Question

我正在尝试使用状态设置复选框的复选支柱，使用handleChange函数更新代码：

getInitialState: function() {
    return {
        selected:0,
        contactId: 0
    };
},

handleChange: function(e) {
    var id = this.state.contactId;

    console.log(e.target.checked);

    if (e.target.checked === true){

        console.log('selected');

        contactChannel.publish({
                    channel: "contact",
                    topic: "selectedContact",
                    data: {
                        id: [id]
                    }});

    } else{

        basketChannel.publish({
            channel: "basket",
            topic: "removePersonFromBasket",
            data: {
                id: [id]
            }
        });


        console.log('deselected flag');


    }
},
render: function() {

    var id = this.state.contactId;
    var isSelected = this.state.selected;

    console.log(isSelected);

    return (
        <div className="contact-selector">
            <input type="checkbox"
                   checked={isSelected}
                onChange={this.handleChange} />
        </div>
    );
}

但是，默认情况下选中复选框后我无法取消选中，有人可以告诉我该怎么做吗？

非常感谢

Answer 1

在Key k = KeyFactory.createKey("Employee", 100); Entity e = new Entity("Employee", k);函数中，您始终对复选框的状态使用相同的值，但您需要将其反转。

将此添加到handleChange函数：

handleChange

Answer 2

问题是因为你使用错误的变量返回。使用{isSelected}更改{this.state.selected}应该有效。

getInitialState: function() {
    return {
        selected:0,
        contactId: 0
    };
},


render: function() {

    var id = this.state.contactId;
    var isSelected = this.state.selected;

    console.log(isSelected);

    return (
        <div className="contact-selector">
            <input type="checkbox"
                   checked={this.state.selected}
                onChange={this.handleChange} />
        </div>
    );
}

Answer 3

getInitialState: function() {
    return {
        selected:0,
        contactId: 0
    };
},

handleChange:function(event){
    this.setState({selected: !this.state.selected});
    isSelected = this.state.selected;

    console.log(isSelected);
}

render: function() {

    var id = this.state.contactId;
    var isSelected = this.state.selected;

    console.log(isSelected);

    return (
        <div className="contact-selector">
            <input type="checkbox"
                   checked={isSelected}
                onChange={this.handleChange} />
        </div>
    );
}

ReactJs Checkbox - 无法取消选中

3 个答案: