On Tue, 05 Dec 2006 17:40:57 -0000 "MR" <[EMAIL PROTECTED]> wrote:
> > Hi everyone, > > I spent an awful lot of time last night learning that if I instantiate > a widget and call it's render method that the javascript files > referenced with "javascript = JSLink(...)" are apparently not made > available in the serialized output (or any other way I could find) to > be loaded into the document's head (or anywhere else for that > matter)...But obviously the javascript is automatically loaded into > the head for you when you call a widget's display() method from the > kid template. > > What I was trying to do was use render() to get a widget's HTML so > that I could shove it into a div at some point after a page had been > loaded. The HTML arrived just fine, but the JavaScript did not. This > was totally counter-intutive to me, so could someone please comment > on why render() doesn't include the JavaScript in a <script> tag as > part of the serialized output? I really am just trying to find a way > to get a widget's JavaScript so that it can be loaded into a page > *without* using display(). > > Is there an approved way to get at the actual javascript with an > existing mechanism, or is my assumption that it's a "good idea" to try > and do this for purposes of loading JavaScript into the head after > page load actually a bad idea? > > > An example (not tested, but serves the example) > > def FooWidget(Widget): > > template = "..." > javascript = [JSLink(...)] > > > def someMethodInController(): > foo = FooWidget() > html = foo.render() > #how to get javascript out of FooWidget with instantiation of > FooWidget? > #I want to create a script element and shove it into a page after > page load I thought I wrote about this in a blog post, but I didn't get to exactly the issue... It's not the .display() that adds javascript to the headers of a page, it's returning the widget in your controller. The expose decorator sees that you passed a widget to the template and adds the JSLink to the header. If you don't call .display() for a widget or even reference it in the template, but still return it in the dict, the JSLink references will show up. Remember that when you call .render() all the widget does is spit out a string that is the template rendered. Turbogears has no idea where that text came from, that it was a widget, or that that widget had JSLink javascript with it... Even if Turbogears did know all of that, you'd still have the problem you already heard about with loading script tags after the page is loaded. Now you know, Jason
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