I'm wondering if it's possible to create a HTML page View that would be used as a form with javascript?

I would write in that page:

<script>
function myFunction()
{

//send request to external website (or ZohoCRM) and receive response data

//if ok then:
alert("Your request was successfuly processed!");
}
</script>

<form ...>

<input type="button" onclick="myFunction()" value="Submit" />

</form>