从 XML 绑定表达式调用控制器函数 [英] Call controller function from XML binding expression

问题描述

使用 OpenUI5/SAPUI5，根据 ，我们有能力从视图中执行一个函数.

Using OpenUI5/SAPUI5, per documentation on XML Binding Expressions, we have the ability to execute a function from the view.

new sap.m.CheckBox({
    selected: "{= checkSelectedItems(${odata>CustomerId}) }"
})

在视图后面的控制器中:

In my controller behind the view:

checkSelectedItems: function(sCustomerId) {
    return true;
}

在我看来，我收到了通用错误，就好像它找不到我的函数一样:

In my view, I get the generic error as if it cannot find my function:

Uncaught TypeError: Cannot read property 'apply' of undefined

我尝试通过多种方式调用该函数:

I've tried calling the function in several ways:

{= .checkSelectedItems() }
{= my.namespace.checkSelectedItems() }

我什至尝试在我的索引页面的脚本标签中添加一个函数，看看它是否只能访问全局函数，但我也无法触发.建议?我是否误解了文档?

I even tried adding a function in a script tag in my index page to see if it only has access to global functions, but I wasn't able to trigger that either. Suggestions? Am I misinterpreting the documentation?

请在此处查看 JS Bin:http://jsbin.com/sosotacihi/edit?html，输出.我已经注释掉了有问题的 CheckBox，但如果你把它放进去，你会看到错误.

Please see the JS Bin here : http://jsbin.com/sosotacihi/edit?html,output. I've commented out the CheckBox that has the issue, but if you put it in, you'll see the error.

推荐答案

您需要使用 formatter 从 XML 视图调用控制器的方法.

You need to use formatter to call methods of controller from an XML View.

 new sap.m.CheckBox({
     selected: "{parts:['odata>CustomerId'], formatter:'.checkSelectedItems'}"
 });

这可以应用于任何事件触发属性.提到这一点的通用方法是:

This can be applied to any event triggering attribute. The generic way to mentioned this is:

{parts:['<parameter1>', '<parameter2>', ...], formatter:'.<methodInController>'}

这篇关于从 XML 绑定表达式调用控制器函数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！