Scripting

Here you will find javascript snippets that performs one certain small task for learning and application

Recommended Readings

Repositories

• Kbar Scriplet Github

• Redefinery Scripting Fundamentals

• http://www.motionscript.com/ae-scripting/pre-comp-to-layer-dur.html

Functions

//String
indexOf() // gets index of character
split("delimiter") // Split a string into an array of substrings:
length //Return the number of characters in a string
match // Search a string for "ain":
slice() // remove characters from front

// Arrays 
splice() // add elementsto array
toString() // convert to string 

//REGEX
\t // tab
\n // line
\r // carriage return
\s // whitespace


Ref: https://www.w3schools.com/jsref/jsref_replace.asp

Useful Extendscript references

Item	Code
Alert	alert("This is an alert")
Select	openDialog("Please select files")
Open file	var spreadsheet = File("/Users/ddu/Desktop/spreadsheet.csv");
Open (Prompt)	var spreadsheet = File.openDialog("Please select .csv file");
Read	var readOK = spreadsheet.open("r");
Prompt (with default value)	var value = prompt("What is the value", 10," This is the title");

Basics

// Selection
var proj = app.project;
var myComp = app.project.activeItem; // or use "comp"
var myLayers = myComp.selectedLayers;


// Setting values 
~.property("Position").setValue([120,120]);

// making guide layers
.guideLayer = true;

// adding expressions
var exp = "string of expression";
~.transform.position.expression =exp;

How to use Menu Commands

// Using ID number
var inMenuID = 2000;
app.executeCommand(inMenuID);


// Using name
app.executeCommand(app.findMenuCommandId("New Project"));

Adding

//solid
app.project.item(index).layers.addSolid(color, name, width, height, pixelAspect[, duration])

//null
myNull = app.project.activeItem.layers.addNull(); 

Solid Layer

black

// Black Solid at Comp size

myComp = app.project.activeItem;
mySolid = myComp.layers.addSolid([0,0,0], "Solid", myComp.width, myComp.height,1);

comp color

ramp

check error

Adjustment Layer

// Add Adjustment Layer with Effect.jsx
try{
    var adjLayer = app.project.activeItem.layers.addSolid([0,0,0], "Adjustment Layer", app.project.activeItem.width, app.project.activeItem.height, app.project.activeItem.pixelAspect, app.project.activeItem.duration);
    adjLayer.adjustmentLayer = true;
    adjLayer.effect.addProperty("Curves"); 
    }
catch (e) {
    alert (e);
    }

Text layer

app.project.activeItem.layers.addText('sourceText')
myText.property("Source Text").expression = " thisComp.name + \" (\" + (1 + (time/thisComp.frameDuration)) + \")\"  "; //add expression
myText.property("Position").setValue([172, 644]); //set position to lower right corner

//using an array
var content = ['text','text','text'] // read content
for(var i=0; i < content.length; i++){
    app.project.activeItem.layers.addText(content[i]);
}

More details:http://docs.aenhancers.com/layers/textlayer/#textlayer

Shape layer

myComp = app.project.activeItem;
myColor = [0,128,255]; // How to set hex code though? Attached to a global fill?

// Create shape layer
var myShapeLayer = myComp.layers.addShape();
myShapeLayer.name = ("minRect");

// Create shape layer & shape (Ellipse, Rect,)
var shapeGroup = myShapeLayer.property("Contents").addProperty("ADBE Vector Group");
var myRect = shapeGroup.property("Contents").addProperty("ADBE Vector Shape - Rect"); //
myRect.property("Size").setValue([300,100]);

// Create stroke properties
var myStroke = shapeGroup.property("Contents").addProperty("ADBE Vector Graphic - Stroke");
myStroke.property("Color").setValue(myColor);
myStroke.property("Opacity").setValue([100]);
myStroke.property("Stroke Width").setValue([2]);


// Create fill
var myFill = shapeGroup.property("Contents").addProperty("ADBE Vector Graphic - Fill");
myFill.property("Color").setValue(myColor);
myFill.property("Opacity").setValue([100]);
var myRepeater = shapeGroup.property("Contents").addProperty("ADBE Vector Filter - Repeater");

// Source: https://forums.creativecow.net/docs/forums/post.php?forumid=227&postid=28156&univpostid=28156&pview=t

Creating a hyperlink

// Source: https://stackoverflow.com/questions/17665920/open-web-page-in-after-effects-with-extendscript

// checking that the script can access the network:

if (app.preferences.getPrefAsLong("Main Pref Section", "Pref_SCRIPTING_FILE_NETWORK_SECURITY") != 1) {
    alert("Please tick the \"Allow Scripts to Write Files and Access Network\" checkbox if Preferences > General");

    // Then open Preferences > General to let people tick the checkbox
    app.executeCommand(2359);

    // Here you should check again if they ticked it, and choose to continue or stop ...
}
// checking of the OS:

var os = system.osName;
if (!os.length) {
    // I never remember which one is available, but I think $.os always is, you'll have to check
    os = $.os;
}
app_os = (os.indexOf("Win") != -1) ? "Win" : "Mac"

//os-dependent system calls:

var url = "http://aescripts.com";

if (app_os == "Win") {
    system.callSystem("explorer " + url);
} else {
    system.callSystem("open " + url);
}

Folder creation

basics

//create a single folder
 app.project.items.addFolder("foldername);
 
 // create a folder set
var topFolder = app.project.items.addFolder("Top Level");
topFolder.parentFolder = app.project.rootFolder;
var subFolder = app.project.items.addFolder("Sub Level");
subFolder.parentFolder = topFolder;


// number of items in project panel
app.project.items.length

parentFolders

createChildFolder

Instance of

for (var i=0; i<proj.selection.length; i++)
{
    if (proj.selection[i] instanceof CompItem)
        comps[comps.length] = proj.selection[i];
}

Check if

Check if Layer Has Specific Effect Applied To It

var myLayer = app.project.activeItem.layer(1);
var hasEffect = false;

for (var i = 1; i <= myLayer.property("Effects").numProperties; i++) {
    if (myLayer.property("Effects").property(i).matchName == "ADBE Tile") {
        alert("It does!");
        hasEffect = true;
        break;
    }
}

if (!hasEffect) {
    myLayer.property("Effects").addProperty("ADBE Tile");
}

Limitations

indexOf()

IndexOf is a string function and doesn't work with arrays anywhere.


//Source: https://forums.creativecow.net/docs/forums/post.php?forumid=227&postid=37977&univpostid=37977&pview=t

Removing

Effects property group [1]

comp

// removes ALL effects from ALL the layers in active composition

var myComp = app.project.activeItem;
var myEffects;

function removeCompFx(){
  for (var i = 1; i <= myComp.numLayers; i++){
    try{
      myEffects = myComp.layer(i).Effects;
      for (j = myEffects.numProperties; j > 0; j--){
        myEffects.property(j).remove();
      }
    }catch(err){
    }
  }
}

app.beginUndoGroup("removeFx");
removeCompFx();

selected layers

Expressions

Randomize [1]

Position

//Distributes layers in 2D space within comp size
var thisComp = app.project.activeItem;
var myLayers = thisComp.selectedLayers;
var x = thisComp.width;
var y = thisComp.height;
var randX,randY;

function getRndNum(min, max) {
  return Math.random() * (max - min) + min;
}
for(i=0; i<myLayers.length; i++){
  randX = getRndNum(0,x);
  randY = getRndNum(0,y);
  myLayers[i].property("Position").setValue([randX,randY,0]);
  // myLayers[i].property("Position").setValue([x,y])

}

Misc

Change the background color for the active comp

/* Changes the background color for the active comp to white. 
Can be customized to any color you'd like by simply changing the [1,1,1] value to reflect the appropriate RGB values...

Example colors:
[0,0,0] = Black
[0.5,0.5,0.5] = Grey
*/

app.project.activeItem.bgColor=[1,1,1];

Duplicate selected n times

prompt

app.beginUndoGroup("Duplicate Selected Layers");
var comp = app.project.activeItem;
if(comp){
var numCopies = prompt("How many copies?",5);
    if (numCopies){
	for (var i=0; i < comp.selectedLayers.length; i++) {
	for (var j=1; j <= numCopies; j++) {
	comp.selectedLayers[i].duplicate();
			}
		}
	}
}
app.endUndoGroup;

15

Kbar Scriptlets

Changes selected Solid source's color to white

{
	var activeItem = app.project.activeItem;

	if (activeItem == null || !(activeItem instanceof CompItem)) {
		alert("Select a comp before running this script");
	} else {
		if (activeItem.selectedLayers.length < 1) {
			alert("Select a solid layer before running this script");
		} else {
			solidLayer = activeItem.selectedLayers[0];
			solidLayer.source.mainSource.color = [1,1,1];
			alert("Changed solid's color to white.");
		}
	}
}

Source: Paul Tuersley, https://aenhancers.com/viewtopic.php?t=65

Change comp bg color to black > white > grey

myComp = app.project.activeItem
var bg = myComp.bgColor;
var n =0 ;

var baseColor = [0,0,0];
var col_1 = [1,1,1];
var col_2 = [.5,.5,.5];


if(bg[0]==0&&bg[1]==0&&bg[2]==0) {n=1} // black to white
if(bg[0]==1&&bg[1]==1&&bg[2]==1) {n=2} // white to grey
if(bg[0]==.5&&bg[1]==.5&&bg[2]==.5) {n=3} // grey to black


switch(n){
  case 0:
    app.project.activeItem.bgColor = baseColor;
  break;

  case 1:
    app.project.activeItem.bgColor = col_1;
    break;

	case 2:
    app.project.activeItem.bgColor = col_2;
    break;

	case 3:
    app.project.activeItem.bgColor = baseColor;
    break;
}

Arrays

Shuffle

function shuffleArray(array) {
    var currentIndex = array.length, temporaryValue, randomIndex;

    // While there remain elements to shuffle...
    while (0 !== currentIndex) {

        // Pick a remaining element...
        randomIndex = Math.floor(Math.random() * currentIndex);
        currentIndex -= 1;

        // And swap it with the current element.
        temporaryValue = array[currentIndex];
        array[currentIndex] = array[randomIndex];
        array[randomIndex] = temporaryValue;
    }

    return array;
}