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Why Am I Getting a 'SecurityError: Blocked Cross-Origin Frame Access' in JavaScript?

Mary-Kate Olsen

Dec 27, 2024 am 05:51 AM

Why Am I Getting a

Security Error: Blocked Cross-Origin Frame Access

When attempting to access elements within an from a different origin using JavaScript, you may encounter the error:</p> <pre class="brush:php;toolbar:false">SecurityError: Blocked a frame with origin "http://www.example.com" from accessing a cross-origin frame.</pre> <p>This error is a result of the same-origin policy, a fundamental security measure browsers enforce.</p> <p><h3>Same-Origin Policy and Its Implications</h3></p> <p>The same-origin policy prevents scripts from accessing resources (such as other pages or frames) with a different origin. An origin is defined by the protocol (e.g., HTTP), hostname, and port of the URL. Any difference in any of these components constitutes a separate origin.</p> <p>For instance, a script from "http://www.example.com" cannot access resources from "https://www.example.com", "http://www.anothersite.com", or "http://www.example.com:81".</p> <p><h3>Accessing Cross-Origin Frames: A Workaround</h3></p> <p>While direct script access to cross-origin frames is blocked, there is a workaround using window.postMessage and event listeners. This approach allows you to exchange data between the main page and the frame:</p> <p><strong>Main Page:</strong></p> <pre class="brush:php;toolbar:false">const frame = document.getElementById('your-frame-id'); frame.contentWindow.postMessage(/*variable or object*/, 'https://your-second-site.example');</pre> <p><strong><iframe> Page:</strong></p> <pre class="brush:php;toolbar:false">window.addEventListener('message', event => { // Check the origin of the data if (event.origin === 'https://your-first-site.example') { // Data is from the main page, use event.data to process it } });</pre> <p>Remember that the same-origin policy is crucial for security. Disabling it in your browser for a specific site or globally should only be done for development purposes and with extreme caution.</p><p>The above is the detailed content of Why Am I Getting a 'SecurityError: Blocked Cross-Origin Frame Access' in JavaScript?. 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There are many ways to create Date objects. It is recommended to use ISO format strings to ensure compatibility; 2. Get and set time information can be obtained and set methods, and note that the month starts from 0; 3. Manually formatting dates requires strings, and third-party libraries can also be used; 4. It is recommended to use libraries that support time zones, such as Luxon. Mastering these key points can effectively avoid common mistakes.</p> </div> <div id="377j5v51b" class="phphistorical_Version2_mids"> <a href="http://m.miracleart.cn/faq/1796828200.html" title="Why should you place tags at the bottom of the ?" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/253/068/175139053194540.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="Why should you place tags at the bottom of the ?" /> </a> <a href="http://m.miracleart.cn/faq/1796828200.html" title="Why should you place tags at the bottom of the ?" class="phphistorical_Version2_mids_title">Why should you place tags at the bottom of the ?</a> <span id="377j5v51b" class="Articlelist_txts_time">Jul 02, 2025 am 01:22 AM</span> <p class="Articlelist_txts_p">PlacingtagsatthebottomofablogpostorwebpageservespracticalpurposesforSEO,userexperience,anddesign.1.IthelpswithSEObyallowingsearchenginestoaccesskeyword-relevanttagswithoutclutteringthemaincontent.2.Itimprovesuserexperiencebykeepingthefocusonthearticl</p> </div> <div id="377j5v51b" class="phphistorical_Version2_mids"> <a href="http://m.miracleart.cn/faq/1796822037.html" title="JavaScript vs. Java: A Comprehensive Comparison for Developers" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/253/068/175035006093854.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="JavaScript vs. Java: A Comprehensive Comparison for Developers" /> </a> <a href="http://m.miracleart.cn/faq/1796822037.html" title="JavaScript vs. Java: A Comprehensive Comparison for Developers" class="phphistorical_Version2_mids_title">JavaScript vs. Java: A Comprehensive Comparison for Developers</a> <span id="377j5v51b" class="Articlelist_txts_time">Jun 20, 2025 am 12:21 AM</span> <p class="Articlelist_txts_p">JavaScriptispreferredforwebdevelopment,whileJavaisbetterforlarge-scalebackendsystemsandAndroidapps.1)JavaScriptexcelsincreatinginteractivewebexperienceswithitsdynamicnatureandDOMmanipulation.2)Javaoffersstrongtypingandobject-orientedfeatures,idealfor</p> </div> <div id="377j5v51b" class="phphistorical_Version2_mids"> <a href="http://m.miracleart.cn/faq/1796822137.html" title="JavaScript: Exploring Data Types for Efficient Coding" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/253/068/175035157160537.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="JavaScript: Exploring Data Types for Efficient Coding" /> </a> <a href="http://m.miracleart.cn/faq/1796822137.html" title="JavaScript: Exploring Data Types for Efficient Coding" class="phphistorical_Version2_mids_title">JavaScript: Exploring Data Types for Efficient Coding</a> <span id="377j5v51b" class="Articlelist_txts_time">Jun 20, 2025 am 12:46 AM</span> <p class="Articlelist_txts_p">JavaScripthassevenfundamentaldatatypes:number,string,boolean,undefined,null,object,andsymbol.1)Numbersuseadouble-precisionformat,usefulforwidevaluerangesbutbecautiouswithfloating-pointarithmetic.2)Stringsareimmutable,useefficientconcatenationmethodsf</p> </div> <div id="377j5v51b" class="phphistorical_Version2_mids"> <a href="http://m.miracleart.cn/faq/1796828191.html" title="What is event bubbling and capturing in the DOM?" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/253/068/175139034116786.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="What is event bubbling and capturing in the DOM?" /> </a> <a href="http://m.miracleart.cn/faq/1796828191.html" title="What is event bubbling and capturing in the DOM?" class="phphistorical_Version2_mids_title">What is event bubbling and capturing in the DOM?</a> <span id="377j5v51b" class="Articlelist_txts_time">Jul 02, 2025 am 01:19 AM</span> <p class="Articlelist_txts_p">Event capture and bubble are two stages of event propagation in DOM. Capture is from the top layer to the target element, and bubble is from the target element to the top layer. 1. Event capture is implemented by setting the useCapture parameter of addEventListener to true; 2. Event bubble is the default behavior, useCapture is set to false or omitted; 3. Event propagation can be used to prevent event propagation; 4. Event bubbling supports event delegation to improve dynamic content processing efficiency; 5. Capture can be used to intercept events in advance, such as logging or error processing. Understanding these two phases helps to accurately control the timing and how JavaScript responds to user operations.</p> </div> <div id="377j5v51b" class="phphistorical_Version2_mids"> <a href="http://m.miracleart.cn/faq/1796820615.html" title="What's the Difference Between Java and JavaScript?" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/253/068/175012302052703.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="What's the Difference Between Java and JavaScript?" /> </a> <a href="http://m.miracleart.cn/faq/1796820615.html" title="What's the Difference Between Java and JavaScript?" class="phphistorical_Version2_mids_title">What's the Difference Between Java and JavaScript?</a> <span id="377j5v51b" class="Articlelist_txts_time">Jun 17, 2025 am 09:17 AM</span> <p class="Articlelist_txts_p">Java and JavaScript are different programming languages. 1.Java is a statically typed and compiled language, suitable for enterprise applications and large systems. 2. JavaScript is a dynamic type and interpreted language, mainly used for web interaction and front-end development.</p> </div> </div> <a href="http://m.miracleart.cn/web-designer.html" class="phpgenera_Details_mainL4_botton"> <span>See all articles</span> <img src="/static/imghw/down_right.png" alt="" /> </a> </div> </div> </div> </main> <footer> <div id="377j5v51b" class="footer"> <div id="377j5v51b" class="footertop"> <img src="/static/imghw/logo.png" alt=""> <p>Public welfare online PHP training，Help PHP learners grow quickly！</p> </div> <div id="377j5v51b" class="footermid"> <a href="http://m.miracleart.cn/about/us.html">About us</a> <a href="http://m.miracleart.cn/about/disclaimer.html">Disclaimer</a> <a href="http://m.miracleart.cn/update/article_0_1.html">Sitemap</a> </div> <div id="377j5v51b" class="footerbottom"> <p> ? php.cn All rights reserved </p> </div> </div> </footer> <input type="hidden" id="verifycode" value="/captcha.html"> <link rel='stylesheet' id='_main-css' href='/static/css/viewer.min.css?2' type='text/css' media='all' /> <footer> <div class="friendship-link"> <p>感谢您访问我们的网站，您可能还对以下资源感兴趣：</p> <a href="http://m.miracleart.cn/" title="国产av日韩一区二区三区精品">国产av日韩一区二区三区精品</a> <div class="friend-links"> </div> </div> </footer> <script> (function(){ var bp = document.createElement('script'); 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Why Am I Getting a 'SecurityError: Blocked Cross-Origin Frame Access' in JavaScript?

Security Error: Blocked Cross-Origin Frame Access