A JS script for CAPTCHA refreshing.

homepage/static/assets/js/captcha_refresh.js

@@ -0,0 +1,30 @@
+const captcha_span = document.getElementsByClassName("captcha")[0];
+const captcha_img = captcha_span.children[1];
+
+captcha_span.children[3].innerHTML
+    = `<button id="refresh">Refresh</button>ed in <b><span id="remain">600</span></b> seconds.`;
+
+const captcha_refresh = document.getElementById("refresh");
+const captcha_remain = document.getElementById("remain");
+
+const g_captcha_timeout_seconds = 600;
+let g_captcha_timeout_remain = g_captcha_timeout_seconds;
+
+async function newCaptcha() {
+    const id = await fetch("/captcha/").then(r => r.text());
+    setTimeout(() => { captcha_img.src = `/captcha/${id}/image` }, 400);
+    g_captcha_timeout_remain = g_captcha_timeout_seconds;
+}
+
+captcha_span.classList.toggle("refresh");
+captcha_refresh.classList.toggle("refresh");
+captcha_refresh.addEventListener("click", async e => {
+    e.preventDefault();
+    await newCaptcha();
+});
+
+setInterval(async () => {
+    captcha_remain.innerText = g_captcha_timeout_remain--;
+    if (g_captcha_timeout_remain == 0)
+        await newCaptcha();
+}, 1000);