var array = ["Impression", "Clicks", "CTR", "CVR", "CPC", "CPM", "CPA"]
data : array,
If you want have some option to be selected from array, your html should contain that option.
For example- if you want to set "Impression" to be selected, change your html to following-
<select> <option selected="selected">Impression</option> </select>
And if you want to provide your options with some
value, you should change your Array to be an array of objects. For more details, please check this link.