anu/index8.html at master · YMFE/anu · GitHub

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<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
   <script type='text/javascript' src="./dist/React.js"></script>
   <script src="./lib/ReactTestUtils.js"></script>
   <!--<script src="./test/react.js"></script>
    <script src="./test/react-dom.js"></script>-->
    <script src="./lib/babel.js"></script>
    <script type='text/babel'>
    var s, testRefsComponent
window.onload = function(){
 var expect = function(a) {
    return {
        toBe: function(b) {
            console.log(a, b, a === b)
        }
    }
}
  class ClickCounter extends React.Component {
  state = {count: this.props.initialCount};

  triggerReset = () => {
    this.setState({count: this.props.initialCount});
  };

  handleClick = () => {
    this.setState({count: this.state.count + 1});
  };

  render() {
    var children = [];
    var i;
    for (i = 0; i < this.state.count; i++) {
      children.push(
        <div
          className="clickLogDiv"
          key={'clickLog' + i}
          ref={'clickLog' + i}
        />,
      );
    }
    return (
      <span className="clickIncrementer" onClick={this.handleClick}>
        {children}
      </span>
    );
  }
}

/**
 * Only purpose is to test that refs are tracked even when applied to a
 * component that is injected down several layers. Ref systems are difficult to
 * build in such a way that ownership is maintained in an airtight manner.
 */
class GeneralContainerComponent extends React.Component {
  render() {
    return <div>{this.props.children}</div>;
  }
}

/**
 * Notice how refs ownership is maintained even when injecting a component
 * into a different parent.
 */
class TestRefsComponent extends React.Component {
  doReset = () => {
    console.log("triggerReset")
    this.refs.myCounter.triggerReset();
  };

  render() {
    return (
      <div>
        <div ref="resetDiv" onClick={this.doReset}>
          Reset Me By Clicking This.
        </div>
        <GeneralContainerComponent ref="myContainer">
          <ClickCounter ref="myCounter" initialCount={1} />
        </GeneralContainerComponent>
      </div>
    );
  }
}

/**
 * Render a TestRefsComponent and ensure that the main refs are wired up.
 */
var renderTestRefsComponent = function() {
  var testRefsComponent = ReactTestUtils.renderIntoDocument(
    <TestRefsComponent />,
  );
  expect(testRefsComponent instanceof TestRefsComponent).toBe(true);

  var generalContainer = testRefsComponent.refs.myContainer;
  expect(generalContainer instanceof GeneralContainerComponent).toBe(true);

  var counter = testRefsComponent.refs.myCounter;
  expect(counter instanceof ClickCounter).toBe(true);

  return testRefsComponent;
};

var expectClickLogsLengthToBe = function(instance, length) {
  var clickLogs = ReactTestUtils.scryRenderedDOMComponentsWithClass(
    instance,
    'clickLogDiv',
  );
  expect(clickLogs.length).toBe(length);
  expect(Object.keys(instance.refs.myCounter.refs).length).toBe(length);
};

 testRefsComponent = renderTestRefsComponent();
    var clickIncrementer = ReactTestUtils.findRenderedDOMComponentWithClass(
      testRefsComponent,
      'clickIncrementer',
    );

    expectClickLogsLengthToBe(testRefsComponent, 1);

    // After clicking the reset, there should still only be one click log ref.
    ReactTestUtils.Simulate.click(testRefsComponent.refs.resetDiv);
    expectClickLogsLengthToBe(testRefsComponent, 1);

    // Begin incrementing clicks (and therefore refs).
    ReactTestUtils.Simulate.click(clickIncrementer);
    expectClickLogsLengthToBe(testRefsComponent, 2);

    ReactTestUtils.Simulate.click(clickIncrementer);
    expectClickLogsLengthToBe(testRefsComponent, 3);

    // Now reset again
    ReactTestUtils.Simulate.click(testRefsComponent.refs.resetDiv);
    expectClickLogsLengthToBe(testRefsComponent, 1);


}
    </script>
</head>

<body>

    <div>这个默认会被清掉</div>
    <div id='example'></div>


</body>

</html>