Locate a component in React project - reactjs

I wrote a Logout button component in my React app for which I wish to locate at the top right corner of the screen.
render() {
<LogoutButtonComponent height: , backgroudColor: />
}
It wouldn't let me assign any values for height and etc.
This is the Logout component:
import React, { Component } from 'react';
import PropTypes from 'prop-types';
export default class LogOutButton extends Component {
static contextTypes = {
store: PropTypes.object.isRequired,
};
handleClick = () => {
this.props.onLogout();
};
render() {
return <button type="button" onClick={this.handleClick}>Logout</button>;
}
}
Should I locate it by < col /> ?

To add inline styles, you should defined a style object as prop, and pass it values, like doniyor2109 mentioned. There are a few caveats to using this, however.
style={{ height: 100, height: '100px', height: '100%', minHeight: '100px'}}.
Not every value should be passed as integer, some need to be passed as a string
Not every css attribute gets passed as you would expect them to, the css min-height actually gets passed as minHeight, so replace all hyphens with lower camel case style
Inline styles get insanely difficult to manage. I suggest you at the very least create an object outside the component, and pass it in like:
const DivStyle = { minHeight: '100px' }
and then:
<LogoutButtonComponent style={DivStyle} />
You can prefix that DivStyle with an export if you want to import {DivStyle} from './somefile' in other places
I suggest you check out a library like styled-components as it makes styling much easier!
I suggest you check out this article which outlines your options

You don't really add styles to your component like that. It's better to add those styles in the source for the actual component. So how exactly do you want it displayed? I will provide a template kind of and you can change it to what you want.
Go to your source for your Logout Button Component. In the return of your render method try adding a div call it container. Then add styling in a css file to that div or if you are using react-bootstrap or reactstrap or #material/ui/core you can adjust the style according to their documentation.
You can add your css for the className .container to make it appear the way you would like.
import React, { Component } from 'react';
import PropTypes from 'prop-types';
export default class LogOutButton extends Component {
static contextTypes = {
store: PropTypes.object.isRequired,
};
handleClick = () => {
this.props.onLogout();
};
render() {
return (
<div className="container">
{* notice the className here *}
<button type="button" onClick={this.handleClick}>Logout</button>
</div>
)
}
}
Hope this helps.

Related

Second class of multiple classes can't override style

button.module.css
.general_button {
width: 100%;
}
button.js
import React from 'react';
import styles from './button.module.css';
const GeneralButton = ({ text, className}) => {
return (
<button className={`${styles.general_button} ${className}`}>
<p className={styles.text}>{text}</p>
</button>
);
};
export { GeneralButton };
app.module.css
.next_btn {
width: 35%;
}
app.js
import React from 'react';
import classes from './app.module.css';
import { GeneralButton } from './components/Buttons';
const App = () => {
return (
<div>
<GeneralButton className={classes.next_btn} text='next' />
</div>
)
}
export default App;
When I used button component from app, button component is working with 'width:100%'. I would like to be button component is with 'width: 35%'.
This is when I inspect browser.
This is when I inspect browser.
Since both classes are equally specific, your app chooses whichever comes later in the stylesheet. Unfortunately you have much control over this order since it is likely generated by webpack (or whatever bundler you happen to be using).
One of the main benefits of using modular css is to avoid having to fight specificity battles such as this, so I would suggest reworking the button component slightly - something like this might work:
const GeneralButton = ({ text, variant }) => {
let buttonClass = styles.general_button;
if (variant === "next") {
buttonClass = styles.next_button;
}
return (
<button className={buttonClass}>
<p className={styles.text}>{text}</p>
</button>
);
};
The advantage here is that the button lays out the options for how to present it and the parent component just selects the type it needs. This makes it safer to re-work the button component in the future since it encapsulates all of it's states.

How to override prime-react component CSS styling?

I am using prime-react to style my React page. But I want a more compact website with very few padding and minimum styling. For this purpose, I want to override a few CSS properties for the prime-react components.
For eg, I am trying to reduce the padding for the MenuBar -
HomePage.js
import {React, Component } from 'react';
import { Menubar } from 'primereact/menubar';
import 'primereact/resources/themes/saga-blue/theme.css';
import 'primereact/resources/primereact.min.css';
import 'primeicons/primeicons.css';
import styled from "styled-components";
export default class HomeMenuBar extends Component {
// menu code ...
render() {
return (
<div>
<div className="card">
<Menubar model={this.items} className={this.props.className} />
</div>
</div>
);
}
}
const ComponentView = styled(HomeMenuBar)`
.p-menubar .p-menubar-root-list > .p-menuitem > .p-menuitem-link {
padding: 0.1rem 1rem !important;
}
`;
The above code makes no difference to the original styling.
I am trying to make use of this component.
However, particularly using these styled-components I don't like it. I am new to react and would like to know if there are better alternatives like, storing the CSS properties in another file and then importing it in the required file. I tried this part but it also didn't work out.
I work with react over a year and have seen lot of different ways to customise components and so far, I think that styled-components is the most convenient way to customize components if you cook them right.
I love to put all customized components with styled to a separate file near the index.js called styled.js of Component.js and Componnet.styled.js (in the separate folder of course MyComponent/index.js);
In styled.js you export all components like this:
export const Container = styled.div`
.p-menubar .p-menubar-root-list > .p-menuitem > .p-menuitem-link {
padding: 0.1rem 1rem !important;
}
`
In index.js file you inport them like this:
import {Container} from './styled'
// or import * as Styled from './styled' (if you have a lot of customized components);
export default class HomeMenuBar extends Component {
// menu code ...
render() {
return (
<Container>
<div className="card">
<Menubar model={this.items} className={this.props.className} />
</div>
</Container>
);
}
}
If you want to try something more like classic css try to look at css-modules.
This article can help https://www.triplet.fi/blog/practical-guide-to-react-and-css-modules/
You can also try patch-styles, a more declarative way to apply CSS/SCSS modules to your code. Also, check out the StackBlitz example.

React Material UI Syntax with Props Explained

I understand the basic of react code such as passing data to child component and passing data back to parent with props. I encountered this code below from React Material UI which is abit confusing. Was hoping to get some explanation.
import React from 'react';
import PropTypes from 'prop-types';
import { withStyles } from '#material-ui/core/styles';
import CircularProgress from '#material-ui/core/CircularProgress';
import purple from '#material-ui/core/colors/purple';
const styles = theme => ({
progress: {
margin: theme.spacing.unit * 2,
},
});
function CircularIndeterminate(props) {
const { classes } = props;
return (
<div>
<CircularProgress className={classes.progress} />
<CircularProgress className={classes.progress} size={50} />
<CircularProgress className={classes.progress} color="secondary" />
<CircularProgress className={classes.progress} style={{ color: purple[500] }} thickness={7} />
</div>
);
}
CircularIndeterminate.propTypes = {
classes: PropTypes.object.isRequired,
};
export default withStyles(styles)(CircularIndeterminate);
Here is what I understand.
1.The component takes in props so I can pass data down to this child component and before render it will extract the classes property from props.classes.
2.There is a styles function that takes in a theme variable and returns an object progress which has some styling which is used by classes.progress
3.withStyle is some sort of higher order component.
But with this knowledge, this code is abit confusing.
How come the code can do classes.progress, why does classes variable have anything to do with the progress style
What is the purpose of
CircularIndeterminate.propTypes = {
classes: PropTypes.object.isRequired,
};
classes variable that is that is passed in as a prop is an object with progress being one of its key. The classes object might look like
classes = {
progress: 'half'
}
Now the value of classes.progress which in the above classes object is half is assigned as a className prop to the CircularProgress component.
Regarding
CircularIndeterminate.propTypes = {
classes: PropTypes.object.isRequired,
};
The above syntax is to add typechecking capabilities to your component. React has some built-in typechecking abilities. To run typechecking on the props for a component, you can assign the special propTypes property.
In your case, it means that the CircularIndeterminate expects a prop classes which is of type object and is a Required prop.
To read more about PropTypes, please visit the docs

Material-UI #next Does not support props-based styling?

With the arrival of Material-UI#next comes the replacement of LESS-based styling with CSS-to-JS-based styling. However, the component demos on Material-UI's website appear to ignore the creation of props-based-styling. I'm trying to create divs containing various Material-UI components at specific absolute heights on my page, however, the requirement of the stylesheet being predefined outside of the class means that the properties within the stylesheet can't be based on props passed to the component. Am I missing something?
For example:
import React, {Component} from 'react';
import {withStyles, createStyleSheet} from 'material-ui/styles';
import Button from 'material-ui/Button';
const styleSheet = createStyleSheet({
container: {
position: "absolute",
top: /*How can this be dependent upon the props passed to the component?*/,
height: /*How can this be dependent upon the props passed to the component?*/,
}
});
class Foo extends Component {
render() {
let classes = this.props.classes;
return (
<div className={classes.container}>
<Button raised/>
</div>
);
}
}
export default withStyles(styleSheet)(Foo);
The example component displayed above can't have props-dependent styles, because props is not defined when the stylesheet is created. So how do I solve this problem? IS there a solution?
I would strongly advise you check out Styled Compoments. They make styling very simple and even allow you to pass third party components (in your case Material UI components). They also allow you to pass in props like the following:
const Stylesheet = styled.div`
color: ${props => props.primary ? 'white' :
`
<Stylesheet primary>My Div</Stylesheet>
Check out the docs for more details, that was a very simple example, but they are super easy to work with and you can accomplish exactly what you need with them.

size element based on another element's dimensions in reactjs

Say I have an element like this:
export default class DemoAxis extends Component {
componentDidMount() {
const el = findDOMNode(this);
this.dimensions = getDimensionsFromNode(el);
}
render() {
const style = {
parent: {border: "1px solid #ccc", margin: "2%", maxWidth: "40%", padding: 10}
};
return (
<div ref="line">
<svg style={style} width={this.dimensions.width} height={this.dimensions.height}
I want to size the svg element based on the dimensions of the line element.
The element's dimensions will only be available in componentDidMount which is called after render.
I know I can call setState but that will cause a re-render and that might give me UI issues.
What is the best way of achieving this?
You can try react-dimensions
Wraps a react component and adds properties containerHeight and containerWidth. Useful for responsive design. Properties update on window resize. Note that the parent element must have either a height or a width, or nothing will be rendered
// ES2015
import React from 'react'
import Dimensions from 'react-dimensions'
class MyComponent extends React.Component {
render() (
<div
containerWidth={this.props.containerWidth}
containerHeight={this.props.containerHeight}
>
</div>
)
}
export default Dimensions()(MyComponent) // Enhanced component

Resources