Hello ldc0618,
In order to get the attribute you should reference the element in which HTML the attribute is rendered and extract it by using the getAttribute method. In this case, this element is the element of the slider which is rendered by the server and which can be referenced by using the get_element method. Please examine the following code snippet I prepared for you:
Please, use the above as a start point for your implementation and let me know how it goes.
All the best,
Svetlina
the Telerik team
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