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Set the correct initial value on input range #12939

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merged 4 commits into from May 31, 2018
Merged

Set the correct initial value on input range #12939

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3203e0e
Set the correct initial value on input range
May 30, 2018
1684cfc
Add description and update value diff check for input range
Illu May 30, 2018
cc2d609
add isHydrating argument and tests
May 31, 2018
745ac86
update node value according to isHydrating
May 31, 2018
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8 changes: 7 additions & 1 deletion packages/react-dom/src/client/ReactDOMFiberInput.js
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Expand Up @@ -210,7 +210,11 @@ export function postMountWrapper(element: Element, props: Object) {

if (props.hasOwnProperty('value') || props.hasOwnProperty('defaultValue')) {
const initialValue = '' + node._wrapperState.initialValue;
const currentValue = node.value;

// With range inputs node.value may be a default value calculated from the
// min/max attributes. This ensures that node.value is set with the correct
// value coming from props.
const currentValue = props.type === 'range' ? '' : node.value;

// Do not assign value if it is already set. This prevents user text input
// from being lost during SSR hydration.
Expand All @@ -220,6 +224,8 @@ export function postMountWrapper(element: Element, props: Object) {
// prematurely marking required inputs as invalid
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Woah nice. You added the isHydrating part! Very cool. I have a few questions:

  1. Can you use isHydrating as the condition on line 129, like if (!isHydrating)?
  2. Are the lines between (218-225) necessary? I think the bug was that range inputs never reported "", as required by the old code on line 229, that prevented the value assignment from happening.

Basically, I think the only change we need to make is on line 229:

if (!isHydrating) {
  // ....
}

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Oh, you're absolutely right! I'll update it right away.

if (initialValue !== currentValue) {
node.value = initialValue;
} else if (props.type === 'range') {
node.value = initialValue;
}
}

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