Why use HTML_QuickForm_advmultiselect ?
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I am sure we have all been there, dealing with HTML_QuickForm because we need to allow users to select multiple options. With a standard html select box, you can select multiple options if the multiple attribute is set, but you have to hold down the appropriate modifier key (ctrl on windows) in order to do so. It is not a problem for end-user experts, but it is not true for all of us.
A quick list of great features
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ability to double click on either select box to move elements from one side to the other.
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add headers to the select boxes.
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ability to change layout easily, using CSS classes and a mini template.
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allows to change item size shown of each multiple select box.
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ability to manage one single list with checkboxes to solve problem if javascript is unavailable.
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