Inputs should not mutate value on type conversion (when they stringify to the same thing) #9806
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This is a follow-up on facebook#9584 (comment). There is no need to assign the value property of an input if the value property of the React component changes types, but stringifies to the same value. For example: ```javascript DOM.render(<input value="true" />, el) DOM.render(<input value={true} />, el) ``` In this case, the assignment to `input.value` will always be cast to the string "true". There is no need to perform this assignment. Particularly when we already cast the value to a string later: ```javascript // Cast `value` to a string to ensure the value is set correctly. While // browsers typically do this as necessary, jsdom doesn't. node.value = '' + value; ```
nhunzaker
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cc @flarnie We'll want to get this into 15.6, right? |
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@aweary If it looks good please merge 😉 Otherwise it might hang here for a long time. |
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I second what @gaearon said - @aweary or @nhunzaker feel free to merge and then I'm happy to cherry-pick this to 15.6-dev. |
flarnie
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This is a follow-up on #9584 (comment). There is no need to assign the value property of an input if the value property of the React component changes types, but stringifies to the same value. For example: ```javascript DOM.render(<input value="true" />, el) DOM.render(<input value={true} />, el) ``` In this case, the assignment to `input.value` will always be cast to the string "true". There is no need to perform this assignment. Particularly when we already cast the value to a string later: ```javascript // Cast `value` to a string to ensure the value is set correctly. While // browsers typically do this as necessary, jsdom doesn't. node.value = '' + value; ```
flarnie
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Jun 7, 2017
This is a follow-up on facebook#9584 (comment). There is no need to assign the value property of an input if the value property of the React component changes types, but stringifies to the same value. For example: ```javascript DOM.render(<input value="true" />, el) DOM.render(<input value={true} />, el) ``` In this case, the assignment to `input.value` will always be cast to the string "true". There is no need to perform this assignment. Particularly when we already cast the value to a string later: ```javascript // Cast `value` to a string to ensure the value is set correctly. While // browsers typically do this as necessary, jsdom doesn't. node.value = '' + value; ```
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This is a follow-up on #9584 (comment). There is no need to assign the value property of an input if the value property of the React component changes types, but stringifies to the same value. For example:
In this case, the assignment to
input.valuewill always be cast to the string "true". There is no need to perform this assignment. Particularly when we already cast the value to a string later:Testing
I've put up a build of the DOM fixtures for this branch here:
http://nh-input-type-conversion.surge.sh