Hi Kyle,
I am afraid that such functionality is not available out of the box. Actually selecting all 700 options at once will be a performance hit for your application which I why I would not recommend it.
As a workaround, I can suggest the following approach:
- use external button/checkbox to trigger a select all action
- instead of selecting all the items, create a collection of their value fields
- set the 'all' array as value of a hidden input (so you can submit all the selected items to the server)
- clear the multiselect value (this will remove any currently selected items)
- change the placeholder and trigger the blur event of the input which will update the placeholder
- disable the widget
Regards,
Alexander Valchev
the Telerik team
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