Example: Animate text with multiple selectors

This example uses the selectorValue parameter with the Wiggly selector to make a string of characters flash on and off randomly.

Create a new composition.
Create a new text layer.
In the Timeline panel, choose Opacity from the text layer’s Animate menu.
Expand the text layer and its animator in the Timeline panel.
Select the Range Selector and delete it.
Choose Add > Selector > Wiggly next to the text layer’s Animator property group.
Choose Add > Selector > Expression. If the Wiggly selector doesn’t come before the Expression selector, drag the Wiggly selector above the Expression selector.
Expand the Expression Selector.
Expand the Amount property to reveal the expression. The following expression appears by default:
```
selectorValue * textIndex/textTotal
```

Replace the default expression text with the following expression:

r_val=selectorValue[0];
if(r_val < 50)r_val=0;
if(r_val > 50)r_val=100;
r_val

AfterEffects