frontend: Loader + Refactoring

frontend/components/FunctionCard/FunctionCard.css

@@ -11,6 +11,12 @@
     cursor: pointer;
     transition: all .3s;
 }
+.FunctionCard__container {
+    height: 100%;
+    width: 100%;
+    display: flex;
+    flex-direction: column;
+}
 .FunctionCard:hover {
     transform: translateY(-7px);
 }

frontend/components/FunctionCard/FunctionCard.js

@@ -1,11 +1,24 @@
 import Link from 'next/link';
+import { useState, Fragment } from 'react';
+import Loader from '../Loader/Loader';
 import './FunctionCard.css';
 
-const FunctionCard = (props) =>  (
+const FunctionCard = (props) => {
+
+    const [isLoading, setIsLoading] = useState(true);
+
+    const handleLoad = () => {
+        setIsLoading(false);
+    }
+
+    return (
         <Link href={`/functions/${props.slug}`}>
-        <div className="FunctionCard col-sm-24 col-md-10 col-xl-7">
+            <Fragment>
+                <div className={"FunctionCard col-sm-24 col-md-10 col-xl-7"}>
+                    {isLoading && <Loader width="100px" height="100px" />} 
+                    <div className={`FunctionCard__container ${isLoading ? "d-none" : ""}`}>
                         <div className="FunctionCard__top">
-                <img className="FunctionCard__image" alt={props.title} src={props.image} />
+                            <img onLoad={handleLoad} className="FunctionCard__image" alt={props.title} src={props.image} />
                             <h2 className="FunctionCard__title">{props.title}</h2>
                             <p className="FunctionCard__description">{props.description}</p>
                         </div>
@@ -14,7 +27,10 @@ const FunctionCard = (props) =>  (
                             <p className="FunctionCard__publication-date">{props.publicationDate}</p>
                         </div>
                     </div>
+                </div>
+            </Fragment>
         </Link>
-);
+    );
+} 
 
 export default FunctionCard;

frontend/components/Loader/Loader.css

@@ -0,0 +1,13 @@
+.Loader {
+    transform-origin: 50% 50%; animation: .9s linear 0s infinite normal forwards running Loader__spin;
+}
+
+@keyframes Loader__spin {
+    0% {
+        animation-timing-function: cubic-bezier(0.5856,0.0703,0.4143,0.9297);
+        transform: rotate(0deg);
+    }
+    100% {
+        transform: rotate(360deg);
+    }
+}

frontend/components/Loader/Loader.js

@@ -0,0 +1,11 @@
+import './Loader.css';
+
+const Loader = ({ width, height }) => (
+    <svg width={width} height={height} viewBox="0 0 100 100">
+        <g transform="translate(50 50) rotate(0) scale(1 1) translate(-50 -50)">
+            <image className="Loader" x="0" y="0" width="100" height="100" href="/images/FunctionProject_icon.png"></image>
+        </g>
+    </svg>
+);
+
+export default Loader;

frontend/hooks/useAPI.js

@@ -0,0 +1,31 @@
+import { useEffect, useState } from 'react';
+import api from '../config/api';
+
+/**
+ * @param {String} url 
+ * @param {*} defaultData 
+ * @param {String} method 
+ * @param {Object} options 
+ */
+function useAPI(url, defaultData = [], method = "get", options = {}) {
+
+    const [isLoading, setIsLoading] = useState(true);
+    const [data, setData]           = useState(defaultData);
+    const [hasError, setHasError]   = useState(false);
+
+    useEffect(() => {
+        api[method](url, options)
+            .then((result) => {
+                setData(result.data);
+                setIsLoading(false);
+            })
+            .catch((error) => {
+                setHasError(true);
+                console.error(error);
+            });
+    }, []);
+
+    return [isLoading, data, hasError];
+}
+
+export default useAPI;

frontend/pages/functions.js

@@ -1,60 +1,50 @@
 import { Fragment, useState, useEffect } from 'react';
 import HeadTag from '../components/HeadTag';
 import FunctionCard from '../components/FunctionCard/FunctionCard';
+import Loader from '../components/Loader/Loader';
 import '../public/css/pages/functions.css';
 import { API_URL } from '../config/config';
 import api from '../config/api';
+import useAPI from '../hooks/useAPI';
 
 const Functions = () => {
 
     // State de recherche et de catégories
-    const [categories, setCategories]   = useState([]);
+    const [, categories]                = useAPI('/categories');
     const [inputSearch, setInputSearch] = useState({ search: "", selectedCategory: "0" });
 
     // State pour afficher les fonctions
-    const [functions, setFunctions]                 = useState([]);
+    const [functionsData, setFunctionsData]         = useState({ hasMore: true, rows: [] });
     const [isLoadingFunctions, setLoadingFunctions] = useState(true);
     const [pageFunctions, setPageFunctions]         = useState(1);
-    const [hasMoreFunctions, sethasMoreFunctions]   = useState(false);
 
-    // Récupère les catégories
+    const getFunctionsData = () => {
-    useEffect(() => {
+        setLoadingFunctions(true);
-        api.get('/categories')
+        return new Promise(async (next) => {
-            .then((result) => {
+            const result = await api.get(`/functions?page=${pageFunctions}&limit=10&categoryId=${inputSearch.selectedCategory}&search=${inputSearch.search}`);
-                setCategories(result.data);
+            setLoadingFunctions(false);
-            })
+            next(result.data);
-            .catch((error) => console.error(error));
+        });
-    }, []);
+    }
     
     // Récupère les fonctions si la page change
     useEffect(() => {
-        api.get(`/functions?page=${pageFunctions}&limit=10&categoryId=${inputSearch.selectedCategory}&search=${inputSearch.search}`)
+        getFunctionsData().then((data) => setFunctionsData({ 
-            .then((result) => {
+            hasMore: data.hasMore, 
-                setLoadingFunctions(false);
+            rows: [...functionsData.rows, ...data.rows] 
-                sethasMoreFunctions(result.data.hasMore);
+        }));
-                setFunctions([...functions, ...result.data.rows]);
-            })
-            .catch((error) => console.error(error));
     }, [pageFunctions]);
 
     // Récupère les fonctions si la catégorie/recherche change
     useEffect(() => {
-        api.get(`/functions?page=${pageFunctions}&limit=10&categoryId=${inputSearch.selectedCategory}&search=${inputSearch.search}`)
+        getFunctionsData().then((data) => setFunctionsData(data));
-            .then((result) => {
-                setLoadingFunctions(false);
-                sethasMoreFunctions(result.data.hasMore);
-                setFunctions(result.data.rows);
-            })
-            .catch((error) => console.error(error));
     }, [inputSearch.selectedCategory, inputSearch.search]);
 
     const loadMore = () => {
-        setLoadingFunctions(true);
         setPageFunctions(pageFunctions + 1);
     }
 
     const handleChange = (event) => {
-        setLoadingFunctions(true);
         const inputSearchNew = { ...inputSearch };
         inputSearchNew[event.target.name] = event.target.value;
         setInputSearch(inputSearchNew);
@@ -84,18 +74,19 @@ const Functions = () => {
                 </div>
     
                 <div className="row justify-content-center">
-                    {functions.map((f) => (
+                    {functionsData.rows.map((f) => (
                         <FunctionCard key={f.id} slug={f.slug} image={API_URL + f.image} title={f.title} description={f.description} category={f.categorie} publicationDate={new Date(f.createdAt).toLocaleDateString('fr-FR')} />   
                     ))}
                 </div>
                 {    
-                    !isLoadingFunctions && hasMoreFunctions 
+                    isLoadingFunctions ?
-                    ? 
+                        <Loader width="100px" height="100px" />
-                        <button className="btn btn-dark" onClick={loadMore}>Charger plus de fonctions ?</button> 
+                    : functionsData.hasMore ?
-                    : !hasMoreFunctions ?
+                        <div className="row justify-content-center">
-                        null
+                            <button className="btn btn-dark" style={{marginBottom: "50px"}} onClick={loadMore}>Charger plus de fonctions ?</button> 
+                        </div>
                     :
-                    <p>Chargement...</p>
+                        null
                 }
             </div>
         </Fragment>

frontend/pages/index.js

@@ -1,7 +1,16 @@
-import { Fragment } from 'react';
+import { Fragment, useEffect } from 'react';
 import HeadTag from '../components/HeadTag';
 
-const Home = () => (
+const Home = () => {
+
+    useEffect(() => {
+        console.log(
+            '%c ⚙️ FunctionProject', 
+            'color: #ffd800; font-weight: bold; background-color: #181818;padding: 10px;border-radius: 10px;font-size: 20px'
+        );
+    }, []);
+
+    return (
         <Fragment>
             <HeadTag 
                 title="FunctionProject" 
@@ -9,8 +18,8 @@ const Home = () => (
                 image="/images/FunctionProject_icon_small.png" 
             />
             <div>Home</div>
-        {console.log('%c ⚙️ FunctionProject', 'color: #ffd800; font-weight: bold; background-color: #181818;padding: 10px;border-radius: 10px;font-size: 20px')}
         </Fragment>
-);
+    );
+}
 
 export default Home;

frontend/public/css/general.css

@@ -60,6 +60,9 @@ a, .important {
     color: var(--important);
     text-decoration: none;
 }
+.d-none {
+    display: none !important;
+}
 .form-control {
     display: block;
     height: calc(1.5em + .75rem + 2px);