Prompting for Files or Folders
It’s generally good practice to avoid hard-coding file and folder paths in a script. Prompting the user to select files and folders makes for a more dynamic script that won’t break when paths change.
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Prompting for a File
Use the Standard Additions scripting addition’s choose file command to prompt the user to select a file. Listing 26-1 and Listing 26-2 demonstrate how to use this command to display the simple file selection dialog with a custom prompt shown in Figure 26-1.

APPLESCRIPT
Listing 26-1AppleScript: Prompting for a fileset theDocument to choose file with prompt 'Please select a document to process:'--> Result: alias 'Macintosh HD:Users:yourUserName:Documents:ImportantDoc.pages'
JAVASCRIPT
Listing 26-2JavaScript: Prompting for a filevar app = Application.currentApplication()app.includeStandardAdditions = truevar document = app.chooseFile({withPrompt: 'Please select a document to process:'})document// Result: Path('/Users/yourUserName/Documents/ImportantDoc.pages')
Prompting for a Specific Type of File
If your script requires specific types of files for processing, you can use the choose file command’s optional of type parameter to provide a list of acceptable types. Types may be specified as extension strings without the leading period (such as 'jpg' or 'png') or as uniform type identifiers (such as 'public.image' or 'com.apple.iwork.pages.sffpages'). Listing 26-3 and Listing 26-4 show how to prompt for an image.
APPLESCRIPT
Listing 26-3AppleScript: Prompting for an imageset theImage to choose file with prompt 'Please select an image to process:' of type {'public.image'}--> Result: alias 'Macintosh HD:Users:yourUserName:Pictures:IMG_0024.jpg'
JAVASCRIPT
Listing 26-4JavaScript: Prompting for an imagevar app = Application.currentApplication()app.includeStandardAdditions = truevar image = app.chooseFile({withPrompt: 'Please select an image to process:',ofType: ['public.image']})image// Result: Path('/Users/yourUserName/Pictures/IMG_0024.jpg')
Prompting for Multiple Files
To let the user choose more than one file, include the choose file command’s optional multiple selections allowed parameter. Listing 26-5 and Listing 26-6 display a prompt asking for multiple images, as shown in Figure 26-2.
APPLESCRIPT
Listing 26-5AppleScript: Prompting for multiple imagesset theImages to choose file with prompt 'Please select some images to process:' of type {'public.image'} with multiple selections allowed--> Result: {alias 'Macintosh HD:Users:yourUserName:Pictures:IMG_0024.jpg', alias 'Macintosh HD:Users:yourUserName:Pictures:IMG_0025.jpg', alias 'Macintosh HD:Users:yourUserName:Pictures:IMG_0026.jpg'}
JAVASCRIPT
Listing 26-6JavaScript: Prompting for multiple images
var app = Application.currentApplication()app.includeStandardAdditions = truevar images = app.chooseFile({withPrompt: 'Please select some images to process:',ofType: ['public.image'],multipleSelectionsAllowed: true})images// Result: [Path('/Users/yourUserName/Pictures/IMG_0024.jpg'), Path('/Users/yourUserName/Pictures/IMG_0025.jpg'), Path('/Users/yourUserName/Pictures/IMG_0026.jpg')]
Prompting for a Folder
Use the Standard Additions scripting addition’s choose folder command to prompt the user to select a folder, such as an output folder or folder of images to process. Listing 26-7 and Listing 26-8 demonstrate how to use this command to display the simple folder selection dialog with a custom prompt shown in Figure 26-3.
APPLESCRIPT
Listing 26-7AppleScript: Prompting for a folder
set theOutputFolder to choose folder with prompt 'Please select an output folder:'--> Result: alias 'Macintosh HD:Users:yourUserName:Desktop:'
JAVASCRIPT
Listing 26-8JavaScript: Prompting for a foldervar app = Application.currentApplication()app.includeStandardAdditions = truevar outputFolder = app.chooseFolder({withPrompt: 'Please select an output folder:'})outputFolder// Result: Path('/Users/yourUserName/Desktop')
Prompting for Multiple Folders
Create Multiple Folders From List
To let the user choose more than one folder, include the choose folder command’s optional multiple selections allowed parameter, as shown in Listing 26-9 and Listing 26-10.
APPLESCRIPT
Extract Files From Multiple Folders Mac Os
Listing 26-9AppleScript: Prompting for multiple foldersset theFoldersToProcess to choose folder with prompt 'Please select the folders containing images to process:' with multiple selections allowed--> Result: {alias 'Macintosh HD:Users:yourUserName:Desktop:', alias 'Macintosh HD:Users:yourUserName:Documents:'}
JAVASCRIPT
Listing 26-10JavaScript: Prompting for multiple foldersvar app = Application.currentApplication()app.includeStandardAdditions = truevar foldersToProcess = app.chooseFolder({withPrompt: 'Please select an output folder:',multipleSelectionsAllowed: true})foldersToProcess// Result: [Path('/Users/yourUserName/Desktop'), Path('/Users/yourUserName/Documents')]
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