The HTML5 Viewer
About customizing the default parameters editors, on creating the viewer object add the parameterEditors
attribute along with the other attributes like serviceUrl, reportSource and etc. The linked article illustrates how to use kendoDropDownList as parameter editor.
Other approach that we can suggest you is to use custom UI to update the viewer's reportSource. Please consider the example in How To: Pass Values to Report Parameters.
I hope this information is helpful.
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