Is the event window.onbeforeunload considered reliable?
Is cross-browser compatibility guaranteed?
Yes, the onbeforeunload event functions in all major browsers without any issues.
What happens if the client browser crashes?
Unfortunately, if a browser crashes, the event will not be triggered as the browser shuts down completely.
Can the event be delayed for additional processing time?
Although initial response was negative, there are exceptions. For instance, a lengthy loop will be allowed to complete before the page unloads. However, asynchronous functions like AJAX or setTimeout cannot be used within the event handler. It is crucial for the event to return a synchronous response to prevent unloading.
Are there any alternative approaches?
While initial stance was against alternatives, further explanation reveals an approach involving event handlers for link clicks triggering the onbeforeunload event to display custom confirmation boxes, preventing the link action if needed. This method is limited to link clicks and not applicable to browser navigation buttons. Although complex, it enables additional actions before loading a new page, including AJAX requests if user confirms navigation.
In conclusion, while some alternatives exist, they are rooted in the usage of the onbeforeunload event and can introduce complexity to the process.
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