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<div id=Content><div class="CClass"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="OpenLayers.Control.NavigationHistory"></a>OpenLayers.<wbr>Control.<wbr>NavigationHistory</h1><div class=CBody><p>A navigation history control. This is a meta-control, that creates two dependent controls: <a href="#OpenLayers.Control.NavigationHistory.previous" class=LProperty id=link21 onMouseOver="ShowTip(event, 'tt2', 'link21')" onMouseOut="HideTip('tt2')">previous</a> and <a href="#OpenLayers.Control.NavigationHistory.next" class=LProperty id=link22 onMouseOver="ShowTip(event, 'tt3', 'link22')" onMouseOut="HideTip('tt3')">next</a>. Call the trigger method on the <a href="#OpenLayers.Control.NavigationHistory.previous" class=LProperty id=link23 onMouseOver="ShowTip(event, 'tt2', 'link23')" onMouseOut="HideTip('tt2')">previous</a> and <a href="#OpenLayers.Control.NavigationHistory.next" class=LProperty id=link24 onMouseOver="ShowTip(event, 'tt3', 'link24')" onMouseOut="HideTip('tt3')">next</a> controls to restore previous and next history states. The previous and next controls will become active when there are available states to restore and will become deactive when there are no states to restore.</p><h4 class=CHeading>Inherits from</h4><ul><li><a href="../Control-js.html#OpenLayers.Control" class=LClass id=link25 onMouseOver="ShowTip(event, 'tt1', 'link25')" onMouseOut="HideTip('tt1')">OpenLayers.Control</a></li></ul><!--START_ND_SUMMARY--><div class=Summary><div class=STitle>Summary</div><div class=SBorder><table border=0 cellspacing=0 cellpadding=0 class=STable><tr class="SMain"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory" >OpenLayers.<wbr>Control.<wbr>NavigationHistory</a></td><td class=SDescription>A navigation history control. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.type" >type</a></td><td class=SDescription>{String} Note that this control is not intended to be added directly to a control panel. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.previous" >previous</a></td><td class=SDescription>{<a href="../Control-js.html#OpenLayers.Control" class=LClass id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">OpenLayers.Control</a>} A button type control whose trigger method restores the previous state managed by this control.</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.previousOptions" >previousOptions</a></td><td class=SDescription>{Object} Set this property on the options argument of the constructor to set optional properties on the <a href="#OpenLayers.Control.NavigationHistory.previous" class=LProperty id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">previous</a> control.</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.next" >next</a></td><td class=SDescription>{<a href="../Control-js.html#OpenLayers.Control" class=LClass id=link3 onMouseOver="ShowTip(event, 'tt1', 'link3')" onMouseOut="HideTip('tt1')">OpenLayers.Control</a>} A button type control whose trigger method restores the next state managed by this control.</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.nextOptions" >nextOptions</a></td><td class=SDescription>{Object} Set this property on the options argument of the constructor to set optional properties on the <a href="#OpenLayers.Control.NavigationHistory.next" class=LProperty id=link4 onMouseOver="ShowTip(event, 'tt3', 'link4')" onMouseOut="HideTip('tt3')">next</a> control.</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.limit" >limit</a></td><td class=SDescription>{Integer} Optional limit on the number of history items to retain. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.autoActivate" >autoActivate</a></td><td class=SDescription>{Boolean} Activate the control when it is added to a map. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.clearOnDeactivate" >clearOnDeactivate</a></td><td class=SDescription>{Boolean} Clear the history when the control is deactivated. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.registry" >registry</a></td><td class=SDescription>{Object} An object with keys corresponding to event types. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.nextStack" >nextStack</a></td><td class=SDescription>{Array} Array of items in the history.</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.previousStack" >previousStack</a></td><td class=SDescription>{Array} List of items in the history. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.listeners" >listeners</a></td><td class=SDescription>{Object} An object containing properties corresponding to event types. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.restoring" >restoring</a></td><td class=SDescription>{Boolean} Currently restoring a history state. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.Constructor" >Constructor</a></td><td class=SDescription></td></tr><tr class="SConstructor SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.OpenLayers.Control.NavigationHistory" >OpenLayers.<wbr>Control.<wbr>NavigationHistory</a></td><td class=SDescription></td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.onPreviousChange" id=link5 onMouseOver="ShowTip(event, 'tt4', 'link5')" onMouseOut="HideTip('tt4')">onPreviousChange</a></td><td class=SDescription>Called when the previous history stack changes.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.onNextChange" id=link6 onMouseOver="ShowTip(event, 'tt5', 'link6')" onMouseOut="HideTip('tt5')">onNextChange</a></td><td class=SDescription>Called when the next history stack changes.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.destroy" id=link7 onMouseOver="ShowTip(event, 'tt6', 'link7')" onMouseOut="HideTip('tt6')">destroy</a></td><td class=SDescription>Destroy the control.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.setMap" id=link8 onMouseOver="ShowTip(event, 'tt7', 'link8')" onMouseOut="HideTip('tt7')">setMap</a></td><td class=SDescription>Set the map property for the control and <a href="#OpenLayers.Control.NavigationHistory.previous" class=LProperty id=link9 onMouseOver="ShowTip(event, 'tt2', 'link9')" onMouseOut="HideTip('tt2')">previous</a> and <a href="#OpenLayers.Control.NavigationHistory.next" class=LProperty id=link10 onMouseOver="ShowTip(event, 'tt3', 'link10')" onMouseOut="HideTip('tt3')">next</a> child controls.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.draw" id=link11 onMouseOver="ShowTip(event, 'tt8', 'link11')" onMouseOut="HideTip('tt8')">draw</a></td><td class=SDescription>Called when the control is added to the map.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.previousTrigger" id=link12 onMouseOver="ShowTip(event, 'tt9', 'link12')" onMouseOut="HideTip('tt9')">previousTrigger</a></td><td class=SDescription>Restore the previous state. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.nextTrigger" id=link13 onMouseOver="ShowTip(event, 'tt10', 'link13')" onMouseOut="HideTip('tt10')">nextTrigger</a></td><td class=SDescription>Restore the next state. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.clear" id=link14 onMouseOver="ShowTip(event, 'tt11', 'link14')" onMouseOut="HideTip('tt11')">clear</a></td><td class=SDescription>Clear history.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.getState" id=link15 onMouseOver="ShowTip(event, 'tt12', 'link15')" onMouseOut="HideTip('tt12')">getState</a></td><td class=SDescription>Get the current state and return it.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.restore" id=link16 onMouseOver="ShowTip(event, 'tt13', 'link16')" onMouseOut="HideTip('tt13')">restore</a></td><td class=SDescription>Update the state with the given object.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.setListeners" id=link17 onMouseOver="ShowTip(event, 'tt14', 'link17')" onMouseOut="HideTip('tt14')">setListeners</a></td><td class=SDescription>Sets functions to be registered in the listeners object.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.activate" id=link18 onMouseOver="ShowTip(event, 'tt15', 'link18')" onMouseOut="HideTip('tt15')">activate</a></td><td class=SDescription>Activate the control. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.initStack" id=link19 onMouseOver="ShowTip(event, 'tt16', 'link19')" onMouseOut="HideTip('tt16')">initStack</a></td><td class=SDescription>Called after the control is activated if the previous history stack is empty.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.deactivate" id=link20 onMouseOver="ShowTip(event, 'tt17', 'link20')" onMouseOut="HideTip('tt17')">deactivate</a></td><td class=SDescription>Deactivate the control. </td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>
<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.Properties"></a>Properties</h3></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.type"></a>type</h3><div class=CBody><p>{String} Note that this control is not intended to be added directly to a control panel. Instead, add the sub-controls previous and next. These sub-controls are button type controls that activate and deactivate themselves. If this parent control is added to a panel, it will act as a toggle.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.previous"></a>previous</h3><div class=CBody><p>{<a href="../Control-js.html#OpenLayers.Control" class=LClass id=link26 onMouseOver="ShowTip(event, 'tt1', 'link26')" onMouseOut="HideTip('tt1')">OpenLayers.Control</a>} A button type control whose trigger method restores the previous state managed by this control.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.previousOptions"></a>previousOptions</h3><div class=CBody><p>{Object} Set this property on the options argument of the constructor to set optional properties on the <a href="#OpenLayers.Control.NavigationHistory.previous" class=LProperty id=link27 onMouseOver="ShowTip(event, 'tt2', 'link27')" onMouseOut="HideTip('tt2')">previous</a> control.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.next"></a>next</h3><div class=CBody><p>{<a href="../Control-js.html#OpenLayers.Control" class=LClass id=link28 onMouseOver="ShowTip(event, 'tt1', 'link28')" onMouseOut="HideTip('tt1')">OpenLayers.Control</a>} A button type control whose trigger method restores the next state managed by this control.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.nextOptions"></a>nextOptions</h3><div class=CBody><p>{Object} Set this property on the options argument of the constructor to set optional properties on the <a href="#OpenLayers.Control.NavigationHistory.next" class=LProperty id=link29 onMouseOver="ShowTip(event, 'tt3', 'link29')" onMouseOut="HideTip('tt3')">next</a> control.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.limit"></a>limit</h3><div class=CBody><p>{Integer} Optional limit on the number of history items to retain. If null, there is no limit. Default is 50.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.autoActivate"></a>autoActivate</h3><div class=CBody><p>{Boolean} Activate the control when it is added to a map. Default is true.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.clearOnDeactivate"></a>clearOnDeactivate</h3><div class=CBody><p>{Boolean} Clear the history when the control is deactivated. Default is false.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.registry"></a>registry</h3><div class=CBody><p>{Object} An object with keys corresponding to event types. Values are functions that return an object representing the current state.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.nextStack"></a>nextStack</h3><div class=CBody><p>{Array} Array of items in the history.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.previousStack"></a>previousStack</h3><div class=CBody><p>{Array} List of items in the history. First item represents the current state.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.listeners"></a>listeners</h3><div class=CBody><p>{Object} An object containing properties corresponding to event types. This object is used to configure the control and is modified on construction.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.restoring"></a>restoring</h3><div class=CBody><p>{Boolean} Currently restoring a history state. This is set to true before calling restore and set to false after restore returns.</p></div></div></div>
<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.Constructor"></a>Constructor</h3></div></div>
<div class="CConstructor"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.OpenLayers.Control.NavigationHistory"></a>OpenLayers.<wbr>Control.<wbr>NavigationHistory</h3><div class=CBody><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>options</td><td class=CDLDescription>{Object} An optional object whose properties will be used to extend the control.</td></tr></table></div></div></div>
<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.Functions"></a>Functions</h3></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.onPreviousChange"></a>onPreviousChange</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>onPreviousChange: function(</td><td class="PParameter prettyprint " nowrap>state,</td></tr><tr><td></td><td class="PParameter prettyprint " nowrap>length</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Called when the previous history stack changes.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>state</td><td class=CDLDescription>{Object} An object representing the state to be restored if previous is triggered again or null if no previous states remain.</td></tr><tr><td class=CDLEntry>length</td><td class=CDLDescription>{Integer} The number of remaining previous states that can be restored.</td></tr></table></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.onNextChange"></a>onNextChange</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>onNextChange: function(</td><td class="PParameter prettyprint " nowrap>state,</td></tr><tr><td></td><td class="PParameter prettyprint " nowrap>length</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Called when the next history stack changes.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>state</td><td class=CDLDescription>{Object} An object representing the state to be restored if next is triggered again or null if no next states remain.</td></tr><tr><td class=CDLEntry>length</td><td class=CDLDescription>{Integer} The number of remaining next states that can be restored.</td></tr></table></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.destroy"></a>destroy</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">destroy: function()</td></tr></table></blockquote><p>Destroy the control.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.setMap"></a>setMap</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>setMap: function(</td><td class="PParameter prettyprint " nowrap>map</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Set the map property for the control and <a href="#OpenLayers.Control.NavigationHistory.previous" class=LProperty id=link30 onMouseOver="ShowTip(event, 'tt2', 'link30')" onMouseOut="HideTip('tt2')">previous</a> and <a href="#OpenLayers.Control.NavigationHistory.next" class=LProperty id=link31 onMouseOver="ShowTip(event, 'tt3', 'link31')" onMouseOut="HideTip('tt3')">next</a> child controls.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>map</td><td class=CDLDescription>{<a href="../Map-js.html#OpenLayers.Map" class=LClass id=link32 onMouseOver="ShowTip(event, 'tt18', 'link32')" onMouseOut="HideTip('tt18')">OpenLayers.Map</a>}</td></tr></table></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.draw"></a>draw</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">draw: function()</td></tr></table></blockquote><p>Called when the control is added to the map.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.previousTrigger"></a>previousTrigger</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">previousTrigger: function()</td></tr></table></blockquote><p>Restore the previous state. If no items are in the previous history stack, this has no effect.</p><h4 class=CHeading>Returns</h4><p>{Object} Item representing state that was restored. Undefined if no items are in the previous history stack.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.nextTrigger"></a>nextTrigger</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">nextTrigger: function()</td></tr></table></blockquote><p>Restore the next state. If no items are in the next history stack, this has no effect. The next history stack is populated as states are restored from the previous history stack.</p><h4 class=CHeading>Returns</h4><p>{Object} Item representing state that was restored. Undefined if no items are in the next history stack.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.clear"></a>clear</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">clear: function()</td></tr></table></blockquote><p>Clear history.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.getState"></a>getState</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getState: function()</td></tr></table></blockquote><p>Get the current state and return it.</p><h4 class=CHeading>Returns</h4><p>{Object} An object representing the current state.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.restore"></a>restore</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>restore: function(</td><td class="PParameter prettyprint " nowrap>state</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Update the state with the given object.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>state</td><td class=CDLDescription>{Object} An object representing the state to restore.</td></tr></table></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.setListeners"></a>setListeners</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">setListeners: function()</td></tr></table></blockquote><p>Sets functions to be registered in the listeners object.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.activate"></a>activate</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">activate: function()</td></tr></table></blockquote><p>Activate the control. This registers any listeners.</p><h4 class=CHeading>Returns</h4><p>{Boolean} Control successfully activated.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.initStack"></a>initStack</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">initStack: function()</td></tr></table></blockquote><p>Called after the control is activated if the previous history stack is empty.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.deactivate"></a>deactivate</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">deactivate: function()</td></tr></table></blockquote><p>Deactivate the control. This unregisters any listeners.</p><h4 class=CHeading>Returns</h4><p>{Boolean} Control successfully deactivated.</p></div></div></div>
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<div class=CToolTip id="tt1"><div class=CClass>Controls affect the display or behavior of the map. </div></div><div class=CToolTip id="tt2"><div class=CProperty>{OpenLayers.Control} A button type control whose trigger method restores the previous state managed by this control.</div></div><div class=CToolTip id="tt3"><div class=CProperty>{OpenLayers.Control} A button type control whose trigger method restores the next state managed by this control.</div></div><div class=CToolTip id="tt4"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>onPreviousChange: function(</td><td class="PParameter prettyprint " nowrap>state,</td></tr><tr><td></td><td class="PParameter prettyprint " nowrap>length</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Called when the previous history stack changes.</div></div><div class=CToolTip id="tt5"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>onNextChange: function(</td><td class="PParameter prettyprint " nowrap>state,</td></tr><tr><td></td><td class="PParameter prettyprint " nowrap>length</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Called when the next history stack changes.</div></div><div class=CToolTip id="tt6"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">destroy: function()</td></tr></table></blockquote>Destroy the control.</div></div><div class=CToolTip id="tt7"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>setMap: function(</td><td class="PParameter prettyprint " nowrap>map</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Set the map property for the control and previous and next child controls.</div></div><div class=CToolTip id="tt8"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">draw: function()</td></tr></table></blockquote>Called when the control is added to the map.</div></div><div class=CToolTip id="tt9"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">previousTrigger: function()</td></tr></table></blockquote>Restore the previous state. </div></div><div class=CToolTip id="tt10"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">nextTrigger: function()</td></tr></table></blockquote>Restore the next state. </div></div><div class=CToolTip id="tt11"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">clear: function()</td></tr></table></blockquote>Clear history.</div></div><div class=CToolTip id="tt12"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getState: function()</td></tr></table></blockquote>Get the current state and return it.</div></div><div class=CToolTip id="tt13"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>restore: function(</td><td class="PParameter prettyprint " nowrap>state</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Update the state with the given object.</div></div><div class=CToolTip id="tt14"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">setListeners: function()</td></tr></table></blockquote>Sets functions to be registered in the listeners object.</div></div><div class=CToolTip id="tt15"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">activate: function()</td></tr></table></blockquote>Activate the control. </div></div><div class=CToolTip id="tt16"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">initStack: function()</td></tr></table></blockquote>Called after the control is activated if the previous history stack is empty.</div></div><div class=CToolTip id="tt17"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">deactivate: function()</td></tr></table></blockquote>Deactivate the 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