how i can check condition inside navigationOptions in react native
0
I want to set a custom navigation headerLeft property;How i can set the headerLeft property only if the condition is satisfied.otherwise not.I use a StackNavigator in my app. and also cannot access props from inside navigationOptions.
here is my code
componentDidMount() {
this.props.navigation.setParams({goBack: this.goBack, shouldShow: this.state.show });
}
onShow = () => {
if (this.state.steps >1) {
this.setState({show:true}, () => {this.props.navigation.setParam({shouldShow:true})} )
}
}
goBack= () =>{
this.setState({ steps: this.state.steps - 1 })
}
static navigationOptions = ({ navigation }) => {
const { params = {} } = navigation.state;
let headerLeft = null;
if (params.shouldShow) {
headerLeft = <TouchableOpacity onPress={() => params.goBack}>
<Image source={/* src */} style={Styles.navBarIcon} />
</TouchableOpacity>
}
return {
headerLeft: headerLeft,
headerTitle: 'Register',
headerStyle: Styles.navBar,
};
};
react-native
asked Nov 20 at 7:09
Fahad
168
add a comment |
0
I want to set a custom navigation headerLeft property;How i can set the headerLeft property only if the condition is satisfied.otherwise not.I use a StackNavigator in my app. and also cannot access props from inside navigationOptions.
here is my code
componentDidMount() {
this.props.navigation.setParams({goBack: this.goBack, shouldShow: this.state.show });
}
onShow = () => {
if (this.state.steps >1) {
this.setState({show:true}, () => {this.props.navigation.setParam({shouldShow:true})} )
}
}
goBack= () =>{
this.setState({ steps: this.state.steps - 1 })
}
static navigationOptions = ({ navigation }) => {
const { params = {} } = navigation.state;
let headerLeft = null;
if (params.shouldShow) {
headerLeft = <TouchableOpacity onPress={() => params.goBack}>
<Image source={/* src */} style={Styles.navBarIcon} />
</TouchableOpacity>
}
return {
headerLeft: headerLeft,
headerTitle: 'Register',
headerStyle: Styles.navBar,
};
};
react-native
asked Nov 20 at 7:09
Fahad
168
add a comment |
0
0
0
I want to set a custom navigation headerLeft property;How i can set the headerLeft property only if the condition is satisfied.otherwise not.I use a StackNavigator in my app. and also cannot access props from inside navigationOptions.
here is my code
componentDidMount() {
this.props.navigation.setParams({goBack: this.goBack, shouldShow: this.state.show });
}
onShow = () => {
if (this.state.steps >1) {
this.setState({show:true}, () => {this.props.navigation.setParam({shouldShow:true})} )
}
}
goBack= () =>{
this.setState({ steps: this.state.steps - 1 })
}
static navigationOptions = ({ navigation }) => {
const { params = {} } = navigation.state;
let headerLeft = null;
if (params.shouldShow) {
headerLeft = <TouchableOpacity onPress={() => params.goBack}>
<Image source={/* src */} style={Styles.navBarIcon} />
</TouchableOpacity>
}
return {
headerLeft: headerLeft,
headerTitle: 'Register',
headerStyle: Styles.navBar,
};
};
react-native
asked Nov 20 at 7:09
Fahad
168
I want to set a custom navigation headerLeft property;How i can set the headerLeft property only if the condition is satisfied.otherwise not.I use a StackNavigator in my app. and also cannot access props from inside navigationOptions.
here is my code
componentDidMount() {
this.props.navigation.setParams({goBack: this.goBack, shouldShow: this.state.show });
}
onShow = () => {
if (this.state.steps >1) {
this.setState({show:true}, () => {this.props.navigation.setParam({shouldShow:true})} )
}
}
goBack= () =>{
this.setState({ steps: this.state.steps - 1 })
}
static navigationOptions = ({ navigation }) => {
const { params = {} } = navigation.state;
let headerLeft = null;
if (params.shouldShow) {
headerLeft = <TouchableOpacity onPress={() => params.goBack}>
<Image source={/* src */} style={Styles.navBarIcon} />
</TouchableOpacity>
}
return {
headerLeft: headerLeft,
headerTitle: 'Register',
headerStyle: Styles.navBar,
};
};
react-native
react-native
asked Nov 20 at 7:09
Fahad
168
asked Nov 20 at 7:09
Fahad
168
edited Nov 23 at 4:12
asked Nov 20 at 7:09
Fahad
168
asked Nov 20 at 7:09
Fahad
168
asked Nov 20 at 7:09
Fahad
168
168
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
1
Since navigation options are static and not included inside your class, you cannot simply access states inside it. But you can follow below method.
// ------ inside your class -------
static navigationOptions = ({ navigation }) => {
const { params = {} } = navigation.state;
let headerLeft = null;
if(params.shouldShow) {
headerLeft = <TouchableOpacity onPress={() => params.onPressButton()}>
<Image source={/* source */} style={Styles.navBarIcon} />
</TouchableOpacity>
}
return {
headerLeft: headerLeft
};
};
componentDidMount(){
this.props.navigation.setParams({ onPressButton: this.onButtonPressedEvent, shouldShow:this.state.show });
}
onButtonPressedEvent = () =>{
// What you want to do when button pressed.
}
onShow = () =>{
if(this.state.count > 1){
this.setState({show:true}, () => {this.props.navigation.setParam({shouldShow:true})} )
}
}
Remember to call onShow method when you change the count to make changes in navigation.
answered Nov 20 at 8:14
Samitha Nanayakkara
1,351315
replaced count by steps and remove the onButtonPressedEvent; tried with this and it doesn't worked
– Fahad
Nov 20 at 11:50
Can you please update your question with new code? Then I can inspect it.
– Samitha Nanayakkara
Nov 20 at 11:58
componentDidMount() { this.props.navigation.setParams({ shouldShow: this.state.show }); }
– Fahad
Nov 20 at 12:19
onShow = () => { alert(this.state.steps); if (this.state.steps >1) { this.setState({ show: true }, () => { this.props.navigation.setParam({ show: true }) }) } }
– Fahad
Nov 20 at 12:23
static navigationOptions = ({ navigation }) => { const { params = {} } = navigation.state; let headerLeft = null; if (params.shouldShow) { headerLeft = <TouchableOpacity onPress={() => params.onPressButton}> <Image source={/* source*/} style={Styles.navBarIcon} /> </TouchableOpacity> } return { headerLeft: headerLeft, headerTitle: 'Register', headerStyle: Styles.navBar, }; };
– Fahad
Nov 20 at 12:24
|
show 7 more comments
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1 Answer
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oldest
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oldest
votes
1
Since navigation options are static and not included inside your class, you cannot simply access states inside it. But you can follow below method.
// ------ inside your class -------
static navigationOptions = ({ navigation }) => {
const { params = {} } = navigation.state;
let headerLeft = null;
if(params.shouldShow) {
headerLeft = <TouchableOpacity onPress={() => params.onPressButton()}>
<Image source={/* source */} style={Styles.navBarIcon} />
</TouchableOpacity>
}
return {
headerLeft: headerLeft
};
};
componentDidMount(){
this.props.navigation.setParams({ onPressButton: this.onButtonPressedEvent, shouldShow:this.state.show });
}
onButtonPressedEvent = () =>{
// What you want to do when button pressed.
}
onShow = () =>{
if(this.state.count > 1){
this.setState({show:true}, () => {this.props.navigation.setParam({shouldShow:true})} )
}
}
Remember to call onShow method when you change the count to make changes in navigation.
answered Nov 20 at 8:14
Samitha Nanayakkara
1,351315
replaced count by steps and remove the onButtonPressedEvent; tried with this and it doesn't worked
– Fahad
Nov 20 at 11:50
Can you please update your question with new code? Then I can inspect it.
– Samitha Nanayakkara
Nov 20 at 11:58
componentDidMount() { this.props.navigation.setParams({ shouldShow: this.state.show }); }
– Fahad
Nov 20 at 12:19
onShow = () => { alert(this.state.steps); if (this.state.steps >1) { this.setState({ show: true }, () => { this.props.navigation.setParam({ show: true }) }) } }
– Fahad
Nov 20 at 12:23
static navigationOptions = ({ navigation }) => { const { params = {} } = navigation.state; let headerLeft = null; if (params.shouldShow) { headerLeft = <TouchableOpacity onPress={() => params.onPressButton}> <Image source={/* source*/} style={Styles.navBarIcon} /> </TouchableOpacity> } return { headerLeft: headerLeft, headerTitle: 'Register', headerStyle: Styles.navBar, }; };
– Fahad
Nov 20 at 12:24
|
show 7 more comments
1
Since navigation options are static and not included inside your class, you cannot simply access states inside it. But you can follow below method.
// ------ inside your class -------
static navigationOptions = ({ navigation }) => {
const { params = {} } = navigation.state;
let headerLeft = null;
if(params.shouldShow) {
headerLeft = <TouchableOpacity onPress={() => params.onPressButton()}>
<Image source={/* source */} style={Styles.navBarIcon} />
</TouchableOpacity>
}
return {
headerLeft: headerLeft
};
};
componentDidMount(){
this.props.navigation.setParams({ onPressButton: this.onButtonPressedEvent, shouldShow:this.state.show });
}
onButtonPressedEvent = () =>{
// What you want to do when button pressed.
}
onShow = () =>{
if(this.state.count > 1){
this.setState({show:true}, () => {this.props.navigation.setParam({shouldShow:true})} )
}
}
Remember to call onShow method when you change the count to make changes in navigation.
answered Nov 20 at 8:14
Samitha Nanayakkara
1,351315
replaced count by steps and remove the onButtonPressedEvent; tried with this and it doesn't worked
– Fahad
Nov 20 at 11:50
Can you please update your question with new code? Then I can inspect it.
– Samitha Nanayakkara
Nov 20 at 11:58
componentDidMount() { this.props.navigation.setParams({ shouldShow: this.state.show }); }
– Fahad
Nov 20 at 12:19
onShow = () => { alert(this.state.steps); if (this.state.steps >1) { this.setState({ show: true }, () => { this.props.navigation.setParam({ show: true }) }) } }
– Fahad
Nov 20 at 12:23
static navigationOptions = ({ navigation }) => { const { params = {} } = navigation.state; let headerLeft = null; if (params.shouldShow) { headerLeft = <TouchableOpacity onPress={() => params.onPressButton}> <Image source={/* source*/} style={Styles.navBarIcon} /> </TouchableOpacity> } return { headerLeft: headerLeft, headerTitle: 'Register', headerStyle: Styles.navBar, }; };
– Fahad
Nov 20 at 12:24
|
show 7 more comments
1
1
1
Since navigation options are static and not included inside your class, you cannot simply access states inside it. But you can follow below method.
// ------ inside your class -------
static navigationOptions = ({ navigation }) => {
const { params = {} } = navigation.state;
let headerLeft = null;
if(params.shouldShow) {
headerLeft = <TouchableOpacity onPress={() => params.onPressButton()}>
<Image source={/* source */} style={Styles.navBarIcon} />
</TouchableOpacity>
}
return {
headerLeft: headerLeft
};
};
componentDidMount(){
this.props.navigation.setParams({ onPressButton: this.onButtonPressedEvent, shouldShow:this.state.show });
}
onButtonPressedEvent = () =>{
// What you want to do when button pressed.
}
onShow = () =>{
if(this.state.count > 1){
this.setState({show:true}, () => {this.props.navigation.setParam({shouldShow:true})} )
}
}
Remember to call onShow method when you change the count to make changes in navigation.
answered Nov 20 at 8:14
Samitha Nanayakkara
1,351315
Since navigation options are static and not included inside your class, you cannot simply access states inside it. But you can follow below method.
// ------ inside your class -------
static navigationOptions = ({ navigation }) => {
const { params = {} } = navigation.state;
let headerLeft = null;
if(params.shouldShow) {
headerLeft = <TouchableOpacity onPress={() => params.onPressButton()}>
<Image source={/* source */} style={Styles.navBarIcon} />
</TouchableOpacity>
}
return {
headerLeft: headerLeft
};
};
componentDidMount(){
this.props.navigation.setParams({ onPressButton: this.onButtonPressedEvent, shouldShow:this.state.show });
}
onButtonPressedEvent = () =>{
// What you want to do when button pressed.
}
onShow = () =>{
if(this.state.count > 1){
this.setState({show:true}, () => {this.props.navigation.setParam({shouldShow:true})} )
}
}
Remember to call onShow method when you change the count to make changes in navigation.
answered Nov 20 at 8:14
Samitha Nanayakkara
1,351315
edited Nov 22 at 7:48
answered Nov 20 at 8:14
Samitha Nanayakkara
1,351315
answered Nov 20 at 8:14
Samitha Nanayakkara
1,351315
answered Nov 20 at 8:14
Samitha Nanayakkara
1,351315
1,351315
replaced count by steps and remove the onButtonPressedEvent; tried with this and it doesn't worked
– Fahad
Nov 20 at 11:50
Can you please update your question with new code? Then I can inspect it.
– Samitha Nanayakkara
Nov 20 at 11:58
componentDidMount() { this.props.navigation.setParams({ shouldShow: this.state.show }); }
– Fahad
Nov 20 at 12:19
onShow = () => { alert(this.state.steps); if (this.state.steps >1) { this.setState({ show: true }, () => { this.props.navigation.setParam({ show: true }) }) } }
– Fahad
Nov 20 at 12:23
static navigationOptions = ({ navigation }) => { const { params = {} } = navigation.state; let headerLeft = null; if (params.shouldShow) { headerLeft = <TouchableOpacity onPress={() => params.onPressButton}> <Image source={/* source*/} style={Styles.navBarIcon} /> </TouchableOpacity> } return { headerLeft: headerLeft, headerTitle: 'Register', headerStyle: Styles.navBar, }; };
– Fahad
Nov 20 at 12:24
|
show 7 more comments
replaced count by steps and remove the onButtonPressedEvent; tried with this and it doesn't worked
– Fahad
Nov 20 at 11:50
Can you please update your question with new code? Then I can inspect it.
– Samitha Nanayakkara
Nov 20 at 11:58
componentDidMount() { this.props.navigation.setParams({ shouldShow: this.state.show }); }
– Fahad
Nov 20 at 12:19
onShow = () => { alert(this.state.steps); if (this.state.steps >1) { this.setState({ show: true }, () => { this.props.navigation.setParam({ show: true }) }) } }
– Fahad
Nov 20 at 12:23
static navigationOptions = ({ navigation }) => { const { params = {} } = navigation.state; let headerLeft = null; if (params.shouldShow) { headerLeft = <TouchableOpacity onPress={() => params.onPressButton}> <Image source={/* source*/} style={Styles.navBarIcon} /> </TouchableOpacity> } return { headerLeft: headerLeft, headerTitle: 'Register', headerStyle: Styles.navBar, }; };
– Fahad
Nov 20 at 12:24
replaced count by steps and remove the onButtonPressedEvent; tried with this and it doesn't worked
– Fahad
Nov 20 at 11:50
replaced count by steps and remove the onButtonPressedEvent; tried with this and it doesn't worked
– Fahad
Nov 20 at 11:50
Can you please update your question with new code? Then I can inspect it.
– Samitha Nanayakkara
Nov 20 at 11:58
Can you please update your question with new code? Then I can inspect it.
– Samitha Nanayakkara
Nov 20 at 11:58
componentDidMount() { this.props.navigation.setParams({ shouldShow: this.state.show }); }
– Fahad
Nov 20 at 12:19
componentDidMount() { this.props.navigation.setParams({ shouldShow: this.state.show }); }
– Fahad
Nov 20 at 12:19
onShow = () => { alert(this.state.steps); if (this.state.steps >1) { this.setState({ show: true }, () => { this.props.navigation.setParam({ show: true }) }) } }
– Fahad
Nov 20 at 12:23
onShow = () => { alert(this.state.steps); if (this.state.steps >1) { this.setState({ show: true }, () => { this.props.navigation.setParam({ show: true }) }) } }
– Fahad
Nov 20 at 12:23
static navigationOptions = ({ navigation }) => { const { params = {} } = navigation.state; let headerLeft = null; if (params.shouldShow) { headerLeft = <TouchableOpacity onPress={() => params.onPressButton}> <Image source={/* source*/} style={Styles.navBarIcon} /> </TouchableOpacity> } return { headerLeft: headerLeft, headerTitle: 'Register', headerStyle: Styles.navBar, }; };
– Fahad
Nov 20 at 12:24
static navigationOptions = ({ navigation }) => { const { params = {} } = navigation.state; let headerLeft = null; if (params.shouldShow) { headerLeft = <TouchableOpacity onPress={() => params.onPressButton}> <Image source={/* source*/} style={Styles.navBarIcon} /> </TouchableOpacity> } return { headerLeft: headerLeft, headerTitle: 'Register', headerStyle: Styles.navBar, }; };
– Fahad
Nov 20 at 12:24
|
show 7 more comments
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