Determine when caret reaches the end of input box

Question

I have found this question which provides a solution to compute the exact position of the caret in a text or input box.

For my purposes, this is overkill. I only want to know when the caret is at the end of all the text of an input box. Is there an easy way to do that?

Answer 1

In all modern browsers:

//input refers to the text box
if(input.value.length == input.selectionEnd){
    //Caret at end.
}

The selectionEnd property of an input element equals the highest selection index.

Answer 2

<script>
input = document.getElementById('yourinputfieldsid');
if(input.selectionEnd == input.selectionStart && input.value.length == input.selectionEnd){
//your stuff
}
</script>

This checks to see if the caret actually is at the end, and makes sure that it isn't only because of the selection that it shows an end value.