React Native CSS Triangles not functioning anymore

Question

React Native CSS Triangles not functioning anymore

I'm currently developing an application that involves triangles overlaying other containers and divs. This issue was previously resolved using CSS with the following code:

.triangle:after {
  content: "";
  display: block;
  position: absolute;
  top: 15px;
  left: -15px;
  width: 0;
  border-width: 0px 0px 15px 15px;
  border-style: solid;
}

Unfortunately, this solution no longer works in React. Can anyone provide a new approach to solving this problem?

css reactjs react-native

Answer 1

Answer №1

If you're looking to create triangles in React Native, there is a CSS trick that can help achieve this effect. One approach is to use a specialized class like the one I developed: https://github.com/Jpoliachik/react-native-triangle

Alternatively, you can manually generate the triangle using a tool such as: and then adapt the styles to fit the React Native syntax.

For instance, a CSS representation of an Isosceles triangle measuring 90x90 pointing upwards would look like:

width: 0;
height: 0;
border-style: solid;
border-width: 0 45px 90px 45px;
border-color: transparent transparent #007bff transparent;

However, in React Native, the equivalent styles would be:

triangle: {
     width: 0,
     height: 0,
     backgroundColor: 'transparent',
     borderStyle: 'solid',
     borderTopWidth: 0,
     borderRightWidth: 45,
     borderBottomWidth: 90,
     borderLeftWidth: 45,
     borderTopColor: 'transparent',
     borderRightColor: 'transparent',
     borderBottomColor: 'red',
     borderLeftColor: 'transparent',
   },

Answer 2

If you're looking to create triangles in React Native, there is a CSS trick that can help achieve this effect. One approach is to use a specialized class like the one I developed: https://github.com/Jpoliachik/react-native-triangle

Alternatively, you can manually generate the triangle using a tool such as: and then adapt the styles to fit the React Native syntax.

For instance, a CSS representation of an Isosceles triangle measuring 90x90 pointing upwards would look like:

width: 0;
height: 0;
border-style: solid;
border-width: 0 45px 90px 45px;
border-color: transparent transparent #007bff transparent;

However, in React Native, the equivalent styles would be:

triangle: {
     width: 0,
     height: 0,
     backgroundColor: 'transparent',
     borderStyle: 'solid',
     borderTopWidth: 0,
     borderRightWidth: 45,
     borderBottomWidth: 90,
     borderLeftWidth: 45,
     borderTopColor: 'transparent',
     borderRightColor: 'transparent',
     borderBottomColor: 'red',
     borderLeftColor: 'transparent',
   },

Answer 3

Answer №2

display() {
    return (
        <View style={[styles.triangle,styles.arrowUp]}/>
    );
}

Including some cool styles

const styles = {
    triangle: {
        width: 0,
        height: 0,
        backgroundColor: 'transparent',
        borderStyle: 'solid',
    },
    arrowUp: {
        borderTopWidth: 0,
        borderRightWidth: 30,
        borderBottomWidth: 30,
        borderLeftWidth: 30,
        borderTopColor: 'transparent',
        borderRightColor: 'transparent',
        borderBottomColor: "tomato",
        borderLeftColor: 'transparent',
    },
    ...
}

Check out the source for more info : https://github.com/Jpoliachik/react-native-triangle

Answer 4

display() {
    return (
        <View style={[styles.triangle,styles.arrowUp]}/>
    );
}

Including some cool styles

const styles = {
    triangle: {
        width: 0,
        height: 0,
        backgroundColor: 'transparent',
        borderStyle: 'solid',
    },
    arrowUp: {
        borderTopWidth: 0,
        borderRightWidth: 30,
        borderBottomWidth: 30,
        borderLeftWidth: 30,
        borderTopColor: 'transparent',
        borderRightColor: 'transparent',
        borderBottomColor: "tomato",
        borderLeftColor: 'transparent',
    },
    ...
}

Check out the source for more info : https://github.com/Jpoliachik/react-native-triangle

Answer 5

Answer №3

Beginner's Guide:

Many newcomers to CSS find the process of creating a triangle shape challenging. However, understanding how borders work in CSS is key to mastering this technique.

To create a triangle using CSS styles, pay close attention to the endings of the borders. By adjusting the color of each border, you can see that they are not straight at their endings. This creates the illusion of a triangle shape.

By increasing the border width gradually, you'll notice the triangle shape starting to form. Experiment with different border widths to achieve your desired triangle design.

In order to eliminate any space inside the container that may be preventing the tip of the triangle from forming, simply set the height and width of the container to 0px.

Once you've mastered creating triangles with CSS, you can experiment with various styles to customize your triangles as needed.

For React Native users, the same principles apply - just remember to use camelCase notation for style properties.

For more hands-on practice and exploration, I encourage you to experiment with the code yourself.

Reference: The image used in this tutorial was created using the w3schools online code editor.

Try Out the Code Editor

Answer 6