<async-editable-field
    id="myField"
    name="fieldName"
    value="Field Value" 
    url="http://localhost:8085/endpoint/"
    save-text="Update"
    cancel-text="Cancel">
</async-editable-field>

<script>
    var editableField = document.querySelector('async-editable-field#myField');

    editableField._setSuccessResponseFunction(function(response) {
      alert("Success: " + response);
    });

    editableField._setErrorResponseFunction(function(response, status) {
      alert("[" + status + "] Response: " + response);
    });
        
    editableField._setValidationFunction(function(value) {
        var reg = new RegExp(/^\d+$/);
        if (!reg.test(value)) {
            alert("Value must only contain numbers!");
            return false;
        }
        return true;
    });
</script>