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Getting user confirmation
Getting user confirmation has been edited by Loren Rosen (Jan 10, 2007). Change summary: use AttributeModifier instead of AbstractBehavior It's common to want the user to confirm his action if it would be hard to reverse, e.g. if he asked to delete something. Here's one way to do this, using _javascript_: Link removeLink = new Link("removeLink") { @Override public void onClick() { // do something you want to confirm beforehand } }; removeLink.add( new SimpleAttributeModifier("onclick", "return confirm('are you sure?');")); SimpleAttributeModifier will replace any existing onclick handler in the html. We can instead add our _javascript_ to any existing _javascript_ by creating our own AttributeModifier instead of using SimpleAttributeModifier: public class _javascript_EventConfirmation extends AttributeModifier { public _javascript_EventConfirmation(String event, String msg) { super(event, true, new Model(msg)); } protected String newValue(final String currentValue, final String replacementValue) { String result = "return confirm('" + replacementValue + "')"; if (currentValue != null) { result = currentValue + "; " + result; } return result; } } Then we attach the modifier to the link: removeLink.add(new _javascript_EventConfirmation("onclick", "are you sure?")); If you are using the same confirmation in more than one link, you should subclass Link to encapsulate the change: abstract public class ConfirmLink extends Link { public ConfirmLink(String id, String msg) { super(id); add(new _javascript_EventConfirmation("onclick", "are you sure?")); } @Override abstract public void onClick(); } (The subclass could of course use SimpleAttributeModifier instead.) |
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