关于Ext 修复源代码 bug的方法

Ext修复源代码出现的问题

1.使用override属性,重写组件

定义一个新的组件,override属性设为要重写的源组件

例子:
Extjs4.2.3遇到的一个bug,Datefield 选择不了年月，会自动关闭
sencha论坛具体的讨论

重写组件的代码以下,该组件的方法会覆盖掉原来的方法,

再将该组件放进overrides文件夹(不一样版本可能有所不同)
或者
将该组件放进项目代码下,而且在viewport初始化时引入

/**
 * This override fixes an ExtJS 4.2.3 defect where the picker closes early.
 *
 * @markdown
 * @docauthor Rex Staples
 */
Ext.define('app.view.FormFieldDate', {
    override: 'Ext.form.field.Date',

    // Overrides code below come from ExtJS 4.2.2
    // http://docs.sencha.com/extjs/4.2.2/source/Picker.html#Ext-form-field-Picker

    /**
     * @private
     * Runs on mousewheel and mousedown of doc to check to see if we should collapse the picker
     */
    collapseIf: function(e) {
        var me = this;

        if (!me.isDestroyed && !e.within(me.bodyEl, false, true) && !e.within(me.picker.el, false, true) && !me.isEventWithinPickerLoadMask(e)) {
            me.collapse();
        }
    },

    mimicBlur: function(e) {
        var me = this,
            picker = me.picker;
        // ignore mousedown events within the picker element
        if (!picker || !e.within(picker.el, false, true) && !me.isEventWithinPickerLoadMask(e)) {
            me.callParent(arguments);
        }
    },

    /**
     * returns true if the picker has a load mask and the passed event is within the load mask
     * @private
     * @param {Ext.EventObject} e
     * @return {Boolean}
     */
    isEventWithinPickerLoadMask: function(e) {
        var loadMask = this.picker.loadMask;
        return loadMask ? e.within(loadMask.maskEl, false, true) || e.within(loadMask.el, false, true) : false;
    }
});

2.使用Ext.override()方法重写组件

在初始化时调用Ext.override()方法并重写须要的方法

Ext.override(Ext.menu.DatePicker, {
    owns: function(element) {
        if (this.picker && this.picker.monthPicker && this.picker.monthPicker.owns(element)) {
            return true;
        }
        return this.callParent(arguments);
    }
});