Boolean works for disabled but not for if / unless

answered 2009-05-27 17:59:32 +0800

robertpic71
1275 ● 1

if and unless are renderoptions and not part of the UI-Model. The only checked 1x (while rendering the page the first time). Databinding starts after render the page.

- You can use $EL's - when there is no need for dynamic change.
- You can use @databinding and visible (maybe use an converter to reverse the boolean)

/Robert

answered 2009-06-06 05:07:55 +0800

davout
1435 ● 3 ● 18

I have the same problem with a grid where I'm using databinding. The basic problem is that the 'if' attribute has been designed for use at a grid not row level. In reality I suspect most developers want control at both levels.

A typical use case is where the component set into a grid row cell will vary according to the model row/cell data value, i.e. if its one value use a Toolbarbutton or another use a Label. Like...

grid id="grid_first">
   <columns>
     <column label="ID" />
     <column label="Enable" />
   </columns>
   <rows>
      <row self="@{each=line}" value="@{line}">
         <label id="id" value="@{line.id}" />
         <!-- show label if product line already exists, otherwise show link -->
         <label id="product_enable" value="Yes" if="@{line.enabled}"/>
         <toolbarbutton id="addLine" title="Add product line" if="@{line.enabled == false}"/>
         <image src="/img/mypic.gif" unless="@{line.enabled}"/>
      </row>
   </rows>
</grid>

answered 2011-10-17 04:30:56 +0800

Newion
78 ● 1 ● 1

>> You can use @databinding and visible

This will not work if you have two components sharing one model.
Example:
<hbox>
<textbox value="@{action.value}" visible="@{controller.textboxVisible}"/>
<combobox selectedItem="@{action.value}" model="@{controller.values}" visible="@{controller.textboxNotVisible}"/>
</hbox>

In this case shared model is 'action.value'. One of the components must specify binding attribute 'access='load', otherwise you will get conflicting updates of the model.