Now that our extension is initialized, we'll need to prompt the user to choose which sheet on their dashboard to get data from. We will provide the user with a list of buttons and once they select one, show the data for that sheet.
We make use of bootstrap's dialog functionality in this section of the tutorial by creating a new div with the id choose_sheet_dialog. We show and hide this dialog by call $('#choose_sheet_dialog').modal('toggle');
In order to prompt the user, we first need to ask Tableau which worksheets are on the dashboard with our extension by calling tableau.extensions.dashboardContent.dashboard.worksheets to get a list of all the worksheets. For each worksheet, we create a new button and add a click event handler for that button. When the button is clicked, we will take action. This action is described in a later part of the tutorial, but for now we simply display an alert with the name of the selected sheet.
When you drag out your extension, you should now see the dialoig pop up. Once a sheet is selected, an alert displays the sheet's name.
