![]() ![]() Browser sends authorization information and cookies to remote server. crossorigin="use-credentials" – access allowed if the server sends back the header Access-Control-Allow-Origin with our origin and Access-Control-Allow-Credentials: true.Browser does not send authorization information and cookies to remote server. crossorigin="anonymous" – access allowed if the server responds with the header Access-Control-Allow-Origin with * or our origin.No crossorigin attribute – access prohibited.There are three levels of cross-origin access: To allow cross-origin access, the tag needs to have the crossorigin attribute, plus the remote server must provide special headers. Then, in the parent window you attach a handler to react to that event. Similar cross-origin policy (CORS) is enforced for other types of resources as well. The iframe fires an event on the (potentially existing) parent window's document - please beware that the parent document needs a jQuery instance of itself for this to work. But if a script comes from another origin, then there’s not much information about errors in it, as we’ve just seen. That’s great, as we can see real errors, triggered by our users. There are many services (and we can build our own) that listen for global errors using window.onerror, save errors and provide an interface to access and analyze them. Exactly because it’s from another domain. If we’re using a script from another domain, and there’s an error in it, we can’t get error details.įor example, let’s take a script error.js that consists of a single (bad) function call:ĭetails may vary depending on the browser, but the idea is the same: any information about the internals of a script, including error stack traces, is hidden. This rule also affects resources from other domains. So even if we have a subdomain, or just another port, these are different origins with no access to each other. ![]() Or, to be more precise, one origin (domain/port/protocol triplet) can’t access the content from another one. a script at can’t read the user’s mailbox at. There’s a rule: scripts from one site can’t access contents of the other site. For, the iframe.onload event triggers when the iframe loading finished, both for successful load and in case of an error.It starts loading when it gets a src (*). Most resources start loading when they are added to the document.If it's not, simply attach the event trigger line to the window's load event like so: $(window).Alert(`Image loaded, size $`) Īlert("Error occurred while loading image") Please note, that we're leveraging the DOM ready event to fire the event - which should be suitable for most use cases. More generally speaking, it shouldn't be the concern of the iframe to know its surrounding environment. This solution has the advantage of not breaking when the containing page does not contain the expected load handler. The iframe fires an event on the (potentially existing) parent window's document - please beware that the parent document needs a jQuery instance of itself for this to work. $(document).on('iframeready', myHandler) W.parent.jQuery(w.parent.document).trigger('iframeready') Along the lines of Tim Down's answer but leveraging jQuery (mentioned by the OP) and loosely coupling the containing page and the iframe, you could do the following: ![]()
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