# Chaining

Sometimes we may need to chain multiple animations in a controlled way to achieve the desired effect. I2Djs provides a couple of chaining APIs, **sequenceChain** and **parallelChain,** to chain one or more animations sequentially / parallel respectively.  Chaining APIs provides great control in implementing complex animations easily. 

It even allows nested chaining - one chain within another.

Chaining methods are available as a part of I2D Object space.

Or It can be imported as below.

```
import {chain} from 'i2djs';
```

## APIs

### I2d.sequenceChain()

```
let ChainInstance = i2d.chain.sequenceChain()
```

sequenceChain is used to perform one or more animations in sequential order.

### I2d.parallelChain()

```
let ChainInstance = i2d.chain.parallelChain()
```

parallelChain is used to perform one or more animations simultaneously.

## ChainInstance APIs

**#.add(); -** Add anime executables to the chain instance. Anime executables can be obtained using - **animateExe** method. 

Example: 

```
chain.add(node.animateExe({
			duration: 1000,
			ease: 'easeInOutSin',
			attr: {
				x2: da.x,
				y2: da.y
			},
			end: function (d) {
				render(d);
			}
		}));
```

**#.duration(***Milliseconds***); -** Set chain duration in milliseconds. Entire chain will be completed in the specified duration. In the case of a sequential chain, the duration gets split among the animations. whereas in a parallel chain, all animations get the same duration.

**#.loop(***Number***); -** Number of times chain needs to be executed**.**

**#.end(***exec***); -** On end of the chain execution, ***exec*** function will be called.

**#.direction(); -** Direction in which the chain execution should take place. **Default** - First child to last, **Reverse** - Last child to first.

**#.start(); -** A method to invoke the chain execution. 


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