I'm having an issue where react-loadable is causing one of my input components to re-render and lose focus after a state update. I've done some digging and I can't find anyone else having this issue, so I think that I'm missing something here.
I am attempting to use react-loadable to dynamically include components into my app based on a theme that the user has selected. This is working fine.
./components/App
import React from 'react';
import Loadable from 'react-loadable';
/**
* Import Containers
*/
import AdminBar from '../../containers/AdminBar';
import AdminPanel from '../../components/AdminPanel';
import 'bootstrap/dist/css/bootstrap.css';
import './styles.css';
const App = ({ isAdmin, inEditMode, theme }) => {
const MainContent = Loadable({
loader: () => import('../../themes/' + theme.name + '/components/MainContent'),
loading: () => (<div>Loading...</div>)
});
const Header = Loadable({
loader: () => import('../../themes/' + theme.name + '/components/Header'),
loading: () => (<div>Loading...</div>)
});
return (
<div>
{
(isAdmin) ? <AdminBar
className='admin-bar'
inEditMode={inEditMode} /> : ''
}
<Header
themeSettings={theme.settings.Header} />
<div className='container-fluid'>
<div className='row'>
{
(isAdmin && inEditMode) ? <AdminPanel
className='admin-panel'
theme={theme} /> : ''
}
<MainContent
inEditMode={inEditMode} />
</div>
</div>
</div>
);
};
export default App;
./components/AdminPanel
import React from 'react';
import Loadable from 'react-loadable';
import './styles.css';
const AdminPanel = ({ theme }) => {
const ThemedSideBar = Loadable({
loader: () => import('../../themes/' + theme.name + '/components/SideBar'),
loading: () => null
});
return (
<div className='col-sm-3 col-md-2 sidebar'>
<ThemedSideBar
settings={theme.settings} />
</div>
);
};
export default AdminPanel;
This is what my <ThemedSideBar /> components looks like:
./themes/Default/components/SideBar
import React from 'react';
import ThemeSettingPanel from '../../../../components/ThemeSettingPanel';
import ThemeSetting from '../../../../containers/ThemeSetting';
import './styles.css';
const SideBar = ({ settings }) => {
return (
<ThemeSettingPanel
name='Header'>
<ThemeSetting
name='Background Color'
setting={settings.Header}
type='text'
parent='Header' />
<ThemeSetting
name='Height'
setting={settings.Header}
type='text'
parent='Header' />
</ThemeSettingPanel>
);
};
export default SideBar;
./components/ThemeSettingPanel
import React from 'react';
import { PanelGroup, Panel } from 'react-bootstrap';
const ThemeSettingPanel = ({ name, children }) => {
return (
<PanelGroup accordion id='sidebar-accordion-panelGroup'>
<Panel>
<Panel.Heading>
<Panel.Title toggle>{name}</Panel.Title>
</Panel.Heading>
<Panel.Body collapsible>
{children}
</Panel.Body>
</Panel>
</PanelGroup>
);
};
export default ThemeSettingPanel;
./containers/ThemeSetting
import React, { Component } from 'react';
import { connect } from 'react-redux';
import { themeSettingChange } from '../App/actions';
import ThemeSetting from '../../components/ThemeSetting';
class ThemeSettingContainer extends Component {
constructor(props) {
super(props);
this.handleOnChange = this.handleOnChange.bind(this);
}
handleOnChange(name, parent, value) {
const payload = {
name: name,
parent,
value: value
};
this.props.themeSettingChange(payload);
}
render() {
return (
<ThemeSetting
name={this.props.name}
setting={this.props.setting}
parent={this.props.parent}
type={this.props.type}
handleOnChange={this.handleOnChange} />
);
}
}
//----Redux Mappings----//
const mapStateToProps = (state) => ({
});
const mapDispatchToProps = {
themeSettingChange: (value) => themeSettingChange(value)
};
export default connect(mapStateToProps, mapDispatchToProps)(ThemeSettingContainer);
./component/ThemeSetting
import React from 'react';
import TextField from '../common/TextField';
import './styles.css';
const ThemeSetting = ({ name, setting, type, parent, handleOnChange }) => {
return (
<div className='row theme-setting'>
<div className='col-xs-7'>
{name}
</div>
<div className='col-xs-5'>
{
generateField(type, setting, name, parent, handleOnChange)
}
</div>
</div>
);
};
function generateField(type, setting, name, parent, handleOnChange) {
const value = setting ? setting[name] : '';
switch (type) {
case 'text':
return <TextField
value={value}
name={name}
parent={parent}
handleOnChange={handleOnChange} />;
default:
break;
}
}
export default ThemeSetting;
./components/common/TextField
import React from 'react';
import { FormControl } from 'react-bootstrap';
const TextField = ({ value, name, parent, handleOnChange }) => {
return (
<FormControl
type='text'
value={value}
onChange={(e) => {
handleOnChange(name, parent, e.target.value);
}} />
);
};
export default TextField;
When a field inside of my Admin Panel is updated, a state change is triggered. It seems like this triggers react-loadable to re-render my <ThemedSideBar /> components which destroys my input and creates a new one with the updated value. Has anyone else had this issue? Is there a way to stop react-loadable from re-rendering?
EDIT: Here is the requested link to the repo.
EDIT: As per conversation in the comments, my apologies, I misread the question. Answer here is updated (original answer below updated answer)
From looking at the react-loadable docs, it appears that the Loadable HOC is intended to be called outside of a render method. In your case, you are loading ThemedSideBar in the render method of AdminPanel. I suspect that the change in your TextEdit's input, passed to update your Redux state, and then passed back through the chain of components was causing React to consider re-rendering AdminPanel. Because your call to Loadable was inside the render method (i.e. AdminPanel is a presentational component), react-loadable was presenting a brand new loaded component every time React hit that code path. Thus, React thinks it needs to destroy the prior component to appropriately bring the components up to date with the new props.
This works:
import React from 'react';
import Loadable from 'react-loadable';
import './styles.css';
const ThemedSideBar = Loadable({
loader: () => import('../../themes/Default/components/SideBar'),
loading: () => null
});
const AdminPanel = ({ theme }) => {
return (
<div className='col-sm-3 col-md-2 sidebar'>
<ThemedSideBar
settings={theme.settings} />
</div>
);
};
export default AdminPanel;It seems that your problem is likely related to the way you've built TextField and not react-loadable.
The FormControl is taking value={value} and the onChange handler as props. This means you've indicated it is a controlled (as opposed to uncontrolled) component.
If you want the field to take on an updated value when the user types input, you need to propagate the change caught by your onChange handler and make sure it gets fed back to the value in the value={value} prop.
Right now, it looks like value will always be equal to theme.settings.Height or the like (which is presumably null/empty).
An alternative would be to make that FormControl an uncontrolled component, but I'm guessing you don't want to do that.