X-Git-Url: http://git.cyclocoop.org/?p=velocampus%2Fweb%2Fwww.git;a=blobdiff_plain;f=www%2Fsquelettes%2Fjavascript%2Fsmoothscroll.js;fp=www%2Fsquelettes%2Fjavascript%2Fsmoothscroll.js;h=9b8d4a095a45073c24655dc6b244ca30f8ce3777;hp=0000000000000000000000000000000000000000;hb=80b4d3e85f78d402ed2e73f8f5d1bf4c19962eed;hpb=aaf970bf4cdaf76689ecc10609048e18d073820c

diff --git a/www/squelettes/javascript/smoothscroll.js b/www/squelettes/javascript/smoothscroll.js
new file mode 100644
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+++ b/www/squelettes/javascript/smoothscroll.js
@@ -0,0 +1,145 @@
+// JavaScript Document
+/* Smooth scrolling
+   Changes links that link to other parts of this page to scroll
+   smoothly to those links rather than jump to them directly, which
+   can be a little disorienting.
+   
+   sil, http://www.kryogenix.org/
+   
+   v1.0 2003-11-11
+   v1.1 2005-06-16 wrap it up in an object
+*/
+
+var ss = {
+  fixAllLinks: function() {
+    // Get a list of all links in the page
+    var allLinks = document.getElementsByTagName('a');
+    // Walk through the list
+    for (var i=0;i<allLinks.length;i++) {
+      var lnk = allLinks[i];
+      if ((lnk.href && lnk.href.indexOf('#') != -1) && 
+          ( (lnk.pathname == location.pathname) ||
+	    ('/'+lnk.pathname == location.pathname) ) && 
+          (lnk.search == location.search)) {
+        // If the link is internal to the page (begins in #)
+        // then attach the smoothScroll function as an onclick
+        // event handler
+        ss.addEvent(lnk,'click',ss.smoothScroll);
+      }
+    }
+  },
+
+  smoothScroll: function(e) {
+    // This is an event handler; get the clicked on element,
+    // in a cross-browser fashion
+    if (window.event) {
+      target = window.event.srcElement;
+    } else if (e) {
+      target = e.target;
+    } else return;
+
+    // Make sure that the target is an element, not a text node
+    // within an element
+    if (target.nodeName.toLowerCase() != 'a') {
+      target = target.parentNode;
+    }
+  
+    // Paranoia; check this is an A tag
+    if (target.nodeName.toLowerCase() != 'a') return;
+  
+    // Find the <a name> tag corresponding to this href
+    // First strip off the hash (first character)
+    anchor = target.hash.substr(1);
+    // Now loop all A tags until we find one with that name
+    var allLinks = document.getElementsByTagName('a');
+    var destinationLink = null;
+    for (var i=0;i<allLinks.length;i++) {
+      var lnk = allLinks[i];
+      if (lnk.name && (lnk.name == anchor)) {
+        destinationLink = lnk;
+        break;
+      }
+    }
+  
+    // If we didn't find a destination, give up and let the browser do
+    // its thing
+    if (!destinationLink) return true;
+  
+    // Find the destination's position
+    var destx = destinationLink.offsetLeft; 
+    var desty = destinationLink.offsetTop;
+    var thisNode = destinationLink;
+    while (thisNode.offsetParent && 
+          (thisNode.offsetParent != document.body)) {
+      thisNode = thisNode.offsetParent;
+      destx += thisNode.offsetLeft;
+      desty += thisNode.offsetTop;
+    }
+  
+    // Stop any current scrolling
+    clearInterval(ss.INTERVAL);
+  
+    cypos = ss.getCurrentYPos();
+  
+    ss_stepsize = parseInt((desty-cypos)/ss.STEPS);
+    ss.INTERVAL =
+setInterval('ss.scrollWindow('+ss_stepsize+','+desty+',"'+anchor+'")',10);
+  
+    // And stop the actual click happening
+    if (window.event) {
+      window.event.cancelBubble = true;
+      window.event.returnValue = false;
+    }
+    if (e && e.preventDefault && e.stopPropagation) {
+      e.preventDefault();
+      e.stopPropagation();
+    }
+  },
+
+  scrollWindow: function(scramount,dest,anchor) {
+    wascypos = ss.getCurrentYPos();
+    isAbove = (wascypos < dest);
+    window.scrollTo(0,wascypos + scramount);
+    iscypos = ss.getCurrentYPos();
+    isAboveNow = (iscypos < dest);
+    if ((isAbove != isAboveNow) || (wascypos == iscypos)) {
+      // if we've just scrolled past the destination, or
+      // we haven't moved from the last scroll (i.e., we're at the
+      // bottom of the page) then scroll exactly to the link
+      window.scrollTo(0,dest);
+      // cancel the repeating timer
+      clearInterval(ss.INTERVAL);
+      // and jump to the link directly so the URL's right
+      location.hash = anchor;
+    }
+  },
+
+  getCurrentYPos: function() {
+    if (document.body && document.body.scrollTop)
+      return document.body.scrollTop;
+    if (document.documentElement && document.documentElement.scrollTop)
+      return document.documentElement.scrollTop;
+    if (window.pageYOffset)
+      return window.pageYOffset;
+    return 0;
+  },
+
+  addEvent: function(elm, evType, fn, useCapture) {
+    // addEvent and removeEvent
+    // cross-browser event handling for IE5+,  NS6 and Mozilla
+    // By Scott Andrew
+    if (elm.addEventListener){
+      elm.addEventListener(evType, fn, useCapture);
+      return true;
+    } else if (elm.attachEvent){
+      var r = elm.attachEvent("on"+evType, fn);
+      return r;
+    } else {
+      alert("Handler could not be removed");
+    }
+  } 
+}
+
+ss.STEPS = 25;
+
+ss.addEvent(window,"load",ss.fixAllLinks);