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3 <html><head><title>OpenLayers.Control.NavigationHistory - OpenLayers</title><link rel="stylesheet" type="text/css" href="../../../styles/main.css"><script language=JavaScript src="../../../javascript/main.js"></script><script language=JavaScript src="../../../javascript/searchdata.js"></script></head><body class="ContentPage" onLoad="NDOnLoad()"><script language=JavaScript><!--
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14 <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=link10 onMouseOver="ShowTip(event, 'tt2', 'link10')" onMouseOut="HideTip('tt2')">previous</a> and <a href="#OpenLayers.Control.NavigationHistory.next" class=LProperty id=link11 onMouseOver="ShowTip(event, 'tt3', 'link11')" onMouseOut="HideTip('tt3')">next</a>. Call the trigger method on the <a href="#OpenLayers.Control.NavigationHistory.previous" class=LProperty id=link12 onMouseOver="ShowTip(event, 'tt2', 'link12')" onMouseOut="HideTip('tt2')">previous</a> and <a href="#OpenLayers.Control.NavigationHistory.next" class=LProperty id=link13 onMouseOver="ShowTip(event, 'tt3', 'link13')" 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=link14 onMouseOver="ShowTip(event, 'tt1', 'link14')" 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.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"><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 SMarked"><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"><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 SMarked"><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="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.destroy" id=link5 onMouseOver="ShowTip(event, 'tt4', 'link5')" onMouseOut="HideTip('tt4')">destroy</a></td><td class=SDescription>Destroy the control.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.nextTrigger" id=link6 onMouseOver="ShowTip(event, 'tt5', 'link6')" onMouseOut="HideTip('tt5')">nextTrigger</a></td><td class=SDescription>Restore the next state. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.clear" id=link7 onMouseOver="ShowTip(event, 'tt6', 'link7')" onMouseOut="HideTip('tt6')">clear</a></td><td class=SDescription>Clear history.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.activate" id=link8 onMouseOver="ShowTip(event, 'tt7', 'link8')" onMouseOut="HideTip('tt7')">activate</a></td><td class=SDescription>Activate the control. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Control.NavigationHistory.deactivate" id=link9 onMouseOver="ShowTip(event, 'tt8', 'link9')" onMouseOut="HideTip('tt8')">deactivate</a></td><td class=SDescription>Deactivate the control. </td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>
16 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.Properties"></a>Properties</h3></div></div>
18 <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=link15 onMouseOver="ShowTip(event, 'tt1', 'link15')" 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>
20 <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=link16 onMouseOver="ShowTip(event, 'tt2', 'link16')" onMouseOut="HideTip('tt2')">previous</a> control.</p></div></div></div>
22 <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=link17 onMouseOver="ShowTip(event, 'tt1', 'link17')" 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>
24 <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=link18 onMouseOver="ShowTip(event, 'tt3', 'link18')" onMouseOut="HideTip('tt3')">next</a> control.</p></div></div></div>
26 <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>
28 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.Constructor"></a>Constructor</h3></div></div>
30 <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>
32 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Control.NavigationHistory.Functions"></a>Functions</h3></div></div>
34 <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>destroy: function()</td></tr></table></blockquote><p>Destroy the control.</p></div></div></div>
36 <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>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>
38 <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>clear: function()</td></tr></table></blockquote><p>Clear history.</p></div></div></div>
40 <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>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>
42 <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>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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57 <!--START_ND_TOOLTIPS-->
58 <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>destroy: function()</td></tr></table></blockquote>Destroy the control.</div></div><div class=CToolTip id="tt5"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>nextTrigger: function()</td></tr></table></blockquote>Restore the next state. </div></div><div class=CToolTip id="tt6"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>clear: function()</td></tr></table></blockquote>Clear history.</div></div><div class=CToolTip id="tt7"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>activate: function()</td></tr></table></blockquote>Activate the control. </div></div><div class=CToolTip id="tt8"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>deactivate: function()</td></tr></table></blockquote>Deactivate the control. </div></div><!--END_ND_TOOLTIPS-->
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