JavaScript Event Handler In ASP.NET June 11, 2022 Post a Comment I have the following iframe control (intended to be a facebook like button): <h2 id="solution_1">Solution 1: </h2> <div class="answer-desc"><p>asp.net events (like prerender) don't apply anywhere else (like javascript)</p> <p>assuming you are using jquery, I would wrap that in a $(), which is a shorthand for "Execute the following as soon as the page has loaded enough to start manipulating it". Also, asp.net controls have a different api then dom elements, so if you want to use that api you need to wrap it in a scriptlet tag</p> <pre><code id="code_0" class="hljs language-xml"><span class="hljs-tag"><<span class="hljs-name">script</span> <span class="hljs-attr">type</span>=<span class="hljs-string">"text/javascript"</span>></span><span class="language-javascript"> $(<span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) { <span class="hljs-keyword">var</span> iframe = $(<span class="hljs-string">"#likeButton"</span>); <span class="hljs-keyword">var</span> newSrc = iframe.<span class="hljs-title function_">attr</span>(<span class="hljs-string">"src"</span>); newSrc += <span class="hljs-built_in">encodeURIComponent</span>(location.<span class="hljs-property">href</span>) + <span class="hljs-string">"<%= lblKey.Text %>"</span>; iframe.<span class="hljs-title function_">attr</span>(<span class="hljs-string">"src"</span>, newSrc); }); </span><span class="hljs-tag"></<span class="hljs-name">script</span>></span> </code><button class="copy-btn btn btn-secondary btn-sm" onclick="copyCode(this,'code_0')">Copy</button></pre></div> <br> <h2 id="solution_2">Solution 2: </h2> <div class="answer-desc"><p>Have you considered using the onload event and passing a reference to the iframe?</p> <pre><code id="code_1" class="hljs language-xml"><span class="hljs-tag"><<span class="hljs-name">script</span> <span class="hljs-attr">type</span>=<span class="hljs-string">"text/javascript"</span>></span><span class="language-javascript"> <span class="hljs-keyword">function</span> <span class="hljs-title function_">change_source</span>(<span class="hljs-params">iframe</span>) { <span class="hljs-keyword">if</span> (iframe.<span class="hljs-property">src</span>.<span class="hljs-title function_">indexOf</span>(<span class="hljs-string">'facebook'</span>) < <span class="hljs-number">0</span>) { iframe.<span class="hljs-property">src</span> = <span class="hljs-string">'http://www.facebook.com/plugins/like.php?href=<%= lblKey.Text %>'</span>; } } </span><span class="hljs-tag"></<span class="hljs-name">script</span>></span> </code><button class="copy-btn btn btn-secondary btn-sm" onclick="copyCode(this,'code_1')">Copy</button></pre> <p>HTML something like this...</p> <pre><code id="code_2" class="hljs language-bash"><iframe <span class="hljs-built_in">id</span>=<span class="hljs-string">"likeButton"</span> src=<span class="hljs-string">"about:blank"</span> scrolling=<span class="hljs-string">"no"</span> frameborder=<span class="hljs-string">"0"</span> style=<span class="hljs-string">"border:none; overflow:hidden; width:450px; height:80px;"</span> onload=<span class="hljs-string">"change_source(this);"</span> </iframe> </code><button class="copy-btn btn btn-secondary btn-sm" onclick="copyCode(this,'code_2')">Copy</button></pre></div> <br> </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/-/Asp.net 2.0?alt=json-in-script&callback=bacaJuga&max-results=5'></script> <script src='/feeds/posts/summary/-/Facebook?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 src='/feeds/posts/summary/-/Jquery?alt=json-in-script&callback=bacaJuga&max-results=5'></script> <script> showBacaJuga("https://dealsforwhiskytasting.blogspot.com/2022/06/javascript-event-handler-in-aspnet.html"); 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