Javascript React本机Firebase仅获取一个数据
如何仅获取一个数据并将其写入标头?Javascript React本机Firebase仅获取一个数据,javascript,reactjs,firebase,react-native,firebase-realtime-database,Javascript,Reactjs,Firebase,React Native,Firebase Realtime Database,如何仅获取一个数据并将其写入标头? 我正在使用firebase和react redux firebase结构我试着写“组织机构””:inovanka: 操作文件代码: import firebase from 'firebase'; import { Actions } from 'react-native-router-flux'; import { ORGANIZATION_NAME_DATA_SUCCESS } from './types'; export const organi
我正在使用firebase和react redux firebase结构我试着写“组织机构””:inovanka: 操作文件代码:
import firebase from 'firebase';
import { Actions } from 'react-native-router-flux';
import { ORGANIZATION_NAME_DATA_SUCCESS } from './types';
export const organizationName = () => {
const { currentUser } = firebase.auth();
return (dispatch) => {
firebase.database().ref(`/organizations/${currentUser.uid}`)
.on('value', snapshot => {
dispatch({ type: ORGANIZATION_NAME_DATA_SUCCESS, payload: snapshot.val() });
});
};
}
减速器文件:
import { ORGANIZATION_NAME_DATA_SUCCESS } from '../actions/types';
const INITIAL_STATE = {
};
export default (state = INITIAL_STATE, action) => {
switch (action.type) {
case ORGANIZATION_NAME_DATA_SUCCESS:
console.log(action); // data retrieved as array
return action.payload
default:
return state;
}
};
组件:(我想把它写到这个)
类主页扩展组件{
componentWillMount(){
}
render(){
返回(
我想把它写在这里
);
}
}
常量mapStateToProps=({homepageResponse})=>{
const organizationArray=\映射(homepageResponse,(val,uid)=>{
返回{…val,uid}//
});
返回{organizationArray};
};
导出默认连接(MapStateTops,{organizationName})(主页);
更改此选项:
firebase.database().ref(`/organizations/${currentUser.uid}`)
.on('value', snapshot => {
为此:
firebase.database().ref(`/organizations/${currentUser.uid}`)
.once('value', snapshot => {
使用once()
将只读取一次数据,因此只获取一个数据更改此设置:
firebase.database().ref(`/organizations/${currentUser.uid}`)
.on('value', snapshot => {
为此:
firebase.database().ref(`/organizations/${currentUser.uid}`)
.once('value', snapshot => {
使用once()
将只读取一次数据,因此只获取一个数据解决方案就在这里
操作文件:
export const organizationName = () => {
const { currentUser } = firebase.auth();
return (dispatch) => {
firebase.database().ref(`/organizations/${currentUser.uid}`)
.once('value', snapshot => {
_.mapValues(snapshot.val(), o => {
console.log(o);
dispatch({ type: ORGANIZATION_NAME_DATA_SUCCESS, payload: {organization: o.organization, fullname: o.fullname }});
});
});
};
}
render() {
return (
<Container>
<Header>
<Text> { this.props.organization } </Text>
</Header>
</Container>
}
缩减器文件
组件文件映射到状态props和组件willmount
*最后一步标题*
export const organizationName = () => {
const { currentUser } = firebase.auth();
return (dispatch) => {
firebase.database().ref(`/organizations/${currentUser.uid}`)
.once('value', snapshot => {
_.mapValues(snapshot.val(), o => {
console.log(o);
dispatch({ type: ORGANIZATION_NAME_DATA_SUCCESS, payload: {organization: o.organization, fullname: o.fullname }});
});
});
};
}
render() {
return (
<Container>
<Header>
<Text> { this.props.organization } </Text>
</Header>
</Container>
}
render(){
返回(
{this.props.organization}
}
谢谢大家解决方案就在这里
操作文件:
export const organizationName = () => {
const { currentUser } = firebase.auth();
return (dispatch) => {
firebase.database().ref(`/organizations/${currentUser.uid}`)
.once('value', snapshot => {
_.mapValues(snapshot.val(), o => {
console.log(o);
dispatch({ type: ORGANIZATION_NAME_DATA_SUCCESS, payload: {organization: o.organization, fullname: o.fullname }});
});
});
};
}
render() {
return (
<Container>
<Header>
<Text> { this.props.organization } </Text>
</Header>
</Container>
}
缩减器文件
组件文件映射到状态props和组件willmount
*最后一步标题*
export const organizationName = () => {
const { currentUser } = firebase.auth();
return (dispatch) => {
firebase.database().ref(`/organizations/${currentUser.uid}`)
.once('value', snapshot => {
_.mapValues(snapshot.val(), o => {
console.log(o);
dispatch({ type: ORGANIZATION_NAME_DATA_SUCCESS, payload: {organization: o.organization, fullname: o.fullname }});
});
});
};
}
render() {
return (
<Container>
<Header>
<Text> { this.props.organization } </Text>
</Header>
</Container>
}
render(){
返回(
{this.props.organization}
}
谢谢大家Firebase实时数据库:organizations JJaDV2z4zsdHUaGdqLuBVN2KY903-L7TxaX4jgvsdPfG9YRp organization:“inovanka”为用户只获取一个组织,
Firebase.database().ref(`/organizations/${currentUser.uid}').orderByKey().limitToFirst(1).on('value',snapshot=>{
。谢谢您,先生,我尝试了您的代码和console.log(操作)。但是console.log是空的。@FrankvanPuffelen是的,我再试了一次。它只获取了一个数据。但是我想。一次('value',快照也可以使用。感谢firebase实时数据库:organizations JJaDV2z4zsdHUaGdqLuBVN2KY903-L7TX4JGVSDPFG9YRP organization:“inovanka”为用户仅获取一个组织,firebase.database().ref(`/organizations/${currentUser.uid}')。orderByKey().limitToFirst(1)。on('value',snapshot=>{
。谢谢您,先生,我尝试了您的代码和console.log(操作)。但是console.log是空的。@FrankvanPuffelen是的,我又尝试了一次。它只获取了一个数据。但是我想。一次(“值”,快照也可以工作。谢谢你好,彼得,是的,我已经尝试过了。它只获取一个数据。谢谢你,先生。现在我应该把数据写到你能帮我吗?你好,彼得,是的,我已经试过了。它只获取一个数据。谢谢你,先生。现在我应该把数据写到你能帮我吗?