feat: AJAX loading with loading animation

html/index.php

@@ -9,16 +9,26 @@ function renderChoice(): void {
     [$left, $right] = [$_SESSION["left"], $_SESSION["right"]];
 
     $csrfToken = $_SESSION["csrfToken"];
+
+    if (isset($_GET["ajax"])) {
+        include __DIR__ . "/../view/fragments/mobSelection.php";
+    } else {
         $title = "Test";
         $content = function() use ($left, $right, $csrfToken) {
             include __DIR__ . "/../view/fragments/mobSelection.php";
         };
 
         include __DIR__ . "/../view/layout.php";
+    }
 }
 
 function reload(): void {
+    if (isset($_GET["ajax"])) {
+        header("LOCATION: ?ajax");
+    } else {
         header("LOCATION: /");
+    }
+
     http_send_status(303);
 }
 

html/styles/main.css

@@ -30,14 +30,44 @@ h1 {
     position: relative;
 }
 
-.separator div {
+.separator .or, .separator .spinner {
     position: absolute;
     top: 50%;
     width: 100%;
     text-align: center;
     transform: translate(0%, -50%);
+    opacity: 1;
+    transition: opacity 0.5s;
 }
 
+.separator .spinner {
+    opacity: 0;
+}
+
+.img-preload .spinner {
+    opacity: 1;
+}
+.img-preload .or {
+    opacity: 0;
+}
+
+.separator .spinner img {
+    animation-name: spinner;
+    animation-duration: 1s;
+    animation-iteration-count: infinite;
+    animation-timing-function: cubic-bezier(0.68, -0.6, 0.32, 1.6);
+}
+
+@keyframes spinner {
+    0% {
+        transform: rotate(0deg);
+    }
+    100% {
+        transform: rotate(360deg);
+    }
+}
+
+
 .mob {
     width: 40vw;
     height: 42vw;

resources/js/htmx.js

@@ -0,0 +1,5 @@
+import htmx from 'htmx.org';
+
+console.log("htmx loaded");
+//htmx.logAll();
+window.htmx = htmx;

resources/js/img-preload.ext.js

@@ -0,0 +1,48 @@
+import htmx from 'htmx.org';
+
+console.log("module loaded");
+
+htmx.defineExtension('img-preload', {
+    onEvent: (name, event) => {
+        if (event.target.getAttribute("hx-ext") !== "img-preload") {
+            return;
+        }
+
+        const spinner = [...document.querySelectorAll(
+            event.target.getAttribute("data-preload-spinner")
+            ?? ".img-preload"
+        )];
+
+        switch (name) {
+            case 'htmx:trigger':
+                spinner.forEach(s => s.classList.add("img-preload"));
+                break;
+            case 'htmx:beforeOnLoad':
+                event.detail.shouldSwap = false;
+
+                const parser = new DOMParser();
+                const doc = parser.parseFromString(event.detail.xhr.response, 'text/html');
+                const imagePromises = [...doc.getElementsByTagName('img')]
+                    .map(img => img.src)
+                    .map(src => new Promise((resolve, reject) => {
+                        const image = new Image();
+                        image.onload = resolve;
+                        image.onerror = reject;
+                        image.src = src;
+                    }));
+
+                Promise.all(imagePromises)
+                    .then(() => {
+                        spinner.forEach(s => s.classList.remove("img-preload"));
+                        htmx.swap(event.detail.target, event.detail.xhr.response, {
+                            swapStyle: "outerHTML",
+                            transition: true,
+                        });
+                    })
+                    .catch(error => {
+                        console.error('Error loading images:', error);
+                    });
+                break;
+        }
+    }
+});

resources/js/index.js

@@ -1,3 +1,2 @@
-import htmx from 'htmx.org';
-
-window.htmx = htmx;
+import './htmx';
+import './img-preload.ext';

resources/js/package-lock.json

@@ -9,7 +9,7 @@
       "version": "0.0.1",
       "license": "MIT",
       "dependencies": {
-        "htmx.org": "^1.9.12"
+        "htmx.org": "^2.0.1"
       },
       "devDependencies": {
         "esbuild": "0.23.0"
@@ -439,9 +439,9 @@
       }
     },
     "node_modules/htmx.org": {
-      "version": "1.9.12",
-      "resolved": "https://registry.npmjs.org/htmx.org/-/htmx.org-1.9.12.tgz",
-      "integrity": "sha512-VZAohXyF7xPGS52IM8d1T1283y+X4D+Owf3qY1NZ9RuBypyu9l8cGsxUMAG5fEAb/DhT7rDoJ9Hpu5/HxFD3cw=="
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/htmx.org/-/htmx.org-2.0.1.tgz",
+      "integrity": "sha512-wO/rWlveSLD2mzRS9Em0v5hlsi6r21iUvaS17GPMgehBbM7eoQmqGQCkscsM67poF24zONgq3gQv+q/cgCHn2w=="
     }
   }
 }

resources/js/package.json

@@ -10,7 +10,7 @@
   "author": "",
   "license": "MIT",
   "dependencies": {
-    "htmx.org": "^1.9.12"
+    "htmx.org": "^2.0.1"
   },
   "devDependencies": {
     "esbuild": "0.23.0"

view/fragments/mob.php

@@ -3,9 +3,11 @@
     $mob ??= [];
     $csrfToken ??= "";
 ?>
-<form action="?<?= $side ?>" method="POST" name="<?= $side ?>" id="form-<?= $side ?>">
+<form action="?<?= $side ?>" method="POST" name="<?= $side ?>" id="form-<?= $side ?>"
+      hx-post="?<?= $side ?>&ajax" hx-target=".choice" hx-swap="outerHTML"
+      hx-ext="img-preload" data-preload-spinner=".separator">
     <input type="hidden" name="csrfToken" value="<?= $csrfToken ?>">
-    <div class="mob" onclick="document.forms['<?= $side ?>'].submit()">
+    <div class="mob" onclick="htmx.trigger(document.forms['<?= $side ?>'], 'submit', {})">
         <h2><?= $mob["name"]; ?></h2>
         <img alt="<?= $mob["name"]; ?>" src="/images/mobs/<?= $mob["image"] ?? "_placeholder.png"; ?>">
     </div>

view/fragments/mobSelection.php

@@ -1,20 +1,25 @@
-<h1>
+<div class="choice">
+    <h1>
         Which do you like better?
-</h1>
-<div class="selection">
+    </h1>
+    <div class="selection">
         <?php
             $mob = $left ?? [];
             $side = "left";
             include __DIR__ . "/mob.php";
         ?>
         <div class="separator">
-        <div>
+            <div class="or">
                 OR
             </div>
+            <div class="spinner">
+                <img src="/images/gras.png" alt="spinner" />
+            </div>
         </div>
         <?php
             $mob = $right ?? [];
             $side = "right";
             include __DIR__ . "/mob.php";
         ?>
+    </div>
 </div>