在组合框值更改时使用新的存储值更新/刷新dojo数据网格 [英] updating/refreshing dojo datagrid with new store value on combobox value changes

问题描述

我的页面上有一个组合框和一个数据网格。当用户更改组合框值时，我必须使用新选择的父级的子级详细信息更新网格。如何使用Dojo组合框和datagrid实现此目的。

I have a combo box and a datagrid in my page. when the user changes the combo box value i have to update the grid with children details of newly selected parent. How can I achieve this using Dojo combo box and datagrid.

以下代码段对我不起作用。当我在带有新json数据的网格上使用setStore方法时。

the following code snippet not working for me. when I use setStore method on the grid with new json data.

<div dojoType="dojo.data.ItemFileReadStore" jsId="store" url="/child/index/"></div> // grid store

<div dojoType="dojo.data.ItemFileReadStore" jsId="parentStore" url="/parent/index/"></div> // combo box store

//组合框

<input dojoType="dijit.form.ComboBox" value="Select" width="auto"  store="parentStore" searchAttr="name" name="parent" id="parent" onchange="displayChildren()"> 

// MY GRID

//MY GRID

<table dojoType="dojox.grid.DataGrid" jsId="grid" store="store" id="display_grid"
    query="{ child_id: '*' }" rowsPerPage="2" clientSort="true"
    singleClickEdit="false" style="width: 90%; height: 400px;"
    rowSelector="20px" selectionMode="multiple">
    <thead>
        <tr>
            <th field="child_id" name="ID" width="auto" editable="false"
                hidden="true">Text</th>
            <th field="parent_id" name="Parent" width="auto"
                editable="false" hidden="true">Text</th>
            <th field="child_name" name="child" width="300px" editable="false">Text</th>
            <th field="created" name="Created Date" width="200px"
                editable="false" cellType='dojox.grid.cells.DateTextBox'
                datePattern='dd-MMM-yyyy'></th>
            <th field="last_updated" name="Updated Date" width="200px"
                editable="false" cellType='dojox.grid.cells.DateTextBox'
                datePattern='dd-MMM-yyyy'></th>
            <th field="child_id" name="Edit/Update" formatter="fmtEdit"></th>
        </tr>
    </thead>
</table>

//父组合框的更改方法，其中我正尝试从中重新加载新数据

//onchange method of parent combo box in which i am trying to reload the grid with new data from the server.

function displayChildren() {
                var selected = dijit.byId("parent").attr("value");
                var grid = dojo.byId('display_grid');
                var Url = "/childsku/index/parent/" + selected;
                grid.setStore(new dojo.data.ItemFileReadStore({ url: Url }));
            }

但是它并没有使用新内容更新网格。我不知道每次用户更改组合框值时如何刷新网格。

But it's not updating my grid with new contents. I don't know how to refresh the grid every time users changes the combo box value.

如果能同时获得ItemFileReadStore和ItemFileWrireStore的解决方案，我将感到很高兴。

推荐答案

我认为您缺少 fetch（）步骤。这是我编写事件处理程序的方式：

I think you're missing the fetch() step. Here is how I would code your event handler:

function displayChildren() {
    var selected = dijit.byId("parent").attr("value");
    var store = new dojo.data.ItemFileWriteStore({ // Read or Write, no difference
        url: "/childsku/index/parent/" + selected
    });
    // Fetch the grid with the data
    store.fetch( {
        query : {},
        onComplete : function(items, request) {
            var grid = dojo.byId('display_grid');
            if (grid.selection !== null) {
                grid.selection.clear();
            }
            grid.setStore(store);
        },
        error: function(message, ioArgs) { alert(message+"\nurl: "+ioArgs.url); }
    });
}

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