getCell(row,col) in GWT HTMLTable

问题:

There is no such method in HTMLTable:

Cell c =  getCell(row,col);

What is the most effective way of getting a cell in an HTML/Flex Table, given the row and column?

回答1:

Depends on what you want to do.

If you want to read/write the content of the cell, you might want to use HTMLTable#setText(int,int) and HTMLTable#getText(int,int), or HTMLTable#setWidget(int,int) and HTMLTable#getWidget(int,int), if the content of the cell is a widget.

There are more functions to read/write properties of the cell in HtmlTable.CellFormatter (link to gwt javadoc) and its subclasses - you can obtain it using HTMLTable#getCellFormatter() and maybe cast it, depending on the implementation of HTMLTable you are using. with the cell formatter you can, for example, set/remove styles, attributes or get the underlying Element (link to gwt javadoc) for even more direct control.

回答2:

HTMLTable has the following methods:

• HTMLTable#isCellPresent(int row, int column)
• HTMLTable#getWidget(int row, int column)

You could write a utility method using both of them like this:

public static Cell<?> getCell(HTMLTable table, int row, int column) {
    if (table != null && table.isCellPresent(row, column)) {
        Widget widget = table.getWidget(row, column);
        if (widget instanceof Cell) {
            return (Cell<?>) widget;
        }
    }
    return null;
}

回答3:

I di the below code to register the mouseover event whcih will fecth the value of any cell you hover and display it in the tooltip. you can modify the listener for a click and get the same stuff.My code for the event is:

Ext.QuickTips.init();   
  grid_plancode.on('mouseover', mouseOver);


function mouseOver(e, tar){
  var t = e.getTarget();
  var overCell = grid_plancode.getView().findCellIndex(t);
  var overRow = grid_plancode.getView().findRowIndex(t); 
var selectedText=grid_plancode.getView().getCell(overRow, overCell);
           if(overCell !== false && overRow !== false) {
Ext.QuickTips.register({target:tar,title:'Value', text:selectedText. innerText }); 
}