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<main role=“main” aria-label=“Page doc/js/navigation.js”>

<pre>Navigation allows movement using the arrow keys through the search results.

When using this library you will need to set scrollIntoView to the appropriate function for your layout. Use scrollInWindow if the container is not scrollable and scrollInElement if the container is a separate scrolling region.</pre>

<p>Navigation = new function() {</p>

<pre>this.initNavigation = function() {

var _this = this;

$(document).keydown(function(e) {
  _this.onkeydown(e);
}).keyup(function(e) {
  _this.onkeyup(e);
});

this.navigationActive = true;

}

this.setNavigationActive = function(state) {

this.navigationActive = state;
this.clearMoveTimeout();

}

this.onkeyup = function(e) {

if (!this.navigationActive) return;

switch(e.keyCode) {
  case 37: //Event.KEY_LEFT:
  case 38: //Event.KEY_UP:
  case 39: //Event.KEY_RIGHT:
  case 40: //Event.KEY_DOWN:
    this.clearMoveTimeout();
    break;
}

}

this.onkeydown = function(e) {

if (!this.navigationActive) return;
switch(e.keyCode) {
  case 37: //Event.KEY_LEFT:
    if (this.moveLeft()) e.preventDefault();
    break;
  case 38: //Event.KEY_UP:
    if (e.keyCode == 38 || e.ctrlKey) {
      if (this.moveUp()) e.preventDefault();
      this.startMoveTimeout(false);
    }
    break;
  case 39: //Event.KEY_RIGHT:
    if (this.moveRight()) e.preventDefault();
    break;
  case 40: //Event.KEY_DOWN:
    if (e.keyCode == 40 || e.ctrlKey) {
      if (this.moveDown()) e.preventDefault();
      this.startMoveTimeout(true);
    }
    break;
  case 13: //Event.KEY_RETURN:
    if (this.$current)
      e.preventDefault();
      this.select(this.$current);
    break;
}
if (e.ctrlKey &amp;&amp; e.shiftKey) this.select(this.$current);

}

this.clearMoveTimeout = function() {

clearTimeout(this.moveTimeout);
this.moveTimeout = null;

}

this.startMoveTimeout = function(isDown) {

if (!$.browser.mozilla &amp;&amp; !$.browser.opera) return;
if (this.moveTimeout) this.clearMoveTimeout();
var _this = this;

var go = function() {
  if (!_this.moveTimeout) return;
  _this[isDown ? &#39;moveDown&#39; : &#39;moveUp&#39;]();
  _this.moveTimout = setTimeout(go, 100);
}
this.moveTimeout = setTimeout(go, 200);

}

this.moveRight = function() { }

this.moveLeft = function() { }

this.move = function(isDown) { }

this.moveUp = function() {

return this.move(false);

}

this.moveDown = function() {

return this.move(true);

}

/*

 Scrolls to the given element in the scrollable element view.
/

this.scrollInElement = function(element, view) {

var offset, viewHeight, viewScroll, height;
offset = element.offsetTop;
height = element.offsetHeight;
viewHeight = view.offsetHeight;
viewScroll = view.scrollTop;

if (offset - viewScroll + height &gt; viewHeight) {
  view.scrollTop = offset - viewHeight + height;
}
if (offset &lt; viewScroll) {
  view.scrollTop = offset;
}

}

/*

 Scrolls to the given element in the window.  The second argument is
 ignored
/

this.scrollInWindow = function(element, ignored) {

var offset, viewHeight, viewScroll, height;
offset = element.offsetTop;
height = element.offsetHeight;
viewHeight = window.innerHeight;
viewScroll = window.scrollY;

if (offset - viewScroll + height &gt; viewHeight) {
  window.scrollTo(window.scrollX, offset - viewHeight + height);
}
if (offset &lt; viewScroll) {
  window.scrollTo(window.scrollX, offset);
}

}</pre>

<p>}</p> </main>

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