PropertySelection

[John Coleman <jo...@sopranewellandbudge.com>]

Hi,

I've created my own flavour of PropertySelection called 
PropertySelectionWithHint that may display a "choose an option below" in the 
first option of the list.

When there are no elements in the list the components render method just 
returns  . When this happens I'd like the associated TextField label 
component to also not display.

So I added this @If to the template:

<span jwcid="@If" condition="ognl:components.ProductComponentSelect.renderable">
<div class="formLine">
<div class="colLabel">
<span jwcid="topicDetailLabel">Topic Detail</span>
</div>
<div id="productComponentFilter">
<select id="selComponent" jwcid="ProductComponentSelect" tabindex="2" 
onchange="displayProductComponentChangeWaitMessage(); this.form.events.refresh
()"/>
</div>
<div id="productComponentWait" class="hide">
		Please wait...
</div>
</div>

I've added this method to the component:

	public Boolean isRenderable()
	{
		IPropertySelectionModel model = getModel();
		if (model == null)
		{
			throw Tapestry.createRequiredParameterException
(this, "model");
		}
		int count = model.getOptionCount();
		// we only render anything if there are some items to actually 
chose from
		return new Boolean(count > 0);
	}

How do I access the method or a property so that my @If will work please? I 
tried adding abstract methods but can't see how I invoke them when required.

For example putting the property set in the constructor seems no good:

	public PropertySelectionWithHint()
	{
		setRenderable(isRenderable());
	}


TIA
John

								



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