat:no-repeat ! important; }
.ux-MultiSelect-icon-checked { background: transparent url(../images/default/menu/checked.gif); }
.ux-MultiSelect-icon-unchecked { background: transparent url(../images/default/menu/unchecked.gif); }

4、在aspx页面,引用extjs类库和css样式及刚刚我们扩展的那个js

    <link href="../../ExtJs/ext-2.0.2/resources/css/ext-all.css" rel="stylesheet" type="text/css" />

    <script src="../../ExtJs/ext-2.0.2/adapter/ext/ext-base.js" type="text/javascript"></script>
    <script src="../../ExtJs/ext-2.0.2/ext-all.js" type="text/javascript"></script>
    <script src="../../ExtJs/ext-2.0.2/build/locale/ext-lang-zh_CN.js" type="text/javascript"></script>

    <script src="../../ExtJs/ext-2.0.2/examples/grid/MultiSelect.js" type="text/javascript"></script>

     <script type="text/javascript" language="javascript">
         if ((typeof Range !== "undefined") && !Range.prototype.createContextualFragment) {
             Range.prototype.createContextualFragment = function (html) {
                 var frag = document.createDocumentFragment(),
                        div = document.createElement("div");
                 frag.appendChild(div);
                 div.outerHTML = html;
                 return frag;
             };
         }
     </script>

      (1)、这个是测试

      <script type="text/javascript">
          Ext.onReady(function () {

              var data = [[1, "张三"], [2, "李四"], [3, "王五"], [4, "李龙"], [5, "天哥"], [6, "随影"]];

              var proxy = new Ext.data.MemoryProxy(data);

              var columnName = new Ext.data.Record.create([
             { name: "id", type: "int" },
             { name: "name", type: "string" }
             ]);

              var reader = new Ext.data.ArrayReader({}, columnName);

              var store = new Ext.data.Store({
                  proxy: proxy,
                  reader: reader,
                  autoLoad: true
              });
              store.load();

              //设置默认值
              store.on('load', function () {
                  //taskstatuscombo.selectAll(); //全选
                  taskstatuscombo.setValue("王五"); //默认选中王五
              });

              var taskstatuscombo = new Ext.form.MultiSelect({
                  renderTo: Ext.getBody(),
                  width: 200,
                  editable: false,
                  store: store,
                  valueField: 'name',
                  displayField: "name",
                  mode: 'local',
                  triggerAction: 'all',
                  allowBlank: false,
                  emptyText: '请选择',
                  maxHeight: 200 //下拉框的最大高度
              });
          });
      </script>

    (2)这个是从数据库读出来的数据,显示
        <script type="text/javascript">
        Ext.onReady(function () {
            var taskstatusStore = new Ext.data.JsonStore({
                url: '/DengLu/GetDengLuData/',  //服务方法,这个是mvc的方法
                root: "",
                fields: ['ID', 'D_Name', 'Pass']
            });
            taskstatusStore.load();

            //设置默认值
            taskstatusStore.on('load', function () {
                taskstatuscombo.setValue(3);
            });

            var taskstatuscombo = new Ext.form.MultiSelect({
                renderTo: Ext.getBody(),
                width: 200,
                editable: false,
                store: taskstatusStore,
                valueField: 'ID',
                displayField: "D_Name",
                mode: 'local',
                triggerAction: 'all',
                allowBlank: false,
                emptyText: '请选择',
                maxHeight:200 //下拉框的最大高度
            });
        });
      </script>

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