forked from facebook/react
/
ReactTreeTraversal-test.js
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ReactTreeTraversal-test.js
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @emails react-core
*/
'use strict';
let React;
let ReactDOM;
let ReactFeatureFlags = require('shared/ReactFeatureFlags');
const ChildComponent = ({id, eventHandler}) => (
<div
id={id + '__DIV'}
onClickCapture={e => eventHandler(e.currentTarget.id, 'captured', e.type)}
onClick={e => eventHandler(e.currentTarget.id, 'bubbled', e.type)}
onMouseEnter={e => eventHandler(e.currentTarget.id, e.type)}
onMouseLeave={e => eventHandler(e.currentTarget.id, e.type)}>
<div
id={id + '__DIV_1'}
onClickCapture={e => eventHandler(e.currentTarget.id, 'captured', e.type)}
onClick={e => eventHandler(e.currentTarget.id, 'bubbled', e.type)}
onMouseEnter={e => eventHandler(e.currentTarget.id, e.type)}
onMouseLeave={e => eventHandler(e.currentTarget.id, e.type)}
/>
<div
id={id + '__DIV_2'}
onClickCapture={e => eventHandler(e.currentTarget.id, 'captured', e.type)}
onClick={e => eventHandler(e.currentTarget.id, 'bubbled', e.type)}
onMouseEnter={e => eventHandler(e.currentTarget.id, e.type)}
onMouseLeave={e => eventHandler(e.currentTarget.id, e.type)}
/>
</div>
);
const ParentComponent = ({eventHandler}) => (
<div
id="P"
onClickCapture={e => eventHandler(e.currentTarget.id, 'captured', e.type)}
onClick={e => eventHandler(e.currentTarget.id, 'bubbled', e.type)}
onMouseEnter={e => eventHandler(e.currentTarget.id, e.type)}
onMouseLeave={e => eventHandler(e.currentTarget.id, e.type)}>
<div
id="P_P1"
onClickCapture={e => eventHandler(e.currentTarget.id, 'captured', e.type)}
onClick={e => eventHandler(e.currentTarget.id, 'bubbled', e.type)}
onMouseEnter={e => eventHandler(e.currentTarget.id, e.type)}
onMouseLeave={e => eventHandler(e.currentTarget.id, e.type)}>
<ChildComponent id="P_P1_C1" eventHandler={eventHandler} />
<ChildComponent id="P_P1_C2" eventHandler={eventHandler} />
</div>
<div
id="P_OneOff"
onClickCapture={e => eventHandler(e.currentTarget.id, 'captured', e.type)}
onClick={e => eventHandler(e.currentTarget.id, 'bubbled', e.type)}
onMouseEnter={e => eventHandler(e.currentTarget.id, e.type)}
onMouseLeave={e => eventHandler(e.currentTarget.id, e.type)}
/>
</div>
);
describe('ReactTreeTraversal', () => {
const mockFn = jest.fn();
let container;
let outerNode1;
let outerNode2;
beforeEach(() => {
React = require('react');
ReactDOM = require('react-dom');
mockFn.mockReset();
container = document.createElement('div');
outerNode1 = document.createElement('div');
outerNode2 = document.createElement('div');
document.body.appendChild(container);
document.body.appendChild(outerNode1);
document.body.appendChild(outerNode2);
ReactDOM.render(<ParentComponent eventHandler={mockFn} />, container);
});
afterEach(() => {
document.body.removeChild(container);
document.body.removeChild(outerNode1);
document.body.removeChild(outerNode2);
container = null;
outerNode1 = null;
outerNode2 = null;
});
describe('Two phase traversal', () => {
it('should not traverse when target is outside component boundary', () => {
outerNode1.dispatchEvent(
new MouseEvent('click', {bubbles: true, cancelable: true}),
);
expect(mockFn).not.toHaveBeenCalled();
});
it('should traverse two phase across component boundary', () => {
const expectedCalls = [
['P', 'captured', 'click'],
['P_P1', 'captured', 'click'],
['P_P1_C1__DIV', 'captured', 'click'],
['P_P1_C1__DIV_1', 'captured', 'click'],
['P_P1_C1__DIV_1', 'bubbled', 'click'],
['P_P1_C1__DIV', 'bubbled', 'click'],
['P_P1', 'bubbled', 'click'],
['P', 'bubbled', 'click'],
];
const node = document.getElementById('P_P1_C1__DIV_1');
node.dispatchEvent(
new MouseEvent('click', {bubbles: true, cancelable: true}),
);
expect(mockFn.mock.calls).toEqual(expectedCalls);
});
it('should traverse two phase at shallowest node', () => {
const node = document.getElementById('P');
node.dispatchEvent(
new MouseEvent('click', {bubbles: true, cancelable: true}),
);
const expectedCalls = [
['P', 'captured', 'click'],
['P', 'bubbled', 'click'],
];
expect(mockFn.mock.calls).toEqual(expectedCalls);
});
});
describe('Enter leave traversal', () => {
it('should not traverse when enter/leaving outside DOM', () => {
outerNode1.dispatchEvent(
new MouseEvent('mouseout', {
bubbles: true,
cancelable: true,
relatedTarget: outerNode2,
}),
);
expect(mockFn).not.toHaveBeenCalled();
});
it('should not traverse if enter/leave the same node', () => {
const leaveNode = document.getElementById('P_P1_C1__DIV_1');
const enterNode = document.getElementById('P_P1_C1__DIV_1');
leaveNode.dispatchEvent(
new MouseEvent('mouseout', {
bubbles: true,
cancelable: true,
relatedTarget: enterNode,
}),
);
expect(mockFn).not.toHaveBeenCalled();
});
it('should traverse enter/leave to sibling - avoids parent', () => {
const leaveNode = document.getElementById('P_P1_C1__DIV_1');
const enterNode = document.getElementById('P_P1_C1__DIV_2');
const expectedCalls = [
['P_P1_C1__DIV_1', 'mouseleave'],
// enter/leave shouldn't fire anything on the parent
['P_P1_C1__DIV_2', 'mouseenter'],
];
leaveNode.dispatchEvent(
new MouseEvent('mouseout', {
bubbles: true,
cancelable: true,
relatedTarget: enterNode,
}),
);
expect(mockFn.mock.calls).toEqual(expectedCalls);
});
it('should traverse enter/leave to parent - avoids parent', () => {
const leaveNode = document.getElementById('P_P1_C1__DIV_1');
const enterNode = document.getElementById('P_P1_C1__DIV');
const expectedCalls = [['P_P1_C1__DIV_1', 'mouseleave']];
leaveNode.dispatchEvent(
new MouseEvent('mouseout', {
bubbles: true,
cancelable: true,
relatedTarget: enterNode,
}),
);
expect(mockFn.mock.calls).toEqual(expectedCalls);
});
// This will not work with the modern event system that
// attaches event listeners to roots as the event below
// is being triggered on a node that React does not listen
// to any more. Instead we should fire mouseover.
if (ReactFeatureFlags.enableModernEventSystem) {
it('should enter from the window', () => {
const enterNode = document.getElementById('P_P1_C1__DIV');
const expectedCalls = [
['P', 'mouseenter'],
['P_P1', 'mouseenter'],
['P_P1_C1__DIV', 'mouseenter'],
];
enterNode.dispatchEvent(
new MouseEvent('mouseover', {
bubbles: true,
cancelable: true,
relatedTarget: outerNode1,
}),
);
expect(mockFn.mock.calls).toEqual(expectedCalls);
});
} else {
it('should enter from the window', () => {
const enterNode = document.getElementById('P_P1_C1__DIV');
const expectedCalls = [
['P', 'mouseenter'],
['P_P1', 'mouseenter'],
['P_P1_C1__DIV', 'mouseenter'],
];
outerNode1.dispatchEvent(
new MouseEvent('mouseout', {
bubbles: true,
cancelable: true,
relatedTarget: enterNode,
}),
);
expect(mockFn.mock.calls).toEqual(expectedCalls);
});
}
// This will not work with the modern event system that
// attaches event listeners to roots as the event below
// is being triggered on a node that React does not listen
// to any more. Instead we should fire mouseover.
if (ReactFeatureFlags.enableModernEventSystem) {
it('should enter from the window to the shallowest', () => {
const enterNode = document.getElementById('P');
const expectedCalls = [['P', 'mouseenter']];
enterNode.dispatchEvent(
new MouseEvent('mouseover', {
bubbles: true,
cancelable: true,
relatedTarget: outerNode1,
}),
);
expect(mockFn.mock.calls).toEqual(expectedCalls);
});
} else {
it('should enter from the window to the shallowest', () => {
const enterNode = document.getElementById('P');
const expectedCalls = [['P', 'mouseenter']];
outerNode1.dispatchEvent(
new MouseEvent('mouseout', {
bubbles: true,
cancelable: true,
relatedTarget: enterNode,
}),
);
expect(mockFn.mock.calls).toEqual(expectedCalls);
});
}
it('should leave to the window', () => {
const leaveNode = document.getElementById('P_P1_C1__DIV');
const expectedCalls = [
['P_P1_C1__DIV', 'mouseleave'],
['P_P1', 'mouseleave'],
['P', 'mouseleave'],
];
leaveNode.dispatchEvent(
new MouseEvent('mouseout', {
bubbles: true,
cancelable: true,
relatedTarget: outerNode1,
}),
);
expect(mockFn.mock.calls).toEqual(expectedCalls);
});
it('should leave to the window from the shallowest', () => {
const leaveNode = document.getElementById('P');
const expectedCalls = [['P', 'mouseleave']];
leaveNode.dispatchEvent(
new MouseEvent('mouseout', {
bubbles: true,
cancelable: true,
relatedTarget: outerNode1,
}),
);
expect(mockFn.mock.calls).toEqual(expectedCalls);
});
});
});