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feat: add observer for 'selected' setter of HTMLOptionElement and try to fix issue #746 #810

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merged 2 commits into from
Jan 26, 2022
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feat: add observer for 'selected' setter of HTMLOptionElement and try to fix issue #746 #810

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1312dbd
feat: add observer for 'selected' setter of HTMLOptionElement and try…
YunFeng0817 Jan 23, 2022
f5f9ecd
style: add description of mechanism
YunFeng0817 Jan 25, 2022
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2 changes: 1 addition & 1 deletion packages/rrweb-snapshot/src/snapshot.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -491,7 +491,7 @@ function serializeNode(
}
}
if (tagName === 'option') {
if ((n as HTMLOptionElement).selected) {
if ((n as HTMLOptionElement).selected && !maskInputOptions['select']) {
attributes.selected = true;
} else {
// ignore the html attribute (which corresponds to DOM (n as HTMLOptionElement).defaultSelected)
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9 changes: 8 additions & 1 deletion packages/rrweb/src/record/observer.ts
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Expand Up @@ -371,8 +371,14 @@ function initInputObserver(
userTriggeredOnInput: boolean,
): listenerHandler {
function eventHandler(event: Event) {
const target = getEventTarget(event);
let target = getEventTarget(event);
const userTriggered = event.isTrusted;
/**
* If a site changes the value 'selected' of an option element, the value of its parent element, usually a select element, will be changed as well.
* We can treat this change as a value change of the select element the current target belongs to.
*/
if (target && (target as Element).tagName === 'OPTION')
target = (target as Element).parentElement;
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please inline the mechanism as comment at here

BTW, is there any doc/spec pointing out the parent element of option should be select?

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No problem, I will add it.

is there any doc/spec pointing out the parent element of option should be select
This is a good point, parent element could also be <optgroup> and <datalist> according to
image captured from OptionElement MDN.
But these two elements aren't hooked for now, so this exception could be excluded by this conditionINPUT_TAGS.indexOf((target as Element).tagName) < 0

if (
!target ||
!(target as Element).tagName ||
Expand Down Expand Up @@ -463,6 +469,7 @@ function initInputObserver(
[HTMLTextAreaElement.prototype, 'value'],
// Some UI library use selectedIndex to set select value
[HTMLSelectElement.prototype, 'selectedIndex'],
[HTMLOptionElement.prototype, 'selected'],
];
if (propertyDescriptor && propertyDescriptor.set) {
handlers.push(
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3 changes: 1 addition & 2 deletions packages/rrweb/test/__snapshots__/integration.test.ts.snap
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Expand Up @@ -6066,8 +6066,7 @@ exports[`record integration tests should not record input values if maskAllInput
\\"type\\": 2,
\\"tagName\\": \\"option\\",
\\"attributes\\": {
\\"value\\": \\"1\\",
\\"selected\\": true
\\"value\\": \\"1\\"
},
\\"childNodes\\": [
{
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