Simon Palmer’s blog

March 2, 2010

Styling grails-ui elements

Filed under: code, Grails — simonpalmer @ 10:05 pm

The grails-ui plugin has a very rich feature set, being based on the Yahoo’s YUI library.  I have been trying to avoid it, but eventually I have caved and I need a modal dialog box for my web page.  I say caved because I think that it is not an intuitive element of a web application and there are enough cross-browser coding issues to make the introduction of a modal window on a web page a bit of a nightmare.  Of course that’s all taken care of by libraries such as YUI, but they come at a price; there’s a lot of code to download.

Anyhow, I caved and decided I would install the ui plugin to my project and use the dialog box.  It still feels like a bit of a sledgehammer to crack my little nut, but it works and it is not as buggy as the modal DIV I started writing myself.

The trouble is that out of the box you get none of the default styling from the YUI skins.  According to the grails documentation it should be sufficient to enclose your dialog in a tag and set the class of that tag to refer to the YUI skins…

        <div class="yui-skin-sam">
            <gui:dialog blah blah></gui:dialog>

However, this doesn’t work. And neither does this…

    <body class="yui-skin-sam">
            <gui:dialog blah blah></gui:dialog>

In fact the only way I could get this to work was by adding the “yui-skin-sam” class reference to the body tag in layout/main.gsp.

But that comes with a set of problems of its own, not least of which is that styling the body tag in the main layout means that every generated page gets that styling. If, like me, you had gone to some lengths to define your own styling, that is a real pain because the chance of you not having weird clashes in styles – and yui-skin-sam not overriding them – is almost nil for any semi-serious web app.

So, some words to the wise:

  • If you are starting out on your new shiny Grails app, and you want to style it yourself, imply a namespace in your style names when you are making them by prefixing them all with a code.
  • If you think you might want some exoteric UI feature from the grails UI plug-in – and you almost certainly will – then install it early and declare the style class on the main layout body tag from the start. That way you won’t have a lot of re-factoring of style code to do later.

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