Why does JavaScript only work after opening developer tools in IE once?
IE’s console object is inactive until the developer tools are opened. This may cause JavaScript incorporating console methods like console.log() to halt. To bypass this, confirm the existence of console with:
Alternatively, initialize a dummy console to completely evade errors:
These snippets safeguard JavaScript from being interrupted in IE when the developer tools are closed.
Remember IE's peculiar behavior
Internet Explorer, as any web developer knows, can be a bit... "unusual". A prime example is its console object management. Consequently, your JavaScript functions might only come to life after opening and closing the developer tools for the first time, which activates the console.
Addressing the caching beast in IE
One notorious trait of IE is its aggressive caching which can outright sabotage your JavaScript execution. In particular, IE has a taste for caching AJAX requests longer than deemed fit. Thankfully, you can put a leash on this by ensuring caching is set to false on your $.ajax calls or when executing XMLHttpRequests.
Upholding compatibility and consistency
Browser compatibility is not just a buzzword, it's real work. For your code to perform reliably across browsers, make sure it doesn't rely solely on developer tools to function. Reach out to tools like the HTML5 Boilerplate script to control console hiccups, or DIY by creating a console object if it does not exist in IE.
When you have to deal with older IE versions
For instances that are unique to older versions like IE9, you might have to come up with IE-specific solutions. Don’t sweat it though; HTML5 Boilerplate on GitHub has got your back with their latest console fix code. These can make even the grumpiest of IE versions cooperate without any developer tools.
Resolving issues like a pro
Look before you leap
Prevention is better than cure. Use proactive error checks, like the console check or dummy object creation mentioned above, to stop any tricks JavaScript might try to play.
Going undercover with debugging
When hunting down these glitches, use IE's developer tools in a way that’s smart, not hard. It's especially helpful to get past retrospective issues like caching. As a routine, clear the cache often or if you're feeling extra, manipulate your server headers to avert aggressive caching holidays.
Additional insights
Warning: Console references ahead!
Don't let console references in your production code stand in the way of your script execution. Replace or modify them to avoid any unnecessary surprises.
Polyfills: Your knight in shining armor
Don't hesitate to use polyfills when your code needs to bridge any browser-specific gaps. HTML5 Boilerplate offers a reliable console.log wrapper which enables safe logging in even the stickiest of browser situations.
Embrace the modern web
As we move forward, encourage the upgrading of browser versions and the adoption of practices which put the peculiarities of IE in the rear-view mirror. Opting for evergreen browsers not only standardizes the development experience but also paves the way for modern, reliable, and faster web technologies.
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