ExtJS4 LinkButton Component

问题

I'm trying to create my own LinkButton component in Ext JS 4. Nothing new, right?

My code looks like this:

Ext.define('LinkButton', {
    extend: 'Ext.Component',
    xtype: 'linkbutton',
    autoEl: 'a',
    renderTpl: '<a href=\"javascript:;\">{text}</a>',
    config: {
        text: '',
        handler: function () { }
    },
    initComponent: function () {
        var me = this;
        me.callParent(arguments);

        this.renderData = {
            text: this.getText()
        };

        var handler = me.getHandler();
        if (handler) {
            me.on('click', handler);
        }
    }
});

So far so good! My LinkButton does look like a hyperlink anad my text content is in there. Graceful.

However, I can't get my component to fire an event when I click on it!

This particular line me.on('click', handler); is not working! Even if I change it from on to addListener it has no effect.

So question is: How do I add DOM events to my component? Or, even better, how do I access my own component's DOM element? I haven't been able to do any of that!

Thanks!

回答1:

Here is my proposition, which is basing on source from Button component:

Ext.define('LinkButton', {
    extend: 'Ext.Component',
    xtype: 'linkbutton',
    autoEl: 'a',
    renderTpl: '<a href=\"javascript:;\" id="{id}-btnEl">{text}</a>',
    config: {
        text: '',
        handler: function () { }
    },
    initComponent: function () {
        var me = this;
        me.callParent(arguments);

        this.renderData = {
            text: this.getText()
        };
    },
    onRender: function(ct, position) {
        var me = this, 
            btn;

        me.addChildEls('btnEl');

        me.callParent(arguments);

        btn = me.btnEl;

        me.mon(btn, 'click', me.onClick, me);
    },
    onClick: function(e) {
        var me = this;
        if (me.preventDefault || (me.disabled && me.getHref()) && e) {
            e.preventDefault();
        }
        if (e.button !== 0) {
            return;
        }
        if (!me.disabled) {
            me.fireHandler(e);
        }
    },
    fireHandler: function(e){
        var me = this,
            handler = me.handler;

        me.fireEvent('click', me, e);
        if (handler) {
            handler.call(me.scope || me, me, e);
        }
    }
});

Working sample: http://jsfiddle.net/lolo/AEwH4/1/

回答2:

Or you can do this

afterRender : function() {
    this.callParent(arguments);

    this.mon(this.el, {
        scope : this,
        delegate : 'a',
        click : this.handleClick
    });
},

handleClick : function(e, t) {
    e.stopEvent();

    var handler = this.getHandler();
    if (handler) {
        handler();
    }
}

回答3:

the right way is to use Ext.view.View for such tasks. There is custom html that allow you to do anything, and in same time all the functionality of Ext.Component is available.

来源：https://stackoverflow.com/questions/9592356/extjs4-linkbutton-component

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extjs4