Add dropdown box to navigate between versions.

main/index.html

@@ -7,9 +7,11 @@
 <title>CMSIS-DSP: CMSIS DSP Software Library</title>
 <link href="tabs.css" rel="stylesheet" type="text/css"/>
 <link href="cmsis.css" rel="stylesheet" type="text/css" />
+<link href="../version.css" rel="stylesheet" type="text/css" />
 <script type="text/javascript" src="jquery.js"></script>
 <script type="text/javascript" src="dynsections.js"></script>
 <script type="text/javascript" src="footer.js"></script>
+<script type="text/javascript" src="../version.js"></script>
 <link href="navtree.css" rel="stylesheet" type="text/css"/>
 <script type="text/javascript" src="resize.js"></script>
 <script type="text/javascript" src="navtree.js"></script>
@@ -32,9 +34,10 @@
   <td id="projectlogo"><img alt="Logo" src="CMSIS_Logo_Final.png"/></td>
   <td style="padding-left: 0.5em;">
    <div id="projectname">CMSIS-DSP
-   &#160;<span id="projectnumber"><script type="text/javascript">
+   &#160;<span id="projectnumber" class=""><script type="text/javascript">
      <!--
      writeHeader.call(this);
+     writeVersionDropdown(this);
      //-->
     </script> 
    </span>

v1.10.1/index.html

@@ -7,9 +7,11 @@
 <title>CMSIS-DSP: CMSIS DSP Software Library</title>
 <link href="tabs.css" rel="stylesheet" type="text/css"/>
 <link href="cmsis.css" rel="stylesheet" type="text/css" />
+<link href="../version.css" rel="stylesheet" type="text/css" />
 <script type="text/javascript" src="jquery.js"></script>
 <script type="text/javascript" src="dynsections.js"></script>
 <script type="text/javascript" src="footer.js"></script>
+<script type="text/javascript" src="../version.js"></script>
 <link href="navtree.css" rel="stylesheet" type="text/css"/>
 <script type="text/javascript" src="resize.js"></script>
 <script type="text/javascript" src="navtree.js"></script>
@@ -32,9 +34,10 @@
   <td id="projectlogo"><img alt="Logo" src="CMSIS_Logo_Final.png"/></td>
   <td style="padding-left: 0.5em;">
    <div id="projectname">CMSIS-DSP
-   &#160;<span id="projectnumber"><script type="text/javascript">
+   &#160;<span id="projectnumber" class=""><script type="text/javascript">
      <!--
      writeHeader.call(this);
+     writeVersionDropdown(this);
      //-->
     </script> 
    </span>

version.css

@@ -0,0 +1,44 @@
+/* Dropdown Button */
+.dropbtn {
+    margin: 0px;
+    padding: 0px 0px 0px 1em;
+    background-image: url(dropdown.png);
+    background-repeat: no-repeat;
+    background-size: 0.75em;
+    background-position: left center;
+}
+
+/* Dropdown button on hover & focus */
+.dropbtn:hover, .dropbtn:focus {
+  background-color: #2980B9;
+}
+
+/* The container <div> - needed to position the dropdown content */
+.dropdown {
+  position: relative;
+  display: inline-block;
+}
+
+/* Dropdown Content (Hidden by Default) */
+.dropdown-content {
+  display: none;
+  position: absolute;
+  background-color: #f1f1f1;
+  min-width: 160px;
+  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
+  z-index: 1;
+}
+
+/* Links inside the dropdown */
+.dropdown-content a {
+  color: black;
+  padding: 4px 6px;
+  text-decoration: none;
+  display: block;
+}
+
+/* Change color of dropdown links on hover */
+.dropdown-content a:hover {background-color: #ddd}
+
+/* Show the dropdown menu (use JS to add this class to the .dropdown-content container when the user clicks on the dropdown button) */
+.show {display:block;}

version.js

@@ -0,0 +1,52 @@
+const versions = {
+    "main": "v1.10.2-dev1+g4b4c680 (main)",
+    "v1.10.1": "v1.10.1 (latest)" 
+};
+
+var scripts = document.getElementsByTagName("script"),
+scriptUrl = new URL(scripts[scripts.length-1].src);
+docUrl = new URL(document.URL);
+baseUrl = new URL(scriptUrl)
+baseUrl.pathname = baseUrl.pathname.split('/').slice(0,-1).join("/")
+
+function urlForVersion(url, version) {
+    url = new URL(url);
+    pathname = url.pathname.replace(baseUrl.pathname, "");
+    parts = pathname.split("/");
+    parts[1] = version;
+    url.pathname = baseUrl.pathname + parts.join("/");
+    return url
+}
+
+function writeVersionDropdown() {
+    currentVersion = document.currentScript.parentNode.innerText;
+    document.currentScript.parentNode.classList.add("dropdown");
+    document.currentScript.parentNode.innerText = "";
+    document.write('  <span onclick="myFunction()" class="dropbtn">'+currentVersion+'</span>');
+    document.write('  <div id="myDropdown" class="dropdown-content">'); 
+    for(var version in versions) {
+        var label = versions[version];
+        document.write('    <a href="'+urlForVersion(docUrl, version)+'">'+label+'</a>');
+    }
+    document.write('  </div>');
+};
+
+/* When the user clicks on the button,
+toggle between hiding and showing the dropdown content */
+function myFunction() {
+  document.getElementById("myDropdown").classList.toggle("show");
+}
+
+// Close the dropdown menu if the user clicks outside of it
+window.onclick = function(event) {
+  if (!event.target.matches('.dropbtn')) {
+    var dropdowns = document.getElementsByClassName("dropdown-content");
+    var i;
+    for (i = 0; i < dropdowns.length; i++) {
+      var openDropdown = dropdowns[i];
+      if (openDropdown.classList.contains('show')) {
+        openDropdown.classList.remove('show');
+      }
+    }
+  }
+}