ExtJS Grid 每个Cell都显示tooltip

 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

 

 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

 

 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

 

 delegate: '.x-grid3-cell',

 

 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

 

 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。

 

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。