combo.js

一个struts和extjs得源码

            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();
        this.value = '';
    },

    /**
     * Sets the specified value into the field.  If the value finds a match, the corresponding record text
     * will be displayed in the field.  If the value does not match the data value of an existing item,
     * and the valueNotFoundText config option is defined, it will be displayed as the default field text.
     * Otherwise the field will be blank (although the value will still be set).
     * @param {String} value The value to match
     */
    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(this.valueNotFoundText !== undefined){
                text = this.valueNotFoundText;
            }
        }
        this.lastSelectionText = text;
        if(this.hiddenField){
            this.hiddenField.value = v;
        }
        Ext.form.ComboBox.superclass.setValue.call(this, text);
        this.value = v;
    },

    // private
    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 pad = this.list.getFrameWidth('tb')+(this.resizable?this.handleHeight:0)+this.assetHeight;
        var h = Math.max(inner.clientHeight, inner.offsetHeight, inner.scrollHeight);
        var ha = this.getPosition()[1]-Ext.getBody().getScroll().top;
        var hb = Ext.lib.Dom.getViewHeight()-ha-this.getSize().height;
        var space = Math.max(ha, hb, this.minHeight || 0)-this.list.shadowOffset-pad-5;
        h = Math.min(h, space, this.maxHeight);

        this.innerList.setHeight(h);
        this.list.beginUpdate();
        this.list.setHeight(h+pad);
        this.list.alignTo(this.wrap, 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();
    },

    /**
     * Select an item in the dropdown list by its data value. This function does NOT cause the select event to fire.
     * The store must be loaded and the list expanded for this function to work, otherwise use setValue.
     * @param {String} value The data value of the item to select
     * @param {Boolean} scrollIntoView False to prevent the dropdown list from autoscrolling to display the
     * selected item if it is not currently in view (defaults to true)
     * @return {Boolean} True if the value matched an item in the list, else false
     */
    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 an item in the dropdown list by its numeric index in the list. This function does NOT cause the select event to fire.
     * The store must be loaded and the list expanded for this function to work, otherwise use setValue.
     * @param {Number} index The zero-based index of the list item to select
     * @param {Boolean} scrollIntoView False to prevent the dropdown list from autoscrolling to display the
     * selected item if it is not currently in view (defaults to true)
     */
    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();
        }
    },

    /**
     * Execute a query to filter the dropdown list.  Fires the {@link #beforequery} event prior to performing the
     * query allowing the query action to be canceled if needed.
     * @param {String} query The SQL query to execute
     * @param {Boolean} forceAll True to force the query to execute even if there are currently fewer characters
     * in the field than the minimum specified by the minChars config option.  It also clears any filter previously
     * saved in the current store (defaults to false)
     */
    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 {@link #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 {@link #expand} event on completion.
     */
    expand : function(){
        if(this.isExpanded() || !this.hasFocus){
            return;
        }
        this.list.alignTo(this.wrap, this.listAlign);
        this.list.show();
        this.innerList.setOverflow('auto'); // necessary for FF 2.0/Mac
        Ext.getDoc().on('mousewheel', this.collapseIf, this);
        Ext.getDoc().on('mousedown', this.collapseIf, this);
        this.fireEvent('expand', this);
    },

    /**
     * @method onTriggerClick
     * @hide
     */
    // 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();
        }
    }

    /**
     * @hide
     * @method autoSize
     */
    /**
     * @cfg {Boolean} grow @hide
     */
    /**
     * @cfg {Number} growMin @hide
     */
    /**
     * @cfg {Number} growMax @hide
     */

});
Ext.reg('combo', Ext.form.ComboBox);