???? 在Ext JS 3.x 中，如果为GridPanel中的每个Cell都显示tooltip时，而内容是就Cell内容时，有一种比较好的方法就是官网推荐的【Ext JS 3.x\src\widgets\tips\ToopTip.js】中的第90行到108行的例子,如下所示

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var myGrid = new Ext.grid.GridPanel(gridConfig);
myGrid.on('render', function(grid) {
    var store = grid.getStore();  // Capture the Store.
    var view = grid.getView();    // Capture the GridView.
    myGrid.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,         // Moving within the row should not hide the tip.
        renderTo: document.body,  // Render immediately so that tip.body can be
                                  //  referenced prior to the first show.
        listeners: {              // Change content dynamically depending on which element
                                  //  triggered the show.
            beforeshow: function updateTipBody(tip) {
                var rowIndex = view.findRowIndex(tip.triggerElement);
                tip.body.dom.innerHTML = 'Over Record ID ' + store.getAt(rowIndex).id;
            }
        }
    });
});

然而这个例子，只限于显示row，而不适合cell，当我们仿照取列数时

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var cellIndex = view.findCellIndex(tip.triggerElement); 

这时总会返回一个false，于是就到不得Cell对象或内容。经过一段时间的摸索，终于找到的原因，原来上面指定delegate属性为row, 我们只需要改成

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 delegate: '.x-grid3-cell',

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?这样我就到得Cell对象，显示tooltip就小事一桩，给个例子供大家参考

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				listeners : {
					scope : this,
					render: function (grid){
						    //var store = grid.getStore();  // Capture the Store.
						    var view = grid.getView();    // Capture the GridView.
						    grid.tip = new Ext.ToolTip({
						        target: view.mainBody,    // The overall target element.
						        delegate: '.x-grid3-cell', // Each grid row causes its own seperate show and hide.
						        trackMouse: true,         // Moving within the row should not hide the tip.
						        renderTo: document.body,  // Render immediately so that tip.body can be
						        anchor: 'top',
						        listeners: {              // Change content dynamically depending on which element
						                                  //  triggered the show.
						            beforeshow: function updateTipBody(tip) {
						                var rowIndex = view.findRowIndex(tip.triggerElement);
						                var cellIndex = view.findCellIndex(tip.triggerElement);
						                //前三列或大于第八列内容不提示
						                if(cellIndex < 3 || cellIndex >8)return false;
						                var cell = view.getCell(rowIndex, cellIndex);
						                tip.body.dom.innerHTML = cell.innerHTML;
						            }
						        }
						    });
					}
				}

?这时监听只要放在grid中就可以达到效果。

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如果你的Cell中不是原始的数据，包括编辑框、颜色、图片等，显示时就不是理想的效果，自己可根据实际情况自行过滤。