const existClient = function () {
 return {
 validate: function (input) {
 const value = input.value;
 if (value === "") {
 return {
 valid: true,
 };
 } 
 if (value.length > 0) {
$.ajax({
url: "/clientes/findClient",
type: "GET",
data: {
"id": value
},
success: function (data) {
if(data.length >0){
return { 
valid: false,
}; 
}
}); 
}
return {
valid: true,
};
},
 };

validator = FormValidation.formValidation(
form,
{
fields: {
//some fields
},
plugins: {
trigger: new FormValidation.plugins.Trigger(),
bootstrap: new FormValidation.plugins.Bootstrap5({
rowSelector: ".fv-row",
 eleInvalidClass: "",
 eleValidClass: ""
}),
excluded: new FormValidation.plugins.Excluded({
excluded: function (field, ele, eles) {
if (form.querySelector("[name="" + field + ""]") === null) {
return true;
}
},
}),
}
}
).registerValidator("existClient", existClient);