Instanceof Fails In Iframe January 29, 2024 Post a Comment The following code returns true. Doing the same in an context returns false: let iframe = document.querySelector('iframe'); iframe = iframe.contentDocument || ifra</div><h2 id="solution_1">Solution 1: </h2><div class="answer-desc"><p>This is because:</p><p>1) <code>Element</code> is actually <code>window.Element</code></p><p>2) In JS there is no such thing as a "class". Everything (almost) is an object. So instanceof checks for <em>Prototype ancestry</em>. When you ask <code>is some DOM node instanceof Element</code> you could kind of translate this to <code>someDOMNode.prototype === Element</code>.</p><a name="more"></a><p>3) <code>window.Element !== document.querySelector('iframe').contentWindow.Element</code> !!!</p><p>This will log <code>true</code> as expected:</p><pre><code id="code_6" class="hljs language-javascript"><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(iframe.<span class="hljs-title function_">createElement</span>(<span class="hljs-string">'script'</span>) <span class="hljs-keyword">instanceof</span><span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'iframe'</span>).<span class="hljs-property">contentWindow</span>.<span class="hljs-property">Element</span>); </code><button class="copy-btn btn btn-secondary btn-sm" onclick="copyCode(this,'code_6')">Copy</button></pre></div> </div> <div id='baca-juga'></div> <script> //<![CDATA[ var bacaJugaJudul=[],bacaJugaNum=0,bacaJugaUrl=[];function bacaJuga(a){for(var u=0;u<a.feed.entry.length;u++){var e=a.feed.entry[u];bacaJugaJudul[bacaJugaNum]=e.title.$t;for(var l=0;l<e.link.length;l++)if("alternate"==e.link[l].rel){bacaJugaUrl[bacaJugaNum]=e.link[l].href,bacaJugaNum++;break}}}function showBacaJuga(a){function u(a,u){u.parentNode.insertBefore(a,u.nextSibling)}var e=document.querySelector("#baca-juga"),l=document.createElement("div"),t=document.querySelector(".post-body-artikel").querySelectorAll("div > br, span > br, div > p, span > p"),r=Math.ceil(.5*t.length),n=document.getElementById("related"),c=(l.setAttribute("class","baca-juga-wrap"),{bacaJuga:!0,jumlahBacaJuga:3,judulBacaJuga:"Baca Juga"});optionLinkMagz(c);if(!0===c.bacaJuga&&void 0!==t[r]){u(e,null!==n?n:t[r]);for(var g=0;g<bacaJugaUrl.length;g++)bacaJugaUrl[g]==a&&(bacaJugaUrl.splice(g,1),bacaJugaJudul.splice(g,1));var J=Math.floor((bacaJugaJudul.length-1)*Math.random()),g=0;if(0<bacaJugaJudul.length&&0<c.jumlahBacaJuga){e.appendChild(l);n=e;null!=(n=n.previousElementSibling)&&"BR"===n.tagName&&(n.style.display="none");for(var i="<strong>"+c.judulBacaJuga+"</strong><ul>";g<bacaJugaJudul.length&&g<c.jumlahBacaJuga;g++)i+='<li><a href="'+bacaJugaUrl[J]+'">'+bacaJugaJudul[J]+"</a></li>",J<bacaJugaJudul.length-1?J++:J=0;l.innerHTML=i+="</ul>"}}} //]]> </script> <script src='/feeds/posts/summary/-/Iframe?alt=json-in-script&callback=bacaJuga&max-results=5'></script> <script src='/feeds/posts/summary/-/Instanceof?alt=json-in-script&callback=bacaJuga&max-results=5'></script> <script src='/feeds/posts/summary/-/Javascript?alt=json-in-script&callback=bacaJuga&max-results=5'></script> <script> showBacaJuga("https://griddle-reviews.blogspot.com/2024/01/instanceof-fails-in-iframe.html"); 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