.floatwindow.open()
This API would let you invoke a method right after a visitor opens the chat window.
Syntax:
Copied$zoho.salesiq.floatwindow.open(function(){ });
Example
Copied<script>
$zoho.salesiq.ready=function(embedinfo)
{
$zoho.salesiq.floatwindow.open(function(){
#insert your code here
})
}
</script>