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Functions in Photoshop

Author: FotoFects More by this author

Added: Nov 23, 2005 Rating:

Level: Professional Software: Photoshop

Creating a Function

If you are new to scripting for Photoshop, please view our Photoshop Scripting Basics tutorial for an introduction to Photoshop scripting and a few exercises about basic JavaScript.

Functions are a great way to keep large and complicated lines of code organized.

1. Type in the function keyword. `function`

2. Enter the name for your Function followed by parentheses ( ). This name will be used everytime you want to tell your scirpt to run the function. `function myFunction()`

3. Create an opening brace and closing brace {}. The brace will hold the code that will be run when you call myFunction(). `function myFunction() { }`

4. Type in the code between the braces {};. `function myFunction() { alert("This is a function"); }`

5. Now everytime we want to use the alert, you can simply type in myFunction() instead. Run the script in Photoshop (File> Script> Browse) to ensure that it is working. `function myFunction() { alert("This is a function"); }` `myFunction();`

Adding Parameters to a Function

You may also pass paramaters to functions making them more useful.

1. First type in the function code: `function sum() { }`

2. Type in the variables you would like to set inside the brackets. Seperate the variables by a comma. `function sum(myVar, myVar2, myVar3) { }`

3. Lets type an alert function to test the variables. `function sum(myVar, myVar2, myVar3) { alert(a + b + c) ; }`

4. Call the function with the values of the variables inside the parenthesis ( ). `function sum(myVar, myVar2, myVar3) { alert(myVar + myVar2 + myVar3) ; }` `sum(4, 6, 8)`

5. Save and run the script inside Photoshop (File> Scripts> Browse). A pop-up should appear with the sum of 4 + 6 + 8.