7/21/2023 0 Comments Iframe onload![]() Here is another example in which we display a button to tweet your web page on Twitter: You may have crossed paths with it when you had to include a third-party widget (like the famous Facebook like button), a YouTube video, or an advertising section on your website.įor instance, the code below will display a 500px square with the google homepage within: What is an iframe, and when do you use it?ĭevelopers mainly use the iframe tag to embed another HTML document within the current one. Finally, we’ll talk about how you can secure your iframe to avoid potential vulnerabilities. We’ll go through most of the features the iframe element provides and talk about how you use them, as well as how iframe can be useful for overcoming some tricky situations. To help you form your own opinion and sharpen your developer skills, we will cover all the essentials you should know about this controversial tag. They have many legitimate uses cases.īesides, it’s not that hard to secure them, so you won’t have to worry about your user’s computer becoming infected. I believe that their bad reputation should not prevent you from relying on them. The iframe element (short for inline frame) is probably among the oldest HTML tags and was introduced in 1997 with HTML 4.01 by Microsoft Internet Explorer.Įven though all modern browsers support them, many developers write endless articles advising against using them. ![]() Nada also dabbles in digital marketing, dance, and Chinese. She specializes in Vue.js and loves sharing anything and everything that could help her fellow frontend web developers. the images in the page are loaded or not, it might not be enough as images are loaded async as well.Nada Rifki Follow Nada is a JavaScript developer who likes to play with UI components to create interfaces with great UX. This approach works well with RWA pages with lists to understand if e.g. This is how the app understands that the content of the iframe is fully loaded and ready for the subsequent work. In the other screen with the iframe, after I assign the URL of the page-to-be-printed to the src of the iframe, I check if the same message ('iframe-loaded') is received or not if received, I send the content of the iframe to print dialog: This is to understand if loading of the page is finished so there is a counterpart "window.onmessage" in the other screen where this page-to-be-printed is loaded into an iframe, to catch this message. I check whether the last item of the list is loaded or not, with the following container:Īnd in the ComponentDidMount handler, I post a message like this: In my case, the RWA page that needs to be fully loaded consists only of a list with many items. So I resorted on the "componentDidMount" JS event approach. This approach doesn't work good with RWA pages as they work with async calls (and the real "render finish" of it is not detectable by the iframe.onload event). When the page is fully loaded (by checking with the JS onload function as suggested above), I would transfer the content of the iframe to the print dialog. Normally, I would render the page to be printed in a hidden iframe (that is located in the screen where the print dialog will be opened). My scenario is actually that I need to send the content of a RWA page to the print dialog. For future reference, I would like to share what I did to solve this issue.
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