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如何使字段动态只读，即在 xforms-value-changed 事件和其他事件上？

发布于 2024-12-01 10:56:52 字数 71 浏览 0 评论 0原文

在更改下拉字段中的值时，我想将字段设为只读。据我的编程知识，我们在绑定字段时将字段设置为只读。有什么方法可以根据事件使字段只读？

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谁许谁一生繁华 2024-12-08 10:56:52

我会提出一个不需要显式事件处理程序的解决方案：您可以使用两组控件，一组为只读，另一组可编辑。要在两个集合之间切换，您可以将每个集合放入 xforms:group 中，并使用 ref 属性来控制是否显示该组。

这是一个引用互斥条件的组的示例。根据 selectedvalue 实例节点的值，将显示其中一组。如果 select1 的项集比 1 或 0 更复杂，则必须调整 xforms:group@ref 属性的 XPath。

<xforms:select1 appearance="minimal" ref="instance('main')/path/to/selectedvalue">
...
</xforms:select1>

<xforms:group ref="instance('main')/path/to/selectedvalue eq 1">
    <xforms:input ref="instance('main')/path/to/textinput" />
    <!-- more editable XForms controls, bound to main instance -->
</xforms:group>
<xforms:group ref="instance('main')/path/to/selectedvalue eq 0">
    <xforms:input ref="instance('read-only')/path/to/textinput" />
    <!-- more read-only XForms controls, bound to a read-only instance -->
</xforms:group>

该解决方案的优点是根本不需要事件处理（或者更准确地说，XForms 引擎本身完成事件处理部分；xforms:group 充当服务器上的“事件侦听器”）。实例值本身）。还可以将此技术与显式事件处理结合起来：使用发出 xforms:setvalue ... 的 xforms:action ev:event="xforms-value-changed" > 在由 xforms:group@ref 属性观察的节点上。

I would propose a solution that doesn't require explicit event handlers: you could use two sets of controls with one set read-only, the other set editable. To toggle between both sets, you can put each of the sets in a xforms:group with a ref attribute that controls if the group is displayed or not.

Here's an example with groups referencing mutually exclusive conditions. Depending on the value of the selectedvalue instance node, one of the groups is displayed. If the select1's itemset is more complex than just 1 or 0, you will have to adapt the XPath of the xforms:group@ref attributes.

<xforms:select1 appearance="minimal" ref="instance('main')/path/to/selectedvalue">
...
</xforms:select1>

<xforms:group ref="instance('main')/path/to/selectedvalue eq 1">
    <xforms:input ref="instance('main')/path/to/textinput" />
    <!-- more editable XForms controls, bound to main instance -->
</xforms:group>
<xforms:group ref="instance('main')/path/to/selectedvalue eq 0">
    <xforms:input ref="instance('read-only')/path/to/textinput" />
    <!-- more read-only XForms controls, bound to a read-only instance -->
</xforms:group>

This solution has the advantage that event handling isn't required at all (or, more precisely, the XForms engine does the event handling part itself; the xforms:groups act as "event listeners" on the instance value themselves). It's also possible to combine this technique with explicit event handling: using an xforms:action ev:event="xforms-value-changed" that issues a xforms:setvalue ... on the node that's observed by the xforms:group@ref attributes.

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