OnDemandGrid(Dgrid)不会在向下滚动时触发请求(对于新数据)

时间:2012-07-26 18:44:42

标签: javascript dojo dgrid

好吧,我已经能够使它与DataGrid一起工作,但由于某种原因,Dgrid可能真的令人印象深刻,同时,真的很令人沮丧(许多人推荐它)。到目前为止,我已经能够请求一定数量的数据(只有第一次调用,所以我的请求标头指定返回25项...),一旦我尝试向下滚动以获得更多项目(因此应该发送额外的请求没有任何反应。

基本上这是用jsonrest构建的商店:

define([
    "dojo/store/Memory",
    "dojo/store/JsonRest",
    "dojo/store/Cache",
    "dojo/store/Observable"
    ],
function(
    Memory,
    JsonRest,
    Cache,
    Observable
){

    var contentMemoryStore = new Memory();
    var contentJsonRestStore = new JsonRest({target: "http://dev.mpact.tv:30087/rest/contenus/"});

    contentStore = new Cache(contentJsonRestStore, contentMemoryStore);

    return new Observable(contentStore);
});

然后,我将此商店传递给OnDemandGrid的属性。

我检查了这个人的例子:http://www.speich.net/articles/demos/jsonrest/dojo-demo-dgrid.php 我检查了dgrid(OnDemandList)的文档:https://github.com/SitePen/dgrid/wiki/Core-Components

添加了请求标头/响应标头(但我认为它们是正确的): enter image description here enter image description here

服务器端代码(在perl中):

$r->headers_out->set('Content-Range', sprintf("items %d-%d/%d", $start, $start 
+ $num_items - 1, $total));

更新

我使用旧的jsonstore(dojox / data)进行了快速测试:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <title>Statut des canaux générés par Gipsy</title>
        <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"></meta>
        <style type="text/css">
            @import "/dojo/dojo/resources/dojo.css";
            @import "/dojo/dijit/themes/tundra/tundra.css";
            @import "/dojo/dojox/grid/resources/Grid.css";
            @import "/dojo/dojox/grid/resources/tundraGrid.css";
            //.grid {
            //    width: 70em;
            //    height: 40em;
            //}
            .Title { text-align: center }
            html, body { height: 100%; margin: 0px; font-size: 14px; }
        </style>
        <script type="text/javascript" src="/dojo/dojo/dojo.js"  djConfig="isDebug:false, parseOnLoad: false"></script>
        <script type="text/javascript">
            dojo.require("dijit.layout.BorderContainer");
            dojo.require("dijit.layout.ContentPane");
            dojo.require("dojox.grid.TreeGrid");
            dojo.require("dijit.tree.ForestStoreModel");
            dojo.require("dojox.data.JsonRestStore");
            dojo.require("dojo.parser");

            dojo.addOnLoad(function(){

                dojo.parser.parse();

                var layout = [
                    { name: "Dossier", field: "repertoire", width: "auto" },
                    { name: "Fichier", field: "fichier", width: "auto" },
                    { name: "Nom", field: "nom", width: "auto" },
                    { name: "Date", field: "date", width: "auto" }
                ];
                //var jsonStore = new dojo.data.ItemFileReadStore({ data: dataItems });
                //var jsonStore = new dojo.data.ItemFileReadStore({ url: "/cgi-bin/senscity/stingray.json", clearOnClose: true });
                var jsonStore = new dojox.data.JsonRestStore({idAttribute: 'id', target: 'http://dev.mpact.tv:30087/rest/contenus'});
                var treeModel = new dijit.tree.ForestStoreModel({
                    store: jsonStore,
                    query: { type: 'canal' },
                    rootId: 'canalRoot',
                    rootLabel: 'Banane',
                    childrenAttrs: ['children']
                });
                var grid = new dojox.grid.TreeGrid({
                    treeModel: treeModel,
                    structure: layout,
                    selectable: true,
                    defaultOpen: false
                }, 'programmatic_grid');
                grid.startup();
                dojo.connect(window, "onresize", grid, "resize");
            });
        </script>
    </head>
    <body class="tundra">
<!-- -->
        <h1 class="Title" style="margin-bottom: 0.5em;">Statut de la programmation</h1>
        <div dojoType="dijit.layout.BorderContainer" style="width: 100%; height: 100%;">
<!--
            <div dojoType="dijit.layout.ContentPane" region="top" style="height: 20pt; padding: 0px; border: 0px;">
            date de dernière mise à jour, décompte de prochaine mise à jour, bouton de mise à jour, case de désactivation de mise à jour automatique
            </div>
-->
            <div dojoType="dijit.layout.ContentPane" region="center">
<!-- -->
                <div id="programmatic_grid"></div>
<!-- -->
            </div>
<!-- -->
        </div>
    </body>
</html>

所以,我猜它必须是商店或网格。

2 个答案:

答案 0 :(得分:5)

请注意,有一个HTTP标头Range。这表示正在请求的项目。然后在响应中,您需要包含一个Content-Range标题,该标题描述了返回的项目和可用的总数。

您的回复包含标题:

Content-Range: items=0-24/123456

看起来格式需要:

Content-Range: items 0-24/66

来自JsonRest Documentation

Paging

JsonRest store uses HTTP’s Range header to perform paging. When a request is made for a range of items, JsonRest will include a Range header with an items range unit specifying the range:

Range: items=0-24
On your server, you should look at the Range header in the request to know which items to return. The server should respond with a Content-Range header to indicate how many items are being returned and how many total items exist:

Content-Range: items 0-24/66

答案 1 :(得分:3)

我忘了提到我正在用我的休息框架做跨域请求(也许应该说它......)。

2天后发现,这是我问题的原因(我仍然不知道原因或来源)。当我将代码迁移到服务器时,一切正常。在我的php服务器上做了一个简单的小测试来填充onDemandeGrid并看到它在我的localhost上运行了!

另外,为了绕过跨域,我在服务器端的其余代码上添加了这个标头(继续在跨域开发,直到我们有一个不错的开发环境):

Access-Control-Expose-Headers:Content-Range