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Detailed explanation of the case of adding top pull-down refresh and bottom click refresh in React native ListView on mobile terminal
Detailed explanation of the case of adding top pull-down refresh and bottom click refresh in React native ListView on mobile terminal
This time I will bring you a detailed explanation of the case of adding top pull-down refresh and bottom click refresh in React native ListView on the mobile terminal. What are the precautions for adding top pull-down refresh and bottom click refresh in React native ListView on the mobile terminal? Here are Let’s take a look at practical cases.
1. Click refresh at the bottom
1.1 First add a button
render() {
if(!this.state.data){
return(
<Text>Loading... </Text>
)
}else{
return(
<ListView
refreshControl={
<RefreshControl
refreshing = {false}
onRefresh = {this.reloadWordData.bind(this)}
/>
}
dataSource={this.state.data}
renderRow={(rowData)=>this.renderRow(rowData)}
renderFooter={this.renderFooter.bind(this)}
>
</ListView>
);
}
}
renderFooter(){
return (
<View style={{marginVertical: 10, marginBottom:20}} >
<Button
onPress={this.addMoreOnFoot.bind(this)}
title="点击载入更多"
/>
</View>
)
}Add a renderFooter method to ListView to draw the bottom element. Display a button inside.
Button processing logic:
addMoreOnFoot(){
// alert('addMoreOnFoot')
// console.log('addMoreOnFoot')
const url = 'http://127.0.0.1/getFootContent?lastid=' + this.state.footLastId + '&count=20&isTop=0'
fetch(url)
.then((response)=>response.json())
.then((jsondata)=>{
if (jsondata.data && jsondata.data.length > 0){
const rowData = this.state.jsondata.concat(jsondata.data);
this.setState({
footLastId:jsondata.data[jsondata.data.length - 1]['id'],
jsondata:rowData,
data:new ListView.DataSource({rowHasChanged:(r1, r2) => r1 != r2}).cloneWithRows(rowData),
})
}
})
.catch((error)=>{
alert(error);
});
}After clicking, network processing is performed, and the last id is also passed to the server, and the server returns the 20 records after this id. Then resetState.
2. Head pull-down refresh
Add RefeshControl in ListView
render() {
if(!this.state.data){
return(
<Text>Loading... </Text>
)
}else{
return(
<ListView
refreshControl={
<RefreshControl
refreshing = {false}
onRefresh = {this.reloadWordData.bind(this)}
/>
}
dataSource={this.state.data}
renderRow={(rowData)=>this.renderRow(rowData)}
renderFooter={this.renderFooter.bind(this)}
>
</ListView>
);
}
}Load the latest header data and add it to this.State
reloadWordData(){
// alert(this.state.topLastId)
const url = 'http://127.0.0.1/getFootContent?lastid=' + this.state.topLastId + '&count=20&isTop=1'
fetch(url)
.then((response)=>response.json())
.then((jsondata)=>{
if (jsondata.data && jsondata.data.length > 0){
const rowData = jsondata.data.concat(this.state.jsondata);
this.setState({
topLastId:jsondata.data[0]['id'],
jsondata:rowData,
data:new ListView.DataSource({rowHasChanged:(r1, r2) => r1 != r2}).cloneWithRows(rowData),
})
}
})
.catch((error)=>{
alert(error);
});
}I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!
Recommended reading:
Detailed explanation of the steps to implement dynamic and static paging in layui
Detailed explanation of the steps to implement angular routing highlighting
The above is the detailed content of Detailed explanation of the case of adding top pull-down refresh and bottom click refresh in React native ListView on mobile terminal. For more information, please follow other related articles on the PHP Chinese website!
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