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From "Malcolm Edgar (JIRA)" <>
Subject [jira] Created: (CLK-640) Add DataProvider for Table and Select controls
Date Sat, 06 Mar 2010 09:43:27 GMT
Add DataProvider for Table and Select controls

                 Key: CLK-640
             Project: Click
          Issue Type: New Feature
          Components: core
    Affects Versions: 2.1.0
            Reporter: Malcolm Edgar
             Fix For: 2.2.0

One reoccurring problem we see with people using Click is the inappropriate use of the Page#onRender()
method. Typically its used to set data into the Table control, but then people will often
use this Page method to set data in other controls such as the FormTable or Select controls,
which breaks their usage contract.

What I would like to see is that data controls such as the Table, Select and FormTable are
able to load the data when they need it, rather than having to rely on the developer injecting
the data at the correct point in the pages life cycle.  This will provide an improve programming
model where developers simply create their controls in the Page constructor or onInit() method,
configure data providers when necessary, and write up control event handlers to the appropriate

The DataProvider interface would be very simple:

public interface DataProvider {
     public List getData();

Developers would then implement this interface when creating their controls:

Table table = new Table();
table.setDataProvider(new DataProvider() {
    public List getData() {
         return customerDao.getCustomerList();

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