E.g. if you call IHeaderResponse#renderJavascript during ajax request
it should be evaluated before component is rendered.
-Matej
On Tue, Jul 22, 2008 at 2:09 PM, Matej Knopp <[EMAIL PROTECTED]> wrote:
> Why can't you just render the javascript in renderHead?
>
> -Matej
>
> On Tue, Jul 22, 2008 at 1:28 PM, Martijn Dashorst
> <[EMAIL PROTECTED]> wrote:
>> the usecase: in onbeforerender we want to add some prepended
>> javascript to the ajaxrequesttarget, sort of like:
>>
>> public class HomePage extends WebPage {
>> private static final long serialVersionUID = 1L;
>> private int teller = 0;
>> public int getTeller() { return teller++; }
>>
>> public HomePage(final PageParameters parameters) {
>> add(new Label("message",
>> new PropertyModel(this, "teller")) {
>>
>> protected void onBeforeRender() {
>> super.onBeforeRender();
>> if (getRequestCycle().getRequestTarget()
>> instanceof AjaxRequestTarget) {
>> ((AjaxRequestTarget)
>> getRequestCycle().getRequestTarget())
>>
>> .prependJavascript("alert('foo');");
>> }
>> }
>> }.setOutputMarkupId(true));
>>
>> add(new AjaxLink("foo") {
>> public void onClick(AjaxRequestTarget target) {
>>
>> target.addComponent(HomePage.this.get("message"));
>> }
>> });
>> }
>> }
>>
>> But this obviously doesn't work, since onbeforerender is called after
>> the prepended javascripts are added to the ajax request target. There
>> are some ways to solve this conundrum:
>>
>> 1. do the before render cycle before prepend javascripts, prepend
>> javascript, render, append javascript
>> 2. render to temporary string, prepend javascript, append javascript,
>> concatenate in correct order
>> 3. adjust wicket-ajax.js / communication protocal to 'type' the
>> various elements, and let wicket-ajax first call prepend, replace
>> component, append javascript.
>>
>> Any other ideas?
>>
>> Martijn
>>
>
