IE11 fires "input" event on textarea if a placeholder is set

[oberhamsi]

Version

2.5.8

Reproduction link

https://jsfiddle.net/50wL7mdz/79205/

Steps to reproduce

Opening the page in IE11 will display the message "Foo is no longer null".

In modern FF, Chrome and Edge the message does not show up and foo remains null until the user actually inputs something.

IE11 does not fire an input event if no placeholder is set as show with the second textarea.

What is expected?

No input event should fire and thus foo should remain null

What is actually happening?

IE fires an input event if the textarea has a placeholder

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There was a similar issue in angular angular/angular.js#2614

[posva]

Unfortunately, this is an IE bug (https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/101220/). IE shouldn't fire an input event

I thought we already closed an issue with this but I couldn't find it, must be my imagination 😄

[oberhamsi]

Found this on the old bug tracker and last comment from MS: no fix

https://connect.microsoft.com/IE/feedback/details/856700/ie11-ie10-send-input-events-at-times-when-it-is-not-appropriate

[yyx990803]

Note: I assume you want to preserve the null state to determine whether an input field is dirty or not. The patch above only fixes the initial rendering - subsequent change to placeholder (if a dynamic binding is used) will still trigger input events in IE, and it happens to <input> tags as well. That we consider a wontfix as it involves significantly more complex workarounds for marginal benefits.

[oberhamsi]

thanks!