Add attachLink method with test

src/scripts/lib/proto/attach-link.js

@@ -0,0 +1,76 @@
+require("../../polyfills/Function.prototype.bind")
+
+var on = require("../events/on")
+var clone = require("../clone")
+
+var attrClick = "data-pjax-click-state"
+var attrKey = "data-pjax-keyup-state"
+
+var linkAction = function(el, event) {
+  // Don’t break browser special behavior on links (like page in new window)
+  if (event.which > 1 || event.metaKey || event.ctrlKey || event.shiftKey || event.altKey) {
+    el.setAttribute(attrClick, "modifier")
+    return
+  }
+
+  // we do test on href now to prevent unexpected behavior if for some reason
+  // user have href that can be dynamically updated
+
+  // Ignore external links.
+  if (el.protocol !== window.location.protocol || el.host !== window.location.host) {
+    el.setAttribute(attrClick, "external")
+    return
+  }
+
+  // Ignore click if we are on an anchor on the same page
+  if (el.pathname === window.location.pathname && el.hash.length > 0) {
+    el.setAttribute(attrClick, "anchor-present")
+    return
+  }
+
+  // Ignore anchors on the same page (keep native behavior)
+  if (el.hash && el.href.replace(el.hash, "") === window.location.href.replace(location.hash, "")) {
+    el.setAttribute(attrClick, "anchor")
+    return
+  }
+
+  // Ignore empty anchor "foo.html#"
+  if (el.href === window.location.href.split("#")[0] + "#") {
+    el.setAttribute(attrClick, "anchor-empty")
+    return
+  }
+
+  event.preventDefault()
+
+  // don’t do "nothing" if user try to reload the page by clicking the same link twice
+  if (el.href === window.location.href.split("#")[0]) {
+    el.setAttribute(attrClick, "refresh")
+    this.refresh()
+    return
+  }
+
+  el.setAttribute(attrClick, "load")
+  this.loadUrl(el.href, clone(this.options))
+}
+
+module.exports = function(el) {
+  var instance = this
+
+  on(el, "click", function(event) {
+    linkAction.call(instance, el, event)
+  })
+
+  on(el, "keyup", function(event) {
+
+    // Don’t break browser special behavior on links (like page in new window)
+    if (event.which > 1 || event.metaKey || event.ctrlKey || event.shiftKey || event.altKey) {
+      el.setAttribute(attrKey, "modifier")
+      return
+    }
+
+    if(event.keyCode == 13) {
+      linkAction.call(instance, el, event)
+    }
+
+  }.bind(this))
+}