I am creating a bar with two dropdown. The second dropdown depends of the selection from the first dropdown. I have 3 Components : 1. Dropdown Bar : Contains FirstDropdown and Second Dropdown 2. FirstDropdown 3. SecondDropdown
Trying to pass State -> Practice that appears in the FirstDropdown Component as props to SecondDropdown Component. Clearly I'm not doing this correctly. Any Help will be appreciate. Thank you in advance!
class DropdownBar extends React.Component {
constructor(props) {
super(props);
}
render () {
return (
<div>
<div className="top-bar">
<Row>
<div style={{marginTop: 15, marginBottom:15}}>
<Col span={8}><FirstDropdown practice={this.props.practice} /></Col>
<Col span={8}><SecondDropdown /></Col>
</div>
</Row>
</div>
</div>
)
}
class FirstDropdown extends React.Component {
constructor() {
super();
this.state = {
practices: [
name = 'Jon',
name = 'potato',
name = 'stark',
],
practice: 'stark'
}
}
onChangePractice(value) {
console.log(`selected ${value}`);
this.setState({
practice: value
})
}
render () {
const {practices} = this.state
return (
<div>
<Row>
<div className="First-dropdown">
<Col span={8}><div className="dropdown-title">Research: </div></Col>
<Col span={14}>
<Select
showSearch
style={{ width: '100%' }}
placeholder="Select a Something"
optionFilterProp="children"
onChange={this.onChangePractice.bind(this)}
onFocus={onFocus}
onBlur={onBlur}
onSearch={onSearch}
filterOption={(input, option) =>
option.props.children.toLowerCase().indexOf(input.toLowerCase()) >= 0
}
>
{practices.map(practice => (
<Option
value={practice}
key={practice}
data-automation={practice.name}
>{practice}</Option>
))}
</Select>
</Col>
</div>
</Row>
</div>
)
}
class SecondDropdown extends React.Component {
constructor(props) {
super(props);
this.state = {
modules: [
name = 'Drogon',
name = 'Rhaegal',
name = 'Viserion',
]
}
}
ponentDidUpdate(prevProps) {
console.log(this.props.practice)
if (!equal(this.props.practice, prevProps.practice))
{
this.updatePractice();
}
}
render () {
const {modules} = this.state
console.log(this.props.practice )
let practice = this.props.practice;
if (practice === 'stark') {
return (
<div>
<Row>
<div className="benchmark-dropdown">
<Col span={4}><div className="dropdown-title">Module: </div></Col>
<Col span={16}>
<Select
showSearch
style={{ width: '100%' }}
placeholder="Select Something"
optionFilterProp="children"
onChange={onChange}
onFocus={onFocus}
onBlur={onBlur}
onSearch={onSearch}
filterOption={(input, option) =>
option.props.children.toLowerCase().indexOf(input.toLowerCase()) >= 0
}
>
{modules.map(item => (
<Option
value={item}
key={item}
>{item}</Option>
))}
</Select>
</Col>
</div>
</Row>
</div>
)
} else {
return <div> NOOOOO </div>
}
}
I am creating a bar with two dropdown. The second dropdown depends of the selection from the first dropdown. I have 3 Components : 1. Dropdown Bar : Contains FirstDropdown and Second Dropdown 2. FirstDropdown 3. SecondDropdown
Trying to pass State -> Practice that appears in the FirstDropdown Component as props to SecondDropdown Component. Clearly I'm not doing this correctly. Any Help will be appreciate. Thank you in advance!
class DropdownBar extends React.Component {
constructor(props) {
super(props);
}
render () {
return (
<div>
<div className="top-bar">
<Row>
<div style={{marginTop: 15, marginBottom:15}}>
<Col span={8}><FirstDropdown practice={this.props.practice} /></Col>
<Col span={8}><SecondDropdown /></Col>
</div>
</Row>
</div>
</div>
)
}
class FirstDropdown extends React.Component {
constructor() {
super();
this.state = {
practices: [
name = 'Jon',
name = 'potato',
name = 'stark',
],
practice: 'stark'
}
}
onChangePractice(value) {
console.log(`selected ${value}`);
this.setState({
practice: value
})
}
render () {
const {practices} = this.state
return (
<div>
<Row>
<div className="First-dropdown">
<Col span={8}><div className="dropdown-title">Research: </div></Col>
<Col span={14}>
<Select
showSearch
style={{ width: '100%' }}
placeholder="Select a Something"
optionFilterProp="children"
onChange={this.onChangePractice.bind(this)}
onFocus={onFocus}
onBlur={onBlur}
onSearch={onSearch}
filterOption={(input, option) =>
option.props.children.toLowerCase().indexOf(input.toLowerCase()) >= 0
}
>
{practices.map(practice => (
<Option
value={practice}
key={practice}
data-automation={practice.name}
>{practice}</Option>
))}
</Select>
</Col>
</div>
</Row>
</div>
)
}
class SecondDropdown extends React.Component {
constructor(props) {
super(props);
this.state = {
modules: [
name = 'Drogon',
name = 'Rhaegal',
name = 'Viserion',
]
}
}
ponentDidUpdate(prevProps) {
console.log(this.props.practice)
if (!equal(this.props.practice, prevProps.practice))
{
this.updatePractice();
}
}
render () {
const {modules} = this.state
console.log(this.props.practice )
let practice = this.props.practice;
if (practice === 'stark') {
return (
<div>
<Row>
<div className="benchmark-dropdown">
<Col span={4}><div className="dropdown-title">Module: </div></Col>
<Col span={16}>
<Select
showSearch
style={{ width: '100%' }}
placeholder="Select Something"
optionFilterProp="children"
onChange={onChange}
onFocus={onFocus}
onBlur={onBlur}
onSearch={onSearch}
filterOption={(input, option) =>
option.props.children.toLowerCase().indexOf(input.toLowerCase()) >= 0
}
>
{modules.map(item => (
<Option
value={item}
key={item}
>{item}</Option>
))}
</Select>
</Col>
</div>
</Row>
</div>
)
} else {
return <div> NOOOOO </div>
}
}
2 Answers
Reset to default 2In order for both dropdowns to have access to the practice prop, you need to lift it up to the DropdownBar's state, and pass down both practice and a way to update practice.
class DropdownBar extends Component {
state = {
practice: '',
}
handlePracticeChange = (value) => {
setState({ practice: value });
}
render() {
return (
<div>
<FirstDropdown
practice={this.state.practice}
onPracticeChange={this.handlePracticeChange}
/>
<SecondDropdown practice={this.state.practice} />
</div>
)
}
}
So, practice only lives in DropdownBar, and the practices array should live in FirstDropdown child.
In FirstDropdown, you should pass props.onPracticeChange to your Select's onChange:
class FirstDropdown extends Component {
render() {
...
<Select
onChange={this.props.onPracticeChange}
...
}
}
From your code example, it looks like Select passes the currently selected value to onChange.
I'd pull the state into the parent.
class MainBar extends React.Component {
state = {
practice: null
};
handleChange = practice => {
this.setState({ practice });
}
render() {
return (
<div className="top-bar">
<Row>
<div style={{marginTop: 15, marginBottom:15}}>
<Col span={8}>
<FirstDropdown
onChange={this.handleChange}
practice={this.state.practice}
/>
</Col>
<Col span={8}>
<SecondDropdown practice={this.state.practice} />
</Col>
</div>
</Row>
</div>
);
}
}