ext给grid加toolTip提示（转自http://blog.sina.com.cn/s/blog_5a5d07e60100n7l3.html）
定义某表头如下：
{header : "姓名",dataIndex : "person_name",sortable : true,renderer :function (data, metadata, record, rowIndex, columnIndex, store) {
//build the qtip:
var title = '明细：';
var tip = record.get('person_name');
metadata.attr = 'ext:qtitle="' + title + '"' + ' ext:qtip="' + tip + '"';
//return the display text:
return data;
}},
cmGridZQ.on('render',function(grid){
var sto=grid.getStore();
var view=grid.getView();
cmGridZQ.tip = new Ext.ToolTip({
target: view.mainBody, // The overall target element.
delegate: '.x-grid3-row', // Each grid row causes its own seperate show and hide.
trackMouse: true,
renderTo:cmGridZQ.body,
listeners: {
beforeshow: function updateTipBody(tip) {
var rowIndex = view.findRowIndex(tip.triggerElement);
if(sto.getAt(rowIndex).get('sign')){
tip.body.dom.innerHTML = "<font color='green'>已打印："+sto.getAt(rowIndex).get('sign')+"</font>";
}else{
tip.body.dom.innerHTML = "<font color='red'>暂未打印任何单据</font>";
}
}
}
});
})