I've added a nice toggle function to the Checkbox list datatype by using pure javascript/jquery.

I did this using this little jquery plugin and the following bit of jquery:

jQuery(function($) {
 $(".propertyItemContent input[type=checkbox]:first").parents(".propertyItemContent table").after('<a style="cursor:pointer;margin:5px" onclick="$(this.parentNode).toggleCheckboxes()">toggle</a>');
});

I put this code in the same .js file as the plugin. You can find the resulting file here.

Next I needed to add this js file to /umbraco/editContent.aspx. For this I can think of two options:

• create a usercontrol that has nothing more in it then the js reference
• add the js reference directly to /umbraco/editContent.aspx - hardcoded

I did choose the second option because it does not need a usercontrol, but it is not upgrade-proof:

......
<asp:Content ContentPlaceHolderID="head" runat="server">
<script type="text/javascript" src="/umbraco_client/abcmedia/jquery.checkboxes.umb.js"></script>

......

I'm wondering: is there a better, more safe option to add a javascript file to the backend?