Question

当我使用dojoConfig设置async: true时，我的DateTextBox无法渲染，但当我使用async: false时一切正常;但我需要async模式才能使用AJAX长时间轮询。如何解决此问题，以便呈现我的控件？

这是我的代码：

<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="dijit/themes/claro/claro.css">
<style>
html, body {
    height: 100%;
    margin: 0;
    overflow: hidden;
    padding: 0;
}
</style>
<script>dojoConfig = {async: true}</script>
<script src='dojo/dojo.js'>
</script>
<script>
require(["dojo/ready", "dijit/form/Button", "dojo/dom", "dijit/registry"], function(ready, Button, dom, registry){
    ready(function(){
        // Create a button programmatically:
            var myButton = new Button({
                label: "button"
            }, "topButton");
    });
});


require(["dojo/ready", "dijit/form/Button", "dojo/dom"], function(ready, Button, dom){
    ready(function(){
        // Create a button programmatically:
        var myButton = new Button({
            label: "button"
        }, "leftButton");
    });
});

require(["dojo/ready", "dijit/form/DateTextBox", "dojo/dom", "dojo/parser"], function(ready, DateTextBox, dom, parser){
    ready(function(){
        // Create a button programmatically:
        var dateTextBox = new DateTextBox({
            value: new Date(2009, 0, 20)
        }, "centerPicker");
    });
});

require(["dojo/ready", "dijit/form/Button", "dojo/dom"], function(ready, Button, dom){
    ready(function(){
        // Create a button programmatically:
        var myButton = new Button({
            label: "button"
        }, "bottomButton");
    });
});

require(["dojo/ready", "dijit/registry", "dijit/layout/BorderContainer", "dijit/layout/ContentPane"],
        function(ready, registry, BorderContainer, ContentPane){
            ready(function(){
                var appLayout = new BorderContainer({
                    design: "headline"
                }, "appLayout");
                 
                appLayout.addChild(
                    new ContentPane({
                        region: "top",
                        content: registry.byId("topButton")
                    })
                );
                appLayout.addChild(
                    new ContentPane({
                        region: "left",
                        content: registry.byId("leftButton")
                    })
                );
                appLayout.addChild(
                    new ContentPane({
                        region: "center",
                        content: registry.byId("centerPicker")
                    })
                );
                appLayout.addChild(
                    new ContentPane({
                        region: "bottom",
                        content: registry.byId("bottomButton")
                    })
                );
                 
                // start up and do layout
                appLayout.startup();
            });
        });
</script>
</head>
<body class="claro">
<style>
html, body {
    height: 100%;
    margin: 0;
    overflow: hidden;
    padding: 0;
}

#appLayout {
    height: 100%;
}
</style>
<div id="appLayout" class="demoLayout"></div>
<button id="topButton" type="button"></button>
<button id="leftButton" type="button"></button>
<div id="centerPicker"></div>
<button id="bottomButton" type="button"></button>
</body>
</html>

Answer 1

如果您构建了一个依赖层，那么这个问题就会消亡。问题是，DateTextBox具有更多的依赖关系，然后是BorderContainer - 因此inputelement的require完成后续下载，然后是布局中的require ..

这反过来使dojo.ready以“错误”的方式排列回调，而不是你所希望的那样。一旦所有依赖项都被下载，.ready就会有一个要调用的函数列表 - 但它是按照脚本排队的方式排序的。

为了克服这个问题，你可以使用'互斥'，因为在某些奇怪的情况下 - 的订单可以在设计需要时排队。你必须使逻辑类似于：

为ContentPane提供region：center an id。
if registry.byId(centerPicker) != undefined: centerRegionContentPane.addChild(registry.byId(centerPicker))。
If registry.byId(centerRegion) != undefined: registry.byId(centerRegion).addChild(centerPickerWidget)在datebox部分下。

当dojoConfig属性async为true时，如何呈现我的DateTextBox控件？

1 个答案: