问题
I've racked my brain and done tons of research and testing and can't figure out what is going on.
I have a Dojo datagrid which is declared statically with some HTML. Using the GUI, my users will add items to the DataGrid, which works as it should. However, I'd like to have a function that is called at a certain point that uses Dojo's setQuery to filter the data that shows in the DataGrid. The problem is that once I run the setQuery command, ALL of the data in the grid disappears, no matter if it matches the query or not!
Here is some sample code:
var layoutItems = [[
{
field: "id",
name: "ID",
width: '5px',
hidden: true
},
{
field: "color",
name: "Color",
width: '80px'
}
]];
// Create an empty datastore //
var storeData = {
identifier: 'id',
label: 'id',
items: []
}
var store3 = new dojo.data.ItemFileWriteStore( {data : storeData} );
...
<div id="grid" dojoType="dojox.grid.DataGrid" jsId="grid5" store="store3" structure="layoutItems" queryOptions="{deep:true}" query="{}" rowsPerPage="40"></div>
...
function filterGrid() {
dijit.byId("grid").setQuery({color:"Red"});
}
....
function addItemToGrid(formdata) {
var jsonobj = eval("(" + dojo.toJson(formData, true) + ")");
var myNewItem = {
id: transactionItemID,
color: jsonobj.color
};
// Insert the new item into the store:
store3.newItem(myNewItem);
store3.save({onComplete: savecomplete, onError: saveerror});
}
回答1:
Managed to fix it by running the a grid FILTER instead of setQuery periodically in the background with the help of some jQuery (not sure if setQuery would have worked as well, I don't really know the difference between the filter and setQuery, but filter is doing what I need it to do).
Here is some sample code; hope this helps someone else having problems with this:
// ADD JQUERY
<script src="http://code.jquery.com/jquery-latest.js"></script>
.
// PUT THIS IN THE <HEAD> OF THE PAGE
<script type="text/javascript">
$(document).ready(function() {
function filterTheDataGrid() {
if (dijit.byId("grid") != undefined) {
dijit.byId("grid").filter({color: "Red"});
}
}
// RUN THE filterTheDataGrid FUNCTION EVERY ONE SECOND (1000 MILLISECONDS) //
// LOWER '1000' FOR FASTER REFRESHING, MAYBE TO 500 FOR EVERY 0.5 SECOND REFRESHES //
var refreshDataGrid = setInterval(function() { filterTheDataGrid(); }, 1000);
}
</script>
.
// PUT THIS IN THE <HEAD> OF THE PAGE
<script type="text/javascript">
// SETUP THE LAYOUT FOR THE DATA //
var layoutItems = [[
{
field: "id",
name: "ID",
width: '5px',
hidden: true
},
{
field: "color",
name: "Color",
width: '80px'
}
]];
// Create an empty datastore //
var storeData = {
identifier: 'id',
label: 'id',
items: []
}
var store3 = new dojo.data.ItemFileWriteStore( {data : storeData} );
</script>
.
// PUT THIS IN THE <HTML> OF THE PAGE
<div id="grid" dojoType="dojox.grid.DataGrid" jsId="grid5" store="store3" structure="layoutItems" query="{ type: '*' }" clientSort="true" rowsPerPage="40"></div>
.
<script type="text/javascript">
function addItemToGrid(formdata) {
// THIS FUNCTION IS CALLED BY A DIALOG BOX AND GETS FORM DATA PASSED TO IT //
var jsonobj = eval("(" + dojo.toJson(formData, true) + ")");
var myNewItem = {
id: transactionItemID,
color: jsonobj.color
};
// Insert the new item into the store:
store3.newItem(myNewItem);
store3.save({onComplete: savecomplete, onError: saveerror});
}
</script>
回答2:
Here is another option that I came up with, so that the filter is not running unnecessarily every x milliseconds; this basically uses JavaScript to make a new setInterval which runs once after 500 milliseconds and then does a clearInterval so that it doesn't run again. Looks like just calling the filterTheDataGrids() function after adding an item won't do.. we have to delay for a split second and then call it:
// PUT THIS IN THE <HEAD> OF THE PAGE
<script type="text/javascript">
// Declare the global variables
var refreshDataGrid;
var refreshDataGridInterval = 500; // Change this as necessary to control how long to wait before refreshing the Data Grids after an item is added or removed.
</script>
.
// PUT THIS IN THE <HEAD> OF THE PAGE
<script type="text/javascript">
function filterTheDataGrids() {
if (dijit.byId("grid") != undefined) {
dijit.byId("grid").filter({color: "Red"});
}
clearInterval (refreshDataGrid); // Running the filter just once should be fine; if the filter runs too quickly, then make the global refreshDataGridInterval variable larger
}
</script>
.
// PUT THIS IN THE <HEAD> OF THE PAGE
<script type="text/javascript">
// SETUP THE LAYOUT FOR THE DATA //
var layoutItems = [[
{
field: "id",
name: "ID",
width: '5px',
hidden: true
},
{
field: "color",
name: "Color",
width: '80px'
}
]];
// Create an empty datastore //
var storeData = {
identifier: 'id',
label: 'id',
items: []
}
var store3 = new dojo.data.ItemFileWriteStore( {data : storeData} );
</script>
.
// PUT THIS IN THE <HTML> OF THE PAGE
<div id="grid" dojoType="dojox.grid.DataGrid" jsId="grid5" store="store3" structure="layoutItems" query="{ type: '*' }" clientSort="true" rowsPerPage="40"></div>
.
<script type="text/javascript">
function addItemToGrid(formdata) {
// THIS FUNCTION IS CALLED BY A DIALOG BOX AND GETS FORM DATA PASSED TO IT //
var jsonobj = eval("(" + dojo.toJson(formData, true) + ")");
var myNewItem = {
id: transactionItemID,
color: jsonobj.color
};
// Insert the new item into the store:
store3.newItem(myNewItem);
store3.save({onComplete: savecomplete, onError: saveerror});
// Create setInterval on the filterTheDataGrids function; since simple calling the function won't do; seems to call it too fast or something
refreshDataGrid = setInterval(function() { filterTheDataGrids(); }, refreshDataGridInterval);
}
</script>
来源：https://stackoverflow.com/questions/8172447/dojo-setquery-on-datagrid-all-items-disappear