first commit with existing project files

partie2-seo.js

@@ -0,0 +1,51 @@
+let text = "";
+let keyword = "";
+
+const button = document.getElementById('analyse');
+
+function wordFrequency(texte, keyword) {
+
+    const occurrencies = [];
+
+    const words = text.trim().split(/[^a-zA-Z]/);
+
+    words.forEach(word => {
+        if (word === keyword) {
+            occurrencies.push(word);
+        }
+    });
+
+    return occurrencies.length;
+}
+
+function infosHTML(htmlText) {
+
+    const infos = {};
+
+    const parser = new DOMParser();
+
+    const newDoc = parser.parseFromString(htmlText, "text/html");
+
+    infos.title = newDoc.getElementsByTagName("title")[0].textContent;
+    infos.description = newDoc.querySelector("meta[name='description']").content;
+
+    return infos;
+}
+
+button.addEventListener('click', (e) => {
+    e.preventDefault();
+    text = document.getElementById('zone-html').value;
+    keyword = document.getElementById('keyword').value;
+
+    const pageTitle = document.getElementById('page-title');
+    const pageDescription = document.getElementById('page-meta-description');
+
+    pageTitle.style.fontWeight = "normal";
+    pageTitle.innerText = infosHTML(text).title;
+
+    pageDescription.style.fontWeight = "normal";
+    pageDescription.innerText = infosHTML(text).description;
+
+    const keywordNumber = document.getElementById('keyword-number');
+    keywordNumber.innerText = `Nombre d'occurrences de "${keyword}" : ${wordFrequency(text, keyword)}`;
+});