Window.executeJavaScript on page *reload*?

Vaadin 6 / 7 / 8 Framework UI
1

Hi!
I found that
Window
 supports such a very nice feature as
executeJavaScript(‘…’)
. Very cool to init something etc on a document load. Well, it works, as long as an event fired (e.g. user clicks something) or at init first time. But when user reloads a web-browser, of course, init() no more called and things that should be loaded on document load — skipped. So the only way I found so far is to trigger
getWindow()
 which I override and executing JavaScript there.

But the problem is, that
getWindow(…)
 is called exactly as twice per each reload. That is, if I output something to the canvas, it gets there twice. :frowning: I thought I can workaround that with a random ID’s and find dupes. Unlikely, it won’t work, because getWindow(…) will trigger freshly new call to the JavaScript.

Hence, mea culpa, is there a proper way to execute some javascript on document load once?

P.S. Everything is happening as Portlet 2.0 on Liferay. :slight_smile:

2

Aww, interesting problem. Reloading was considered in the design of the method (see
#3589
), but from a bit different perspective as it was assumed that any injected JavaScript is executed only once.

I think you can do it in the old-fashioned way by putting the JavaScript in a element inside a Label in Label.CONTENT_XHTML mode. I’m not totally sure if it works in all browsers though (such as IE6).

3

IMO, not very good idea, since session persists for 30 minutes and user fingers tends to press F5 to reload browser… :slight_smile:

Well, that’s what I was doing so far and that’s what makes me upset, since it makes totally unusable all this idea with executing JavaScript from Window API. :frowning:

IE6 not really a problem, since we have
a very nice patch
 for it, LOL.