Reactjs将方法作为道具传递给子

Question

有没有办法将当前类的方法作为props传递给子类

举个例子;

var SignupModal = React.createClass({
mixins: [CheckMixin],
getInitialState: function(){
  return {
      'wizardstate': 0
  }
},
setWizardState: function(state){
    var that = this;
    switch (state){
        case 0:
           that.setState({'wizardstate': 0});
           break;
        case 1:
            that.setState({'wizardstate': 1});
            break;
        case 2:
            that.setState({'wizardstate': 2});
            break;
        case 3:
            that.setState({'wizardstate': 3});
            break;
        case 4:
            that.setState({'wizardstate': 4});
            break;
    }
},
render: function(){
    var temp;
    switch (this.state.wizardstate){
        case 0:
           temp = (<SignupSetup setWizardState={this.setWizardState}/>);
            break;
        case 1:
            temp = (<EmailSetup />);
            break;
        case 2:
            temp = (<PasswordSetup />);
            break;
        case 3:
            temp =  (<UsernameSetup />);
            break;
        case 4:
            temp = (<CategoriesSetup />);
            break;
    }
    return (<Modal {...this.props} title="Login" animation={false}>
            <div className="modal-body">
                <div>
                {temp}
                </div>
            </div>
        </Modal>)


var SignupSetup = React.createClass({
    render: function(){
        return (<Button onClick={this.props.setWizardState(1)}></Button>)
    }
});

我想将SignupModal的setWizardState方法传递给子SignupSetup作为prop，但是我得到了错误

Uncaught Error: Invariant Violation: replaceState(...): Cannot update during an existing state transition (such as withinrender). Render methods should be a pure function of props and state.react.js:17122

Answer 1

问题在这里：

<Button onclick={this.props.setWizardState(1)}></Button>

首先是拼写错误（onClick，大写字母C）。但主要的问题是你正在调用setWizardState，而onClick需要一个函数。你需要部分应用它。

onClick={this.props.setWizardState.bind(null, 1)}

Answer 2

如果您有像Babel这样的编译器，也可以使用es6箭头表示法

<Button onclick={() => this.props.setWizardState(1)}></Button>

Answer 3

这是官方reactjs网站上的a link。显然你需要绑定这个函数而不是直接应用。

onClick={this.setWizardState.bind(this, 1)}