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Allow setting defaultValue as a property for #4618 #5666

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@hayesgm hayesgm commented Dec 15, 2015

Fixes issue #4618, which allows updates to defaultValue on uncontrolled <input>s. Browsers will reflect changes to defaultValue unless the user has changed the input value. This patch also allows updates to defaultValue on a controlled element with value == null.

@spicyj suggested using setAttribute('value'), but instead this patch sets the defaultValue property as a property. The goal is to keep behavior as consistent with current day as possible.

If we like this approach, we should consider bringing it to <textarea> and <select>, as well.

Here's a simple test of the patch on JSBin: https://jsbin.com/yagasi/edit?js,output

checked: checked != null ? checked : inst._wrapperState.initialChecked,
onChange: inst._wrapperState.onChange,
});

if (value !== undefined) {
// for contolled inputs, use defaultValue as an initial value
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cont_r_olled

@hayesgm
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hayesgm commented Dec 16, 2015

@yaycmyk Thanks, fixed.

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@hayesgm updated the pull request.

@hayesgm
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hayesgm commented Dec 16, 2015

I built an alternate approach and opened a pull request via #5680. Both are functional and it's a matter of style to pick between these two.

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This requires fewer changes but #5680 is closer to where I'd like to end up since we're moving away from properties and towards attributes in most cases (e.g., see #1510). Plus with #5680 it looks like we may be able to kill "hasSideEffects" since that logic will be inlined into the form components that need it and no other properties do.

So let's go with that one.

@sophiebits sophiebits closed this Dec 16, 2015
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