set up mutationobserver to react when more results load

manifest.json

@@ -9,7 +9,7 @@
         "activeTab",
         "storage",
         "webNavigation",
-        "*://duckduckgo.com/*"
+        "*://*.duckduckgo.com/*"
     ],
 
     "page_action": {
@@ -32,7 +32,7 @@
 
     "content_scripts": [
         {
-            "matches": ["*://duckduckgo.com/*"],
+            "matches": ["*://*.duckduckgo.com/*q=*"],
             "js": ["scripts/hide-slop.js"]
         }
     ]

scripts/hide-slop.js

@@ -1,3 +1,10 @@
+const ddg_result_selector = "a[data-testid=\"result-title-a\""
+const ddg_result_list_selector = "ol.react-results--main"
+
+let result_list_node
+let result_list_observer
+const page_links = new Map()
+
 function check_links(links) {
     // send a message to background script with a list of URLs to check
     browser.runtime.sendMessage({type: "check", urls: links})
@@ -6,19 +13,43 @@ function check_links(links) {
 async function message_listener(message) {
     if(message.type === "check_result") {
         console.log(message.url, message.result)
+        page_links.set(message.url, message.result)
     }
 }
 
-function onload_handler() {
+function get_initial_links() {
     //get links
-    const links = document.querySelectorAll("a[data-testid=\"result-title-a\"")
+    const links = document.querySelectorAll(ddg_result_selector)
-    let link_targets = new Array()
     links.forEach((node) => {
-        link_targets.push(node.getAttribute("href"))
+        page_links.set(node.getAttribute("href"), undefined)
     })
     console.log(link_targets)
-    check_links(link_targets)
+    check_links(page_links.keys())
+}
+
+function update_links() {
+    // the result list has updated, add new links and check them
+}
+
+function setup_result_observer() {
+    const config = { childList: true }
+    result_list_observer = new MutationObserver(update_links)
+    result_list_observer.observe(result_list_node, config)
+}
+
+function onload_handler() {
+    // get results ol node
+    result_list_node = document.querySelector(ddg_result_list_selector)
+
+    setup_result_observer()
+
+    get_initial_links()
 }
 
 browser.runtime.onMessage.addListener(message_listener)
-addEventListener("DOMContentLoaded", onload_handler)
+
+if (document.readyState === "loading") {
+    document.addEventListener("DOMContentLoaded", onload_handler)
+} else {
+    onload_handler()
+}