可能未处理的承诺被拒绝,使用axios的网络错误

时间:2018-09-25 04:15:54

标签: javascript reactjs react-native axios expo

我正在尝试使用react-native,axios和expo发送JSON,但是当我在应用程序上按“发送”时,出现以下警告:

可能未处理的承诺被拒绝,错误:网络错误

当我尝试通过Postman发送通知时,我的API正确接收了通知(JSON),但是当我尝试通过axios通过react-native发送通知时,我收到了警告消息,所以也许react未发送数据正确。

最大的问题是使用axios而不是fetch的承诺

export default class NotificationsInput extends React.Component {

state = {
    token: '',
    title: '',
    body: ''
}

handleToken = event => {
    this.setState({ token: event.target.value })
}

handleTitle = event => {
    this.setState({ title: event.target.value })
}

handleBody = event => {
    this.setState({ body: event.target.value })
}

handleSubmit = event => {
    event.preventDefault();

    let notification = JSON.stringify({
        token: this.state.token,
        title: this.state.title,
        body: this.state.body
    })

    let headers = {
        headers: {
            'Accept': 'application/json',
            'Content-Type': 'application/json'
        }

    }
    axios.post(`http://127.0.0.1:8000/send_push_message/`, notification, headers)
        .then(res => {
            console.log(res);
            console.log(res.data)
        })
        .then(error => console.log(error));

}

render() {
    return (
        <View>
            <TextInput onChange={this.handleToken}
                style={{ height: 25, width: 200, borderColor: 'black', borderWidth: 1 }}
            />
            <TextInput onChange={this.handleTitle}
                style={{ height: 40, width: 200, borderColor: 'black', borderWidth: 1 }}
            />
            <TextInput onChange={this.handleBody}
                style={{ height: 40, width: 200, borderColor: 'black', borderWidth: 1 }}
            />
            <Button onPress={this.handleSubmit} title="Send">Send</Button>
        </View>
    )
}

}

编辑我添加了catch()函数,但现在错误仅是控制台中的“网络错误”

handleSubmit = event => {
    event.preventDefault();

    let notification = JSON.stringify({
        token: this.state.token,
        title: this.state.title,
        body: this.state.body
    })

    let headers = {
        headers: {
            'Accept': 'application/json',
            'Content-Type': 'application/json'
        }

    }
    axios.post(`http://127.0.0.1:8000/send_push_message/`, notification, headers)
    .then(res => {
        console.log(res);
        console.log(res.data)
    })
    .catch(error => console.log(error));

}

2 个答案:

答案 0 :(得分:0)

使用catch代替错误处理。

.catch(error => console.log(error));

答案 1 :(得分:0)

我可以看到您已将两个链接在一起,然后是不正确的。您需要一个catch块来捕获网络错误。在下面看看

  axios.post(`http://127.0.0.1:8000/send_push_message/`, notification, headers)
    .then(res => {
        console.log(res);
        console.log(res.data)
    })
    .catch(error => console.log(error));