Reactjs 反应:当新搜索没有结果时,如何清除以前的结果
我想清除以前的搜索结果,如果没有新搜索的结果。目前,我有一个警告框弹出“无结果”消息。我想同时清除以前搜索的结果 我尝试在else语句中将此.setState({contracts:{}})添加为空,但由于SearchResults组件无法再读取constracts状态,它会使站点崩溃 我还尝试在没有结果的情况下将SearchResults组件的显示更改为null,但这必须要起作用 如果没有结果,是否有方法将contracts状态添加到componentWillUnmount 搜索结果组件Reactjs 反应:当新搜索没有结果时,如何清除以前的结果,reactjs,Reactjs,我想清除以前的搜索结果,如果没有新搜索的结果。目前,我有一个警告框弹出“无结果”消息。我想同时清除以前搜索的结果 我尝试在else语句中将此.setState({contracts:{}})添加为空,但由于SearchResults组件无法再读取constracts状态,它会使站点崩溃 我还尝试在没有结果的情况下将SearchResults组件的显示更改为null,但这必须要起作用 如果没有结果,是否有方法将contracts状态添加到componentWillUnmount 搜索结果组件 co
const SearchResults = props => (
<div>{console.log(props)}
<div>
</div>
<div>
<div className="row" ><h4 style={{margin:"auto", marginBottom:"15px"}}>Search Results</h4></div>
<table className="table table-striped">
<thead>
<tr>
{props.labels.map(label => ( <th key={label.Id}>{label.DisplayName}</th>))}
</tr>
</thead>
<tbody>
{ props.contracts.map((contract, i) => (
<tr key={i} data-id={contract.Id}
onClick={(e) => {props.handleContract(contract.Fields.filter(field => field.DataField === "IDXT001").map(field => field.DataValue))}}
className="clickable-row"
target="_blank"
>
{contract.Fields.map( docs =>
<td key={docs.Id}><span id={docs.DataField}>{docs.DataValue}</span></td>)}
</tr>))}
</tbody>
</table>
</div>
</div>
)
class SearchForm extends React.Component {
constructor(...args) {
super(...args);
this.state = {
modalShow: false,
};
}
render() {
return (
<form className="form-inline col-md-12" onReset={this.props.handleFormReset}>
{this.props.labels.map(label => (
<div className="card border-0 mx-auto" style={styles} key={label.Id}>
<ul className="list-inline ">
<span>
<li>
<Labels htmlFor={label.DisplayName} >{label.DisplayName}:</Labels>
</li>
<li >
<Input
key={label.Id}
onChange={(e) => {
this.props.handleInputChange(label.DataField, e.target.value)}}
value={this.props.newFormValues}
maxLength="999"
style={{height:34}}
name="value"
type="search"
className={"form-control mb-2 mr-sm-2"}
id={label.DataField}
/>
</li>
</span>
</ul>
</div>
))}
<div className=" col-sm-12">
<Button
style={{ float: "left", marginBottom: 10 }}
className="btn btn-success"
type="submit"
onClick={this.props.handleFormSubmit}
>
Search
</Button>
<Help />
<Button
style={{ float: "left", marginBottom: 10 }}
className="btn btn-secondary"
type="reset"
onClick={this.props.handleFormReset}
>
Reset
</Button>
class SearchPage extends React.Component {
constructor(props) {
super(props);
this.state = {
labels: [],
contracts: [],
formValues:{},
pdfs:[],
titles:[],
show: false,
};
this.onClick = this.handleContract.bind(this);
this.handleShow = this.handleShow.bind(this);
this.handleClose = this.handleClose.bind(this);
}
initialState = {
formValues: {},
}
componentDidMount(){
this.loadLabels();
}
handleFormReset = () => {
this.setState(() => this.initialState)
console.log("value is"+JSON.stringify(this.state.formValues))
}
handleClose() {
this.setState({ show: false });
}
handleShow() {
this.setState({ show: true });
}
loadLabels = () => {
API.getLabels()
.then(res => {
const labels = res.data;
console.log(labels)
this.setState({ labels })
})
.catch(err => console.log(err));
};
handleInputChange = (key, value) => {
const newFormValues = Object.assign({}, this.state.formValues, {[key]: value});
this.setState({ formValues: newFormValues })
};
handleContract = (id) => {
API.openRow(id)
.then(res => {
const pdfs = res.data;
this.setState({pdfs});
this.props.history.push({
state: { labels:this.state.labels,
pdfs:this.state.pdfs,
titles:this.state.titles }
})
})
.catch(err => console.log(err));
API.titles(id)
.then(res => {
const titles = res.data;
this.setState({titles});
})
this.setState({ show: true });
}
loadContracts = (query) => {
API.search(query)
.then(res => {
const contracts = res.data;
if (contracts.length > 0 )
this.setState({ contracts });
else
return alert("No results")
this.handleFormReset();
})
.catch(err => console.log(err));
};
handleFormSubmit = event => {
event.preventDefault();
const formData = this.state.formValues
let query = '';
let keys = Object.keys(formData);
keys.map(k => {
if (query !== "")
query += `&`;
query += `filter=`
query += `${k}|${formData[k]}`
this.loadContracts(query);
})
};
<SearchForm
labels={this.state.labels}
handleFormSubmit={this.handleFormSubmit}
handleInputChange={this.handleInputChange}
handleReset={this.handleReset}
handleFormReset={this.handleFormReset}
/>
<br/>
<SearchResults
labels={this.state.labels}
contracts={this.state.contracts}
pdfs={this.state.pdfs}
handleContract={this.onClick}
handleTitles={this.onClick}
/>
const SearchResults=props=>(
{console.log(props)}
搜索结果
{props.labels.map(label=>({label.DisplayName}))}
{props.contracts.map((contract,i)=>(
{props.handleContract(contract.Fields.filter(field=>field.DataField==“IDXT001”).map(field=>field.DataValue))}
className=“可单击行”
target=“\u blank”
>
{contract.Fields.map(docs=>
{docs.DataValue}}
))}
)
搜索表单组件
const SearchResults = props => (
<div>{console.log(props)}
<div>
</div>
<div>
<div className="row" ><h4 style={{margin:"auto", marginBottom:"15px"}}>Search Results</h4></div>
<table className="table table-striped">
<thead>
<tr>
{props.labels.map(label => ( <th key={label.Id}>{label.DisplayName}</th>))}
</tr>
</thead>
<tbody>
{ props.contracts.map((contract, i) => (
<tr key={i} data-id={contract.Id}
onClick={(e) => {props.handleContract(contract.Fields.filter(field => field.DataField === "IDXT001").map(field => field.DataValue))}}
className="clickable-row"
target="_blank"
>
{contract.Fields.map( docs =>
<td key={docs.Id}><span id={docs.DataField}>{docs.DataValue}</span></td>)}
</tr>))}
</tbody>
</table>
</div>
</div>
)
class SearchForm extends React.Component {
constructor(...args) {
super(...args);
this.state = {
modalShow: false,
};
}
render() {
return (
<form className="form-inline col-md-12" onReset={this.props.handleFormReset}>
{this.props.labels.map(label => (
<div className="card border-0 mx-auto" style={styles} key={label.Id}>
<ul className="list-inline ">
<span>
<li>
<Labels htmlFor={label.DisplayName} >{label.DisplayName}:</Labels>
</li>
<li >
<Input
key={label.Id}
onChange={(e) => {
this.props.handleInputChange(label.DataField, e.target.value)}}
value={this.props.newFormValues}
maxLength="999"
style={{height:34}}
name="value"
type="search"
className={"form-control mb-2 mr-sm-2"}
id={label.DataField}
/>
</li>
</span>
</ul>
</div>
))}
<div className=" col-sm-12">
<Button
style={{ float: "left", marginBottom: 10 }}
className="btn btn-success"
type="submit"
onClick={this.props.handleFormSubmit}
>
Search
</Button>
<Help />
<Button
style={{ float: "left", marginBottom: 10 }}
className="btn btn-secondary"
type="reset"
onClick={this.props.handleFormReset}
>
Reset
</Button>
class SearchPage extends React.Component {
constructor(props) {
super(props);
this.state = {
labels: [],
contracts: [],
formValues:{},
pdfs:[],
titles:[],
show: false,
};
this.onClick = this.handleContract.bind(this);
this.handleShow = this.handleShow.bind(this);
this.handleClose = this.handleClose.bind(this);
}
initialState = {
formValues: {},
}
componentDidMount(){
this.loadLabels();
}
handleFormReset = () => {
this.setState(() => this.initialState)
console.log("value is"+JSON.stringify(this.state.formValues))
}
handleClose() {
this.setState({ show: false });
}
handleShow() {
this.setState({ show: true });
}
loadLabels = () => {
API.getLabels()
.then(res => {
const labels = res.data;
console.log(labels)
this.setState({ labels })
})
.catch(err => console.log(err));
};
handleInputChange = (key, value) => {
const newFormValues = Object.assign({}, this.state.formValues, {[key]: value});
this.setState({ formValues: newFormValues })
};
handleContract = (id) => {
API.openRow(id)
.then(res => {
const pdfs = res.data;
this.setState({pdfs});
this.props.history.push({
state: { labels:this.state.labels,
pdfs:this.state.pdfs,
titles:this.state.titles }
})
})
.catch(err => console.log(err));
API.titles(id)
.then(res => {
const titles = res.data;
this.setState({titles});
})
this.setState({ show: true });
}
loadContracts = (query) => {
API.search(query)
.then(res => {
const contracts = res.data;
if (contracts.length > 0 )
this.setState({ contracts });
else
return alert("No results")
this.handleFormReset();
})
.catch(err => console.log(err));
};
handleFormSubmit = event => {
event.preventDefault();
const formData = this.state.formValues
let query = '';
let keys = Object.keys(formData);
keys.map(k => {
if (query !== "")
query += `&`;
query += `filter=`
query += `${k}|${formData[k]}`
this.loadContracts(query);
})
};
<SearchForm
labels={this.state.labels}
handleFormSubmit={this.handleFormSubmit}
handleInputChange={this.handleInputChange}
handleReset={this.handleReset}
handleFormReset={this.handleFormReset}
/>
<br/>
<SearchResults
labels={this.state.labels}
contracts={this.state.contracts}
pdfs={this.state.pdfs}
handleContract={this.onClick}
handleTitles={this.onClick}
/>
类SearchForm扩展了React.Component{
构造函数(…参数){
超级(…args);
this.state={
莫达尔肖:错,
};
}
render(){
报税表(
{this.props.labels.map(label=>(
-
{label.DisplayName}:
-
{
this.props.handleInputChange(label.DataField,e.target.value)}
value={this.props.newFormValues}
maxLength=“999”
样式={{高度:34}}
name=“value”
type=“搜索”
className={“表单控件mb-2 mr-sm-2”}
id={label.DataField}
/>
))}
搜寻
重置
父组件
const SearchResults = props => (
<div>{console.log(props)}
<div>
</div>
<div>
<div className="row" ><h4 style={{margin:"auto", marginBottom:"15px"}}>Search Results</h4></div>
<table className="table table-striped">
<thead>
<tr>
{props.labels.map(label => ( <th key={label.Id}>{label.DisplayName}</th>))}
</tr>
</thead>
<tbody>
{ props.contracts.map((contract, i) => (
<tr key={i} data-id={contract.Id}
onClick={(e) => {props.handleContract(contract.Fields.filter(field => field.DataField === "IDXT001").map(field => field.DataValue))}}
className="clickable-row"
target="_blank"
>
{contract.Fields.map( docs =>
<td key={docs.Id}><span id={docs.DataField}>{docs.DataValue}</span></td>)}
</tr>))}
</tbody>
</table>
</div>
</div>
)
class SearchForm extends React.Component {
constructor(...args) {
super(...args);
this.state = {
modalShow: false,
};
}
render() {
return (
<form className="form-inline col-md-12" onReset={this.props.handleFormReset}>
{this.props.labels.map(label => (
<div className="card border-0 mx-auto" style={styles} key={label.Id}>
<ul className="list-inline ">
<span>
<li>
<Labels htmlFor={label.DisplayName} >{label.DisplayName}:</Labels>
</li>
<li >
<Input
key={label.Id}
onChange={(e) => {
this.props.handleInputChange(label.DataField, e.target.value)}}
value={this.props.newFormValues}
maxLength="999"
style={{height:34}}
name="value"
type="search"
className={"form-control mb-2 mr-sm-2"}
id={label.DataField}
/>
</li>
</span>
</ul>
</div>
))}
<div className=" col-sm-12">
<Button
style={{ float: "left", marginBottom: 10 }}
className="btn btn-success"
type="submit"
onClick={this.props.handleFormSubmit}
>
Search
</Button>
<Help />
<Button
style={{ float: "left", marginBottom: 10 }}
className="btn btn-secondary"
type="reset"
onClick={this.props.handleFormReset}
>
Reset
</Button>
class SearchPage extends React.Component {
constructor(props) {
super(props);
this.state = {
labels: [],
contracts: [],
formValues:{},
pdfs:[],
titles:[],
show: false,
};
this.onClick = this.handleContract.bind(this);
this.handleShow = this.handleShow.bind(this);
this.handleClose = this.handleClose.bind(this);
}
initialState = {
formValues: {},
}
componentDidMount(){
this.loadLabels();
}
handleFormReset = () => {
this.setState(() => this.initialState)
console.log("value is"+JSON.stringify(this.state.formValues))
}
handleClose() {
this.setState({ show: false });
}
handleShow() {
this.setState({ show: true });
}
loadLabels = () => {
API.getLabels()
.then(res => {
const labels = res.data;
console.log(labels)
this.setState({ labels })
})
.catch(err => console.log(err));
};
handleInputChange = (key, value) => {
const newFormValues = Object.assign({}, this.state.formValues, {[key]: value});
this.setState({ formValues: newFormValues })
};
handleContract = (id) => {
API.openRow(id)
.then(res => {
const pdfs = res.data;
this.setState({pdfs});
this.props.history.push({
state: { labels:this.state.labels,
pdfs:this.state.pdfs,
titles:this.state.titles }
})
})
.catch(err => console.log(err));
API.titles(id)
.then(res => {
const titles = res.data;
this.setState({titles});
})
this.setState({ show: true });
}
loadContracts = (query) => {
API.search(query)
.then(res => {
const contracts = res.data;
if (contracts.length > 0 )
this.setState({ contracts });
else
return alert("No results")
this.handleFormReset();
})
.catch(err => console.log(err));
};
handleFormSubmit = event => {
event.preventDefault();
const formData = this.state.formValues
let query = '';
let keys = Object.keys(formData);
keys.map(k => {
if (query !== "")
query += `&`;
query += `filter=`
query += `${k}|${formData[k]}`
this.loadContracts(query);
})
};
<SearchForm
labels={this.state.labels}
handleFormSubmit={this.handleFormSubmit}
handleInputChange={this.handleInputChange}
handleReset={this.handleReset}
handleFormReset={this.handleFormReset}
/>
<br/>
<SearchResults
labels={this.state.labels}
contracts={this.state.contracts}
pdfs={this.state.pdfs}
handleContract={this.onClick}
handleTitles={this.onClick}
/>
class SearchPage扩展了React.Component{
建造师(道具){
超级(道具);
此.state={
标签:[],
合同:[],
formValues:{},
PDF:[],
标题:[],
秀:假,,
};
this.onClick=this.handleContract.bind(this);
this.handleShow=this.handleShow.bind(this);
this.handleClose=this.handleClose.bind(this);
}
initialState={
formValues:{},
}
componentDidMount(){
这是loadLabels();
}
handleFormReset=()=>{
this.setState(()=>this.initialState)
log(“值为”+JSON.stringify(this.state.formValues))
}
handleClose(){
this.setState({show:false});
}
handleShow(){
this.setState({show:true});
}
loadLabels=()=>{
API.getLabels()
。然后(res=>{
常量标签=分辨率数据;
console.log(标签)
this.setState({labels})
})
.catch(err=>console.log(err));
};
handleInputChange=(键,值)=>{
const newFormValues=Object.assign({},this.state.formValues,{[key]:value});
this.setState({formValues:newFormValues})
};
handleContract=(id)=>{
API.openRow(id)
。然后(res=>{
常数pdfs=分辨率数据;
this.setState({pdfs});
这个。道具。历史。推({
状态:{labels:this.state.labels,
pdfs:this.state.pdfs,
标题:this.state.titles}
})
})
.catch(err=>console.log(err));
API.标题(id)
。然后(res=>{
常量标题=资源数据;
this.setState({titles});
})
this.setState({show:true});
}
loadContracts=(查询)=>{
API.search(查询)
。然后(res=>{
const contracts=res.data;
如果(合同长度>0)
this.setState({contracts});
其他的
返回警报(“无结果”)
此.handleFormReset();
})
.catch(err=>console.log(err));
};
handleFormSubmit=事件=>{
event.preventDefault();
const formData=this.state.formValues
让query='';
让keys=Object.keys(formData);
keys.map(k=>{
如果(查询!==“”)
查询+=`&`;
查询+=`过滤器=`
query+=`${k}|${formData[k]}`
这是loadContracts(查询);
})
};
很难说没有看到组件崩溃,但是在案例中将契约设置为空数组可能会阻止组件崩溃
this.setState({contracts:[]})
假设搜索结果是一个对象数组,您可以将契约设置为空数组,而不是设置为空对象。
this.searchResults=[]不清楚组件的结构和状态处理方式。能否添加更多信息?向问题添加了更多代码这是正确的格式吗?否则返回警报(“无结果”)this.setState({contracts:[]})这样就根本无法显示结果。即使有搜索结果。我认为This.handleFormReset();
正在将状态设置回空结果,即使有搜索结果。This.handleFormReset()的;将formValues状态重置为空。这将清除下一次搜索的输入。确定。如果我替换了警报框,它将正常工作。使用此.setState({contracts:[])).我有个大脑屁。我怎么能用这个语句得到警报?我要把它添加到我的else语句中吗?我在那里添加了它,但以前的结果仍然存在。是的。你必须放入else块。你添加了这个.setState({contracts:[])吗?是的,我让它工作了