THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Date: 27 January 2006<p>2006
Author: David Leangen http://www.leangen.net
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Rather, what we need is a repeater that refreshes itself each time the page renders. This is exactly what ListView is for!
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When working with a database, it is often a good choice to However, for the sake of simplicity, in this example we use |
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Note: this code has not been tested. It is only intended to show the concepts.
SearchPage extends WebPage
{
String criteria;
List results;
//getters and setters
public SearchPage()
{
ListView view =
new ListView ( "list", new PropertyModel(this, "results"))
{
protected void populateItem( ListItem item )
{
String result = (String) item.getModelObject();
item.add( new Label( "item", result ) );
}
}
);
Form form = new SearchForm(....);
form.add( new TextField( "idtextField", new PropertyModel(this, "criteria" ) );
form.add
(
new Button("button")
{
onsubmitpublic void onSubmit()
{
results = getResultsFromCriteria(criteria);
}
}
);
add(form);
}
}
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The principle is this: every time the page renders, the ListView will populate itself with the inserted List, that also happens to be a page property. Every time the form is submitted (i.e. there is a new request for a search), the List is updated based on the results obtained using the search string.
In other words, all the objects are created once and only once in the Page constructor, but the data is retrieved dynamically upon each Page render.
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For additional discussion on ListView see: |
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