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<!DOCTYPE html> <html> <head> <title>compare.js</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <link rel="stylesheet" media="all" href="docco.css" /> </head> <body> <div id="container"> <div id="background"></div> <div id="jump_to"> Jump To … <div id="jump_wrapper"> <div id="jump_page"> <a class="source" href="jquerypp.html"> jquerypp.js </a> <a class="source" href="animate.html"> animate.js </a> <a class="source" href="compare.html"> compare.js </a> <a class="source" href="cookie.html"> cookie.js </a> <a class="source" href="dimensions.html"> dimensions.js </a> <a class="source" href="form_params.html"> form_params.js </a> <a class="source" href="range.html"> range.js </a> <a class="source" href="selection.html"> selection.js </a> <a class="source" href="styles.html"> styles.js </a> <a class="source" href="within.html"> within.js </a> <a class="source" href="default.html"> default.js </a> <a class="source" href="destroyed.html"> destroyed.js </a> <a class="source" href="drag.html"> drag.js </a> <a class="source" href="core.html"> core.js </a> <a class="source" href="limit.html"> limit.js </a> <a class="source" href="scroll.html"> scroll.js </a> <a class="source" href="step.html"> step.js </a> <a class="source" href="drop.html"> drop.js </a> <a class="source" href="fastfix.html"> fastfix.js </a> <a class="source" href="hover.html"> hover.js </a> <a class="source" href="key.html"> key.js </a> <a class="source" href="livehack.html"> livehack.js </a> <a class="source" href="pause.html"> pause.js </a> <a class="source" href="resize.html"> resize.js </a> <a class="source" href="reverse.html"> reverse.js </a> <a class="source" href="swipe.html"> swipe.js </a> <a class="source" href="json.html"> json.js </a> <a class="source" href="vector.html"> vector.js </a> </div> </div> </div> <table cellpadding="0" cellspacing="0"> <thead> <tr> <th class="docs"> <h1> compare.js </h1> </th> <th class="code"> </th> </tr> </thead> <tbody> <tr id="section-1"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-1">¶</a> </div> </td> <td class="code"> <div class="highlight"><pre><span class="p">(</span><span class="kd">function</span> <span class="p">(</span><span class="nx">$</span><span class="p">)</span> <span class="p">{</span></pre></div> </td> </tr> <tr id="section-2"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-2">¶</a> </div> <p>See http://ejohn.org/blog/comparing-document-position/</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nx">$</span><span class="p">.</span><span class="nx">fn</span><span class="p">.</span><span class="nx">compare</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">element</span><span class="p">)</span> <span class="p">{</span> <span class="c1">//usually</span>
<span class="k">try</span> <span class="p">{</span></pre></div> </td> </tr> <tr id="section-3"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-3">¶</a> </div> <p>Firefox 3 throws an error with XUL - we can't use compare then</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nx">element</span> <span class="o">=</span> <span class="nx">element</span><span class="p">.</span><span class="nx">jquery</span> <span class="o">?</span> <span class="nx">element</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">:</span> <span class="nx">element</span><span class="p">;</span>
<span class="p">}</span> <span class="k">catch</span> <span class="p">(</span><span class="nx">e</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="kc">null</span><span class="p">;</span>
<span class="p">}</span></pre></div> </td> </tr> <tr id="section-4"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-4">¶</a> </div> <p>make sure we aren't coming from XUL element</p> </td> <td class="code"> <div class="highlight"><pre> <span class="k">if</span> <span class="p">(</span><span class="nb">window</span><span class="p">.</span><span class="nx">HTMLElement</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">s</span> <span class="o">=</span> <span class="nx">HTMLElement</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">toString</span><span class="p">.</span><span class="nx">call</span><span class="p">(</span><span class="nx">element</span><span class="p">)</span>
<span class="k">if</span> <span class="p">(</span><span class="nx">s</span> <span class="o">==</span> <span class="s1">'[xpconnect wrapped native prototype]'</span> <span class="o">||</span> <span class="nx">s</span> <span class="o">==</span> <span class="s1">'[object XULElement]'</span> <span class="o">||</span> <span class="nx">s</span> <span class="o">===</span> <span class="s1">'[object Window]'</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="kc">null</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="k">this</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="nx">compareDocumentPosition</span><span class="p">)</span> <span class="p">{</span></pre></div> </td> </tr> <tr id="section-5"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-5">¶</a> </div> <p>For browsers that support it, use compareDocumentPosition
https://developer.mozilla.org/en/DOM/Node.compareDocumentPosition</p> </td> <td class="code"> <div class="highlight"><pre> <span class="k">return</span> <span class="k">this</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="nx">compareDocumentPosition</span><span class="p">(</span><span class="nx">element</span><span class="p">);</span>
<span class="p">}</span></pre></div> </td> </tr> <tr id="section-6"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-6">¶</a> </div> <p>this[0] contains element</p> </td> <td class="code"> <div class="highlight"><pre> <span class="k">if</span> <span class="p">(</span><span class="k">this</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">==</span> <span class="nb">document</span> <span class="o">&&</span> <span class="nx">element</span> <span class="o">!=</span> <span class="nb">document</span><span class="p">)</span> <span class="k">return</span> <span class="mi">8</span><span class="p">;</span>
<span class="kd">var</span> <span class="nx">number</span> <span class="o">=</span></pre></div> </td> </tr> <tr id="section-7"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-7">¶</a> </div> <p>this[0] contains element</p> </td> <td class="code"> <div class="highlight"><pre> <span class="p">(</span><span class="k">this</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">!==</span> <span class="nx">element</span> <span class="o">&&</span> <span class="k">this</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="nx">contains</span><span class="p">(</span><span class="nx">element</span><span class="p">)</span> <span class="o">&&</span> <span class="mi">16</span><span class="p">)</span> <span class="o">+</span></pre></div> </td> </tr> <tr id="section-8"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-8">¶</a> </div> <p>element contains this[0]</p> </td> <td class="code"> <div class="highlight"><pre> <span class="p">(</span><span class="k">this</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">!=</span> <span class="nx">element</span> <span class="o">&&</span> <span class="nx">element</span><span class="p">.</span><span class="nx">contains</span><span class="p">(</span><span class="k">this</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span> <span class="o">&&</span> <span class="mi">8</span><span class="p">),</span>
<span class="nx">docEl</span> <span class="o">=</span> <span class="nb">document</span><span class="p">.</span><span class="nx">documentElement</span><span class="p">;</span></pre></div> </td> </tr> <tr id="section-9"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-9">¶</a> </div> <p>Use the sourceIndex</p> </td> <td class="code"> <div class="highlight"><pre> <span class="k">if</span> <span class="p">(</span><span class="k">this</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="nx">sourceIndex</span><span class="p">)</span> <span class="p">{</span></pre></div> </td> </tr> <tr id="section-10"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-10">¶</a> </div> <p>this[0] precedes element</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nx">number</span> <span class="o">+=</span> <span class="p">(</span><span class="k">this</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="nx">sourceIndex</span> <span class="o"><</span> <span class="nx">element</span><span class="p">.</span><span class="nx">sourceIndex</span> <span class="o">&&</span> <span class="mi">4</span><span class="p">)</span></pre></div> </td> </tr> <tr id="section-11"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-11">¶</a> </div> <p>element precedes foo[0]</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nx">number</span> <span class="o">+=</span> <span class="p">(</span><span class="k">this</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="nx">sourceIndex</span> <span class="o">></span> <span class="nx">element</span><span class="p">.</span><span class="nx">sourceIndex</span> <span class="o">&&</span> <span class="mi">2</span><span class="p">)</span></pre></div> </td> </tr> <tr id="section-12"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-12">¶</a> </div> <p>The nodes are in different documents</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nx">number</span> <span class="o">+=</span> <span class="p">(</span><span class="k">this</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="nx">ownerDocument</span> <span class="o">!==</span> <span class="nx">element</span><span class="p">.</span><span class="nx">ownerDocument</span> <span class="o">||</span> <span class="p">(</span><span class="k">this</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">!=</span> <span class="nx">docEl</span> <span class="o">&&</span> <span class="k">this</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="nx">sourceIndex</span> <span class="o"><=</span> <span class="mi">0</span><span class="p">)</span> <span class="o">||</span> <span class="p">(</span><span class="nx">element</span> <span class="o">!=</span> <span class="nx">docEl</span> <span class="o">&&</span> <span class="nx">element</span><span class="p">.</span><span class="nx">sourceIndex</span> <span class="o"><=</span> <span class="mi">0</span><span class="p">))</span> <span class="o">&&</span> <span class="mi">1</span>
<span class="p">}</span>
<span class="k">return</span> <span class="nx">number</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="nx">$</span><span class="p">;</span>
<span class="p">})(</span><span class="nx">jQuery</span><span class="p">);</span>
</pre></div> </td> </tr> </tbody> </table> </div> </body> </html>