TypeError:无法读取属性'<类名的一部分>'未定义 [英] TypeError: Cannot read property '<part of class name>' of undefined
问题描述
我试图在SAPUI5中添加 InfoLabel
new sap.tnt.InfoLabel({/*...*/); 但是此错误在重复:
TypeError:无法读取未定义的属性'InfoLabel'
-
请确保在
清单中的.例如，对于/sap.ui5/dependencies/libs中声明目标模块所属的所有依赖库.jsonsap.tnt.InfoLabel:<代码>"sap.ui5":{依赖关系":{"libs":{"sap.ui.core":{}，"sap.m":{} ，"sap.tnt":{} }}，注意:
manifest.json也称为要查看您的应用运行的UI5版本，请按 Ctrl + Shift + 左Alt + P .
I have tried to add the
InfoLabelin SAPUI5new sap.tnt.InfoLabel({/*...*/);But this error is repeating:
TypeError: Cannot read property 'InfoLabel' of undefined
解决方案Make sure to declare all dependent libraries, to which the target modules belong, in
/sap.ui5/dependencies/libswithinmanifest.json. Forsap.tnt.InfoLabelfor example:"sap.ui5": { "dependencies": { "libs": { "sap.ui.core": {}, "sap.m": {}, "sap.tnt": {} } },Note:
manifest.jsonis also called Descriptor for Applications, Components, and Libraries or simply app descriptor.If there is no
manifest.json, add the dependent libraries todata-sap-ui-libsinindex.html:<script id="sap-ui-bootstrap" src="..." data-sap-ui-libs="sap.ui.core,sap.m,sap.tnt">Modules should be accessed only after their dependent libs are preloaded. This can be ensured using various APIs depending on the use case:
Declaratively using
sap/ui/core/ComponentSupport.js(Recommended):<script id="sap-ui-bootstrap" src="..." data-sap-ui-async="true" data-sap-ui-resourceroots='{"my.demo": "./"}' data-sap-ui-oninit="module:sap/ui/core/ComponentSupport" ... ></script> <body class="sapUiBody" id="content"> <div style="height: 100%;" data-sap-ui-component data-id="rootComponentContainer" data-name="my.demo" data-height="100%" data-settings='{ "id": "rootComponent" }' ></div> </body>Doc: Declarative API for Initial Components, Sample: https://embed.plnkr.co/16J1TFICxbqETCzaxuZ0
Using an inline-script (Only if there is no
manifest.json; only for small demos):<script id="sap-ui-bootstrap" src="..." data-sap-ui-libs="sap.ui.core, sap.m, sap.tnt" data-sap-ui-async="true" ... ></script> <script> sap.ui.getCore().attachInit(function() { // your code... }); </script> <body class="sapUiBody" id="content"></body>
Additionally, avoid referencing controls via global names (e.g.
sap.tnt.…)! Instead, require the modules accordingly:sap.ui.define([ // Dependency list; requiring the modules: "sap/ui/core/mvc/Controller", "sap/tnt/InfoLabel", ], function(Controller, InfoLabel) { "use strict"; return Controller.extend("myController", { someMethod: function(/*...*/) { const myInfoLabel = new InfoLabel({/*...*/}); // without a global name // ... }, }); });From the doc:
[...] your application modules have to facilitate the concept for defining and handling of modules in UI5 that is aligned with the asynchronous module definition (AMD) standard.
[...] All necessary module dependencies [...] need to be handled by
sap.ui.requireorsap.ui.define.See also the topic Modules and Dependencies.
It's also important to always check if the target module is available in the UI5 version at all. For example, the
sap.tnt.InfoLabelwas introduced in 1.54. You might get a 404-error if you're trying to require a module that doesn't exist yet.In order to see which UI5 version your app is running with, press Ctrl+Shift+Left Alt+P.
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