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fix: Mitigate Safari memory leak for input element #4250

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fix: Mitigate Safari memory leak for input element #4250

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23c4197
fix: remove changes
May 15, 2024
507e30a
fix: remove changes
May 15, 2024
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67 changes: 59 additions & 8 deletions packages/textfield/src/Textfield.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -204,6 +204,17 @@ export class TextfieldBase extends ManageHelpText(
return this.inputElement;
}

private _eventHandlers = {
input: this.handleInput.bind(this),
change: this.handleChange.bind(this),
focus: this.onFocus.bind(this),
blur: this.onBlur.bind(this),
};

protected _firstUpdateAfterConnected = false;

protected abortController?: AbortController;

/**
* Sets the start and end positions of the current selection.
*
Expand Down Expand Up @@ -316,10 +327,6 @@ export class TextfieldBase extends ManageHelpText(
pattern=${ifDefined(this.pattern)}
placeholder=${this.placeholder}
.value=${this.displayValue}
@change=${this.handleChange}
@input=${this.handleInput}
@focus=${this.onFocus}
@blur=${this.onBlur}
?disabled=${this.disabled}
?required=${this.required}
?readonly=${this.readonly}
Expand Down Expand Up @@ -351,10 +358,6 @@ export class TextfieldBase extends ManageHelpText(
pattern=${ifDefined(this.pattern)}
placeholder=${this.placeholder}
.value=${live(this.displayValue)}
@change=${this.handleChange}
@input=${this.handleInput}
@focus=${this.onFocus}
@blur=${this.onBlur}
?disabled=${this.disabled}
?required=${this.required}
?readonly=${this.readonly}
Expand Down Expand Up @@ -389,6 +392,54 @@ export class TextfieldBase extends ManageHelpText(
super.update(changedProperties);
}

public override connectedCallback(): void {
super.connectedCallback();
this._firstUpdateAfterConnected = true;
this.requestUpdate();
}

public override disconnectedCallback(): void {
// Cleanup all event listeners and and remove input element from DOM
this.abortController?.abort();
super.disconnectedCallback();
}

protected firstUpdateAfterConnected(): void {
this.abortController = new AbortController();
const { signal } = this.abortController;

this.inputElement.addEventListener(
'change',
this._eventHandlers['change'],
{ signal }
);
this.inputElement.addEventListener(
'input',
this._eventHandlers['input'],
{ signal }
);
this.inputElement.addEventListener(
'focus',
this._eventHandlers['focus'],
{ signal }
);
this.inputElement.addEventListener(
'blur',
this._eventHandlers['blur'] as EventListener,
{ signal }
);
}

protected override updated(changedProperties: PropertyValues): void {
super.updated(changedProperties);
// Adding this here instead of firstUpdated because we want to make sure
// this is called again on the first update after a previous disconnect
if (this._firstUpdateAfterConnected) {
this._firstUpdateAfterConnected = false;
this.firstUpdateAfterConnected();
}
}

public checkValidity(): boolean {
let validity = this.inputElement.checkValidity();
if (this.required || (this.value && this.pattern)) {
Expand Down