jEasyUI 列运算

在本教程中,您将学习如何在可编辑的数据网格(datagrid)中包含一个运算的列。一个运算列通常包含一些从一个或多个其他列运算的值。

首先,创建一个可编辑的数据网格(datagrid)。这里我们创建了一些可编辑列,'listprice'、'amount' 和 'unitcost' 列定义为 numberbox 编辑类型。运算列是 'unitcost' 字段,将是 listprice 乘以 amount 列的结果。

    <table id="tt" style="width:600px;height:auto"
            title="Editable DataGrid with Calculated Column" iconCls="icon-edit" singleSelect="true"
            idField="itemid" url="data/datagrid_data.json">
        <thead>
            <tr>
                <th field="itemid" width="80">Item ID</th>
                <th field="listprice" width="80" align="right" editor="{type:'numberbox',options:{precision:1}}">List Price</th>
                <th field="amount" width="80" align="right" editor="{type:'numberbox',options:{precision:0}}">Amount</th>
                <th field="unitcost" width="80" align="right" editor="numberbox">Unit Cost</th>
                <th field="attr1" width="150" editor="text">Attribute</th>
                <th field="status" width="60" align="center" editor="{type:'checkbox',options:{on:'P',off:''}}">Status</th>
            </tr>
        </thead>
    </table>

当用户点击一行的时候,我们开始一个编辑动作。

    var lastIndex;
    $('#tt').datagrid({
        onClickRow:function(rowIndex){
            if (lastIndex != rowIndex){
                $('#tt').datagrid('endEdit', lastIndex);
                $('#tt').datagrid('beginEdit', rowIndex);
                setEditing(rowIndex);
            }
            lastIndex = rowIndex;
        }
    });

为了在一些列之间创建运算关系,我们应该得到当前的 editors,并绑定一些事件到它们上面。

    function setEditing(rowIndex){
        var editors = $('#tt').datagrid('getEditors', rowIndex);
        var priceEditor = editors[0];
        var amountEditor = editors[1];
        var costEditor = editors[2];
        priceEditor.target.bind('change', function(){
            calculate();
        });
        amountEditor.target.bind('change', function(){
            calculate();
        });
        function calculate(){
            var cost = priceEditor.target.val() * amountEditor.target.val();
            $(costEditor.target).numberbox('setValue',cost);
        }
    }