Postcode direct laden na invoer

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function Blank_TextField_Validator() {
    // Check the value of the element named text_name from the form named text_form
    if (text_form.text_name.value == "") {
        // If null display and alert box
        alert("U heeft geen postcode gegevens ingevuld.");
        // Place the cursor on the field for revision
        text_form.text_name.focus();
        // return false to stop further processing
        return (false);
    }
    // If text_name is not null continue processing
    if (text_form.text_name.value == "7605")
   document.getElementById("demo").innerHTML = "Postcode 7605";
    else if (text_form.text_name.value == "7607")
   document.getElementById("demo").innerHTML = "Postcode 7607";
  

    else if (text_form.text_name.value == "under")
        window.open('underconstruction.htm');
    else
        alert("Wij bezorgen niet in uw postcode. Franschise nemer worden? Neem contact op.");
    return (false);
}
-->
</script>