Initial state

js/fetchlib.js

@@ -0,0 +1,44 @@
+var submit = function (url, data) {
+    // create a form
+    var form = document.createElement('form');
+    form.method = 'POST';
+    form.action = url;
+    form.style.display = 'none';
+
+    // add the form data to the form
+    for (var key in data) {
+        var input = document.createElement('input');
+        input.type = 'hidden';
+        input.name = key;
+        input.value = data[key];
+        form.appendChild(input);
+    }
+
+    // submit the form
+    document.body.appendChild(form);
+    form.submit();
+}
+
+var toFormData = function (obj) {
+    var formData = new FormData();
+    for (var key in obj) {
+        formData.append(key, obj[key]);
+    }
+    return formData;
+}
+var fetchPHP = async function (url, data = {}) {
+    return response = await fetch(
+        url,
+        { method: 'POST', body: toFormData(data) }
+    )
+        .then(response => {
+            try {
+                return response.json()
+            }
+            catch (e) {
+                var message = 'Error en la respuesta del servidor';
+                Promise.reject(message)
+            }
+        })
+        .then(response => response.error ? Promise.reject(response.error) : Promise.resolve(response))
+}