React-Native Navigation without render command

React-Native Navigation without render command - javascript

Is there anyway to redirect user to a different component (also passing arguments with it) without calling render function?
almost in all tutorials i found, they use sameway :
render() {
return (
<NavigatorIOS
style={styles.container}
initialRoute=\{\{
title: 'first',
component: First
}} />
);
}
Now see my code :
in renderRow , for touchablehighlights , i need to be able to redirect user to a page with an argument, (in this case i need to send user to component CourseDetail with argument of course_id, so i can show user course's details)
class Courses extends Component {
constructor(props) {
super(props);
this.state = {
dataSource: new ListView.DataSource({
rowHasChanged: (row1, row2) => row1 !== row2,
}),
loaded: false,
};
}
fetchData() {
// fetching data here
}
componentDidMount() {
this.fetchData();
}
render(){
if (!this.state.loaded) {
return this.renderLoadingView();
}
return (
<View style={{
flex: 1
}}>
<ListView
dataSource={this.state.dataSource}
renderRow={this.renderRow}
style={styles.listView}
/>
</View>
);
}
renderRow(data) {
var header = (
<View>
<View style={styles.rowContainer}>
<View style={styles.textContainer}>
<Text style={styles.title}>{data.nid}</Text>
<Text style={styles.description} numberOfLines={0}>{data.title}</Text>
</View>
</View>
<View style={styles.separator}></View>
</View>
);
///////////
var cid = [];
var content = [];
for(let x=0; x < Object.keys(data.course).length; x++){
cid[x] = data.course[x].course_id;
content.push(
<TouchableHighlight
underlayColor='#e3e0d7'
key={x}
onPress={()=>{console.log(cid[x]);}} //// i need to navigate user to a page with passing arguments (course_id in this case)
style={styles.child}
>
<Text style={styles.child}>
{data.course[x].title}
</Text>
</TouchableHighlight>
);
}
console.log(cid);
var clist = (
<View style={styles.rowContainer}>
{content}
</View>
);
////////////
return (
<Accordion
header={header}
content={clist}
easing="easeOutCubic"
/>
);
}
renderLoadingView() {
return (
<View style={styles.loading}>
<Text style={styles.loading}>
Loading Courses, please wait...
</Text>
</View>
);
}
}
module.exports = Courses;
Thanks in Advance!

By help of this Question here :
React-Native: Cannot access state values or any methods declared from renderRow
I was able to solve the issue by changing :
<ListView
dataSource={this.state.dataSource}
renderRow={this.renderRow}
style={styles.listView}
/>
To :
<ListView
dataSource={this.state.dataSource}
renderRow={this.renderRow.bind(this)}
style={styles.listView}
/>
Hope it will help others who may have the same problem.

Related

Show Loader when a button is clicked

I'm trying to obtain a loader when a button is clicked (for a signup) without create another page (only to show the loader).
How can I do??
This is my code and what I tried (but it doesn't appears)
class Signup extends Component {
constructor(props) {
super(props);
this.state = {
//code about signup
isLoading: false
};
}
showLoader = () =>{
this.setState({ isLoading: true})
this.registrazione()
}
registrazione() {
//code about signup
}
render() {
return (
<View style={style.container}>
//code about signup
<View style={style.footer}>
<TouchableOpacity
style={[style.button, style.buttonOK]}
onPress={() => this.showLoader()}
>
<Text style={[style.buttonTesto]}>Signup</Text>
</TouchableOpacity>
<ActivityIndicator animating={this.state.isLoading} size="large" color="#56cbbe" />
</View>
</KeyboardAwareScrollView>
</View>
</View>
);
}
}

First of all you have one closing View tag that is not needed.
Assuming that's just mistake in question, you could do it with JS ternary operator. Like this:
<View style={style.container}>
//code about signup
<View style={style.footer}>
{(!this.state.isLoading) ? <TouchableOpacity
style={[style.button, style.buttonOK]}
onPress={() => this.showLoader()}
>
<Text style={[style.buttonTesto]}>Signup</Text>
</TouchableOpacity> : <ActivityIndicator animating={this.state.isLoading} size="large" color="#56cbbe" />}
</View>
</KeyboardAwareScrollView>
</View>
You can learn more about ternary operators here
This should replace your button with loading animation.
Don't hesitate to ask any more questions if you have any! I'm glad to help!

How to get user id from firebase in react native?

I need your help I'm using firebase for my app. I'm trying to get the users ID not the logged users no all users I have. I want to show their (uid) simply like in an alert for each user. Also, I'm showing them in a flatlist and when I set item.uid in an alert it shows (undefined). But, all the other data of the user is shown correctly. This what I did until now:
**
users.js
**
export default class usersList extends React.Component{
state = {
loading: false,
uid: '',
users: [],
items: []
};
componentDidMount() {
let itemsRef = f.database().ref('users').once('value').then(snapshot => {
var data = snapshot.val();
var items = Object.values(data);
this.setState({items});
console.log(snapshot.val())
});
}
renderItem({item}) {
return (
<View key={index} style={{width: '100%', overflow:'hidden', marginBottom: 5, justifyContent:'space-between', borderBottomWidth:1, borderColor: 'grey'}}>
<View>
<View style={{padding:5, width:'100%', flexDirection: 'row', justifyContent: 'space-between'}}>
<Text>{item.email}</Text>
</View>
</View>
</View>
)
}
render() {
return (
<View style={styles.container}>
<ScrollView>
{
this.state.items.length > 0
? <ItemComponent items={this.state.items} navigation={this.props.navigation} />
: <Text>No stores</Text>
}
</ScrollView>
</View>
);
}
}
//ItemComponent.js
export default class ItemComponent extends Component {
static propTypes = {
items: PropTypes.array.isRequired
};
render() {
return (
<View style={styles.itemsList}>
{this.props.items.map((item, index) => {
return (
<View key={index}>
<TouchableOpacity
onPress={ () => alert(item.uid)}>
<Text style={styles.itemtext}>{item.email}</Text>
</TouchableOpacity>
</View>
)
})}
</View>
);
}
}

firebase.database().ref('user').on('value', (datasnapshot) => {
this.setState({
_id: datasnapshot.key
});`

This solution worked for me
<Text style={styles.yourStyleHere}>UID: {auth.currentUser?.uid} </Text>

How to avoid jsx styling error in react native?

Whenever I tried to build UI from scratch I'm getting this error adjacent jsx element must be wrapped in an enclosing tag. I don't know how to solve this. Because I tried different methods, I've tried to put the blocks within View component withflex:1 but non-use. Is there any proper solution for this. This is becoming a great challenge for me because I can't design any components of my own. What to do please help me. Following is my code.
screen.js
export default class FirstScreen extends Component {
constructor(props){
super(props);
this.state = {
showPopupDialog: false,
workType: "",
workers: []
}
}
componentWillMount(){
fetch('http://192.168.1.6:3000/api/worker', {
method:'GET',
headers:{
Accept: 'application/json'
}
})
.then(response => response.json())
.then(responseData =>
this.setState({
workers:responseData
})
)
}
onPressYes = (workType) => {
console.log(workType);
}
popupDialog = (id, workType) => {
this.setState ({
showPopupDialog: true,
workType: workType
});
//make sure you set showPopupDialog to false and workType to "" when you click yes or no button in PopupDialog component so that it will work the next time you click on card
}
render() {
const { workers, workType, showPopupDialog} = this.state;
return (
<View style={{flex:1}}>
<Header />
<ScrollView>
{workers.map((a, index)=> (
<View style={{flex:1}}>
<CardSection>
<TouchableOpacity onPress={() => this.popupDialog(a.id, a.work_type)}>
<View style={{ maringTop: 10, marginLeft:120}}>
<Image style={{ height: 100, width: 100 }} source={{ uri: a.work_type == 'Carpenter' ? images[0].image : images[1].image}}/>
<Text style={{marginLeft:20, fontSize:20}}>{a.work_type}</Text>
</View>
</TouchableOpacity>
</CardSection>
</View>
))}
{showPopupDialog && <PopupDialog
dialogStyle={{ backgroundColor: "#FFFFFF", height: 180, width:300, borderWidth:1,padding:10}}
overlayBackgroundColor="#fff" dismissOnTouchOutside={true}>
<View style={styles.dialogContentView}>
<Text style={{fontSize:18, margingTop:10,color:"#000000"}}>Are you sure you want to submit?</Text>
<View style={{flexDirection:'row'}}>
<View style={styles.button_1}>
<Button title="Yes" color="#FF6633" onPress={() => this.onPressYes(workType)}/>
</View>
<View style={styles.button_1}>
<Button title="No" color="#FF6633" onPress={() =>this._onPressNo() }/>
</View>
</View>
</View>
</PopupDialog>}
</ScrollView>
</View>
);
}
}
The issue I'm facing is I can't place the <PopupDialog> component adjacent to <CardSection> , in order to that I put the <PopupDialog> within <View> ,even though it doesn't solve my issue.Please help..Please

Give a try with below corrected code.
There are two things that needs be corrected
You are doing .map but you are not returning anything which I have
corrected in the code below
export default class FirstScreen extends Component {
constructor(props){
super(props);
this.state = {
workType: "",
workers: []
}
}
componentWillMount(){
fetch('http://192.168.1.6:3000/api/worker', {
method:'GET',
headers:{
Accept: 'application/json'
}
})
.then(response => response.json())
.then(responseData =>
this.setState({
workers:responseData
})
)
}
onPressYes = (workType) => {
console.log(workType);
}
popUpDialog = (id, workType) => {
this.setState ({
workType: workType
});
this.popupDialog.show();
//make sure you set workType to "" when you click yes or no button in PopupDialog component so that it will work the next time you click on card
}
render() {
const { workers, workType} = this.state;
return (
<View style={{flex:1}}>
<Header />
<ScrollView>
{workers.map((a, index)=> (
<View style={{flex:1}}>
<CardSection>
<TouchableOpacity onPress={() => this.popUpDialog(a.id, a.work_type)}>
<View style={{ maringTop: 10, marginLeft:120}}>
<Image style={{ height: 100, width: 100 }} source={{ uri: a.work_type == 'Carpenter' ? images[0].image : images[1].image}}/>
<Text style={{marginLeft:20, fontSize:20}}>{a.work_type}</Text>
</View>
</TouchableOpacity>
</CardSection>
</View>
))}
<PopupDialog ref={popupDialog => {
this.popupDialog = popupDialog;
}}
dialogStyle={{ backgroundColor: "#FFFFFF", height: 180, width:300, borderWidth:1,padding:10}}
overlayBackgroundColor="#fff" dismissOnTouchOutside={true}>
<View style={styles.dialogContentView}>
<Text style={{fontSize:18, margingTop:10,color:"#000000"}}>Are you sure you want to submit?</Text>
<View style={{flexDirection:'row'}}>
<View style={styles.button_1}>
<Button title="Yes" color="#FF6633" onPress={() => this.onPressYes(workType)}/>
</View>
<View style={styles.button_1}>
<Button title="No" color="#FF6633" onPress={() =>this._onPressNo() }/>
</View>
</View>
</View>
</PopupDialog>
</ScrollView>
</View>
);
}
}

If I understand your question correctly...
You can return multiple root elements in jsx by wrapping is in a <React.Fragment> element (you can use <> and </> in v16.2 and later). Fragments are new in React v16. Prior to that, you just have to wrap them in some element (a div or span, usually).

The problem is that you have this structure:
<a>
{this.state.workers.map((a, index)=>
<b/>
<c/>
)}
</a>
Since <b/><c/> is parsed separately and there's no enclosing element, you're getting the error. But an enclosing element isn't necessary for the final structure, which does have an enclosing element. The solution is to simply return an array of JSX elements, like this:
<a>
{this.state.workers.map((a, index)=>
[<b/>,
<c/>]
)}
</a>

How do I navigate between List and Item?

I am trying to open an item from my list but my item code is in another js. When I try to use onPress method there is no action. Also I am using Swipeout.
Here is my JobList.js where I am rendering the list of my items.
class JobList extends Component {
onJobDetails = (job) => {
this.props.navigate('JobDetails', job);
}
render() {
const { navigation } = this.props;
var renderJobs = () => {
return this.props.jobs.map((job) => {
return (
<JobItem
key={job._id}
title={job.title}
shortDescription={job.shortDescription}
logo={job.avatar}
company={job.company}
id={job._id}
dispatch={this.props.dispatch}
onPress={() => this.onJobDetails(job)}
/>
)
})
}
return (
<View style={styles.container}>
<ScrollView>
{renderJobs()}
</ScrollView>
</View>
);
}
};
And here is my JobItem.js
class JobItem extends Component {
render() {
return (
<Swipeout {...swipeSettings}>
<View style={styles.jobContainer}>
<View>
<Text style={styles.postTitle}>{this.props.title}</Text>
<Text style={styles.postShortDescription}>{this.props.shortDescription}</Text>
</View>
<View>
<Image
style={styles.postLogo}
source={{uri: '' + this.props.logo + ''}}/>
</View>
</View>
</Swipeout>
)
}
};
Any idea how shall I fix this?

You need to pass onPress prop to the child component in order for it to work.
<Swipeout {...swipeSettings}>
<TouchableWithoutFeedback onPress={this.props.onPress}>
//... other children here
</TouchableWithoutFeedback>
</Swipeout>

How refresh the ListView Component in react native?

I'm trying to create a todo list, then I'm trying to use this checkbox package
react-native-check-box
I don't know if this issue come from that package
when I click the checkbox and click the delete button this is what happen
And here is my code for displaying the list
interface TodoProps{
todo: TodoModel;
ter:string;
}
interface TodoState{
dataSource: any;
myTodo: Array<ITodo>;
}
const ds = new ListView.DataSource({rowHasChanged: (r1, r2) => true});
export default class Todo extends React.Component <TodoProps,TodoState>{
constructor(props:TodoProps) {
super(props);
this.state = {
dataSource: ds.cloneWithRows([]), // or put your initial data here
myTodo: []
};
}
componentWillReceiveProps = (nextProps) => {
console.log(this.state.myTodo);
let data = {
title: nextProps.ter,
isChecked: false
};
let todoList = this.state.myTodo;
if (nextProps.ter) {
todoList.push(data);
}
this.setState({
myTodo: todoList
});
}
onDelete(){
let todos = this.state.myTodo.filter((todo:ITodo) => {
return !todo.isChecked;
});
this.setState({
myTodo: todos
});
}
render() {
let dataSource = this.state.dataSource.cloneWithRows(this.state.myTodo);
return (
<View style={styles.container}>
<View style={styles.box2}>
<ListView enableEmptySections={true} dataSource={dataSource} renderRow={(rowData, sectionID, rowID) => <TodoList data={rowData} onClick={this.onClick.bind(this)} id={rowID} /> } />
</View>
<View style={styles.box3}>
<TouchableOpacity style={styles.bbox1} onPress={()=> alert('weee')}>
<Text style={styles.tabText}>All</Text>
</TouchableOpacity>
<TouchableOpacity style={styles.bbox2} onPress={()=> alert('weee')}>
<Text style={styles.tabText}>Complete</Text>
</TouchableOpacity>
<TouchableOpacity style={styles.bbox3} onPress={()=> alert('weee')}>
<Text style={styles.tabText}>InComplete</Text>
</TouchableOpacity>
<TouchableOpacity style={styles.bbox4} onPress={()=> this.onDestroy()}>
<Text style={styles.tabText}>Delete</Text>
</TouchableOpacity>
</View>
</View>
)
}
}
But if I console log the data. I find all isChecke: to false. Only the view of checkbox is not working. Do I need to use componentwillamount() for this?

Use the below sample code
_onRefresh() {
this.setState({refreshing: true});
// your callback function or call this.componentDidMount()
}
render() {
return (
<ListView
refreshControl={
<RefreshControl
refreshing={this.state.refreshing}
onRefresh={this._onRefresh.bind(this)}
/>
}
...
>
...
</ListView>
);
}

Develop Reference

JavaScript is the programming language of the Web.

React-Native Navigation without render command - javascript

Related

Show Loader when a button is clicked

How to get user id from firebase in react native?

How to avoid jsx styling error in react native?

How do I navigate between List and Item?

How refresh the ListView Component in react native?

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