Extjs grid column里添加button等html标签，并增加点击事件

Extjs里有个actioncolumn,但actioncolumn只能添加一系列button，不能既有字又有button

如何能在column里增加html标签，并给button添加事件呢？

1. 首先，在column里重写renderer方法，方法里拼html语句

View里主要代码如下：

columns: [{
header: 'Complex column',
width: 90,
renderer: function(value, cellmeta, record) {
var display="Text";
display+='</br>';
display+='<input type="image" class="add" src="extjs/resources/themes/images/spinner.gif" alt="Add" />';
display+='<input type="image" class="edit" src="extjs/resources/themes/images/spinner.gif" alt="Edit">';
display+='<input type="image" class="delete" src="extjs/resources/themes/images/spinner.gif" alt="Delete">';
return display;
}
}]

2. 在Controller里添加事件

init : function() {
console.log('The window was rendered');
this.control({
'ResultPage > grid[id=resultGrid]':{
cellclick:this.cellClick
}
});
},

cellClick : function(grid, td, cellIndex, record, tr, rowIndex, e, eOpts) {
console.log("cell clicked");
var add = e.getTarget('.add');
var edit = e.getTarget('.edit');
var del = e.getTarget('.delete');
if (add) {
console.log("click add");
}
if(edit){
console.log("click edit");
}
if(del){
console.log("click del");
}
}

这里有一点要注意，html里用class标识，然后在事件里用getTarget('.add')去寻找。我尝试在html里用id，getTarget(id)找不到。