Angular2 Change Detection, Тимофей Яценко, MoscowJS 31
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Transcript of Angular2 Change Detection, Тимофей Яценко, MoscowJS 31
<parent prop1="exp1" prop2="exp2">
<child prop3="exp3" prop4="exp4"></child>
</parent>
<parent prop1="exp1" prop2="exp2">
<child prop3="exp3" prop4="exp4"></child>
</parent>
while (op) {
const getter = getterFor(op.fieldName);
const oldValue = op.value;
const newValue = getter(op.context);
if (oldValue !== newValue) {
op.value = newValue;
const fn = reactionFunctionFor(op);
fn(oldValue, newValue);
}
op = op.next;
}
<formatted-rating [rating]="talk.rating"/>
const talk = obj.talk;
const rating = talk.rating;
if (rating !== this.previousRating) {
this.previousRating = rating;
this.formattedRatingComponent.rating = rating;
}
<formatted-rating [rating]="talk.rating"/>
<formatted-rating [rating]="talk.rating"/>
class Talk_ChangeDetector {
//...
detectChanges() {
//...
const talk = obj.talk;
const rating = talk.rating;
if (rating !== this.previousRating) {
this.previousRating = rating;
this.formattedRatingComponent.rating = rating;
}
}
}
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//code
a();
setTimeout(b, 0);
setTimeout(c, 0);
d();
//run order
a
d
b // async
c // async
b
c
//code
start();
a();
setTimeout(b, 0);
setTimeout(c, 0);
d();
stop();
// start
a
d
// stop
b // missed
c // missed
start();
a();
d();
end();
start();
b();
end();
start();
c();
end();
onZoneEnter();
a();
d();
onZoneLeave();
onZoneEnter();
b();
onZoneLeave();
onZoneEnter();
c();
onZoneLeave();
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socket.on('data', (data) => {
model.data = data;
$scope.$apply();
});
