基于字符串检索 Xpages 范围变量

问题描述

我正在修改当前执行的现有代码

I am modifiyng exisiting code which currently does

currentDocument.setValue("field", requestScope.variable);

这很好用，但我现在需要让它更动态一些，所以我将 requestScope.variable 存储为字符串.我知道我可以做到:

This works well, but I now need to make it a little more dynamic so, I have the requestScope.variable stored as a string. I know I can do:

requestScope["variable"]

但这取决于我知道它在哪个范围内.鉴于字符串可能是 requestScope.variable 甚至 applicationScope.variable 我认为这条路线是关闭的我.

but this relies on me knowing which scope it is in. Given that the string could be requestScope.variable or even applicationScope.variable I think this route is closed to me.

我还想过根据 .但认为必须有一个更直接的选择.

I had also thought of splitting the string based on the . but think that there must be a more straightforward option.

我该怎么做?

推荐答案

使用 ${javascript:'requestScope.variable'} 获取定义为字符串的范围变量的值.

Use ${javascript:'requestScope.variable'} to get the value of the scope variable which is defined as a string.

你的例子是

currentDocument.setValue("field", ${javascript:'requestScope.variable'});

${javascript:...} 在这里用作预处理器并将结果插入到代码中.

${javascript:...} works here a preprocessor and inserts the result into the code.

这是一个完整的例子:

<?xml version="1.0" encoding="UTF-8"?>
<xp:view
    xmlns:xp="http://www.ibm.com/xsp/core">

    <xp:this.beforePageLoad><![CDATA[#{javascript:
        sessionScope.test = "this is the value of sessionScope.test";
        viewScope.other = "this is the value of viewScope.other";
        requestScope.myScopeVariable = "viewScope.other";
    }]]></xp:this.beforePageLoad>
    <xp:text
        escape="true"
        id="computedField1"
        value="#{javascript:
            var valueFromSessionScope = ${javascript: 'sessionScope.test'};
            var valueFromViewScope = ${javascript: requestScope.myScopeVariable};
            valueFromSessionScope + ' ... ' + valueFromViewScope;
        }">
    </xp:text>
</xp:view>

结果显示:
这是 sessionScope.test 的值 ... 这是 viewScope.other 的值

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