javascript-ExtJS 4中带有摘要行的复选框选择网格面板

给定以下网格面板：

Ext.onReady(function() {


    var sm = new Ext.selection.CheckboxModel( {
        listeners:{
            selectionchange: function(selectionModel, selected, options){
                // Bunch of code to update store
            }
        }
    });

    var grid = Ext.create('Ext.grid.Panel', {
        features: [{
            ftype: 'summary'
        }],
        store: store,
        defaults: {               // defaults are applied to items, not the container
            sortable:true
        },
        selModel: sm,
        columns: [
            {header: 'Column 1', flex: 1, dataIndex: 'd1', summaryRenderer: function(value, summaryData, dataIndex) { return "Selected Data"} },
            {header: 'C2', width: 150, dataIndex: 'd2', summaryType: 'sum'},
            {header: 'C3', width: 150, dataIndex: 'd3', renderer: dRenderer, summaryType: 'sum'},
            {header: 'C4', width: 150, dataIndex: 'd4', renderer: dRenderer, summaryType: 'sum'},
            {header: 'C5', width: 150, renderer: total, summaryRenderer: grandTotal}
        ],
        width: "100%",
        title: 'Grid',
        renderTo: 'grid',
        viewConfig: {
            stripeRows: true
        }
    });
});

如何将其重构为仅汇总那些选定行的数据？我知道我可能需要重写摘要功能的sum函数,但无法在文档中找到示例或正确的语法.

谢谢！

这是我尝试的解决方案(发布在Sencha 4.x帮助论坛上,没有回复)：

Ext.define('Ext.grid.feature.SelectedSummary', {
    extend: 'Ext.grid.feature.Summary',
    alias: 'feature.selectsummary',
    generateSummaryData: function(){
        var me = this,
            data = {},
            store = me.view.store,
            selectedRecords = me.view.selModel.selected,
            columns = me.view.headerCt.getColumnsForTpl(),
            i = 0,
            length = columns.length,
            fieldData,
            key,
            comp;

        for (i = 0, length = columns.length; i < length; ++i) {
            comp = Ext.getCmp(columns[i].id);
            val = 0;
            for(j = 0, numRecs = selectedRecords.items.length; j < numRecs; j++ ) {
                field = columns[i].dataIndex;
                rec = selectedRecords.items[j];
                console.log(rec.get(field));
                val += rec.get(field);
            }
            data[comp.dataIndex] = val;//me.getSummary(store, comp.summaryType, comp.dataIndex, false);
        }
        return data;
    }
});

但这只能在初始渲染时正确渲染,并且仅当我使用调试器逐步执行代码时才渲染.在某种竞争条件下,未完成计算就渲染了该行.

有任何想法吗？我的问题太具体了吗？也许只是编写我自己的功能并将其添加到“网格面板”的简单指针.

解决方法:

稍微更新了以前的解决方案：

    var sm = new Ext.selection.CheckboxModel({
        listeners: {
            selectionchange: function (selectionModel, selected, options) {
                // Must refresh the view after every selection
                selectionModel.view.refresh();
            }
        }
    });

    var getSelectedSumFn = function (column, selModel) {
        return function () {
            var records = selModel.getSelection(),
            result = 0;
            Ext.each(records, function (record) {
                result += record.get(column) * 1;
            });
            return result;
        };
    };

然后在网格中使用以下行：

summaryType: getSelectedSumFn(‘d4’, sm)}

标签：extjs,extjs4,javascript
来源： https://codeday.me/bug/20191208/2090454.html