The appearance of the React user interface in my app does not match what is displayed in the inspect element tool

Question

The appearance of the React user interface in my app does not match what is displayed in the inspect element tool

Strange issue at hand. The progress bar in question appears like this:

1 export default function PercentageBar(props) {
2     return (
3         <div className="w-full h-1 my-1 bg-stone-200">
4             <div className={`h-1 bg-orange-500 w-[${props.percent}%]`} />
5         </div>
6     );
7 }

The styling is achieved using Tailwind CSS. To explain for those unfamiliar, the outer div spans the full width of the parent div, has a height of 1, top and bottom margin of 1, and is colored in a grayish hue. The inner div is then layered on top, also with a height of 1. The inner div is in orange and spans the width of props.percent (a percentage of the parent div's total width).

I have confirmed that props.percent is correctly passed in.

However, when props.percent dynamically changes during runtime, line 4 behaves strangely at times (irrespective of the specific percent value).

For instance, if props.percent was initially 48 and later becomes 52, Inspect Element shows:

<div className={`h-1 bg-orange-500 w-[52%]`} />

which is accurate. Yet, it renders as follows (a full bar)

<div className={`h-1 bg-orange-500 w-[100%]`} />

Moreover, there are instances where it renders as if props.percent is 0, post a change in the percent value. This issue persists regardless of attempts like hard refreshes, cache resets, etc., occurring sporadically and across various browsers. Sometimes the problem doesn't surface with repeated refreshing. Any insight into what might be occurring here? Much obliged!

javascript html css reactjs tailwind-css

Answer 1

Answer №1

I encountered a similar issue, but with the use of classNames. To address this, I passed the classNames from where I'm utilizing the component. This ensures that the component will re-render when props change. Additionally, I included the ! important keyword if anything alters your class. I hope this solution resolves your problem.

export default function PercentageBar({widthPercentage}) {
    return (
        <div className="w-full h-1 my-1 bg-stone-200">
            <div className={`h-1 bg-orange-500 ${widthPercentage}`} />
        </div>
    );
}

<PercentageBar widthPercentage={`!${w-[${props.percent}%]}`} />

Answer 2

I encountered a similar issue, but with the use of classNames. To address this, I passed the classNames from where I'm utilizing the component. This ensures that the component will re-render when props change. Additionally, I included the ! important keyword if anything alters your class. I hope this solution resolves your problem.

export default function PercentageBar({widthPercentage}) {
    return (
        <div className="w-full h-1 my-1 bg-stone-200">
            <div className={`h-1 bg-orange-500 ${widthPercentage}`} />
        </div>
    );
}

<PercentageBar widthPercentage={`!${w-[${props.percent}%]}`} />

Answer 3

Answer №2

Users working with Tailwind 3 (or Tailwind 2 in JIT mode) should note that dynamically creating classes is not possible as they will not be included in the final CSS output.

Instead of creating dynamic classes for your variable value, consider using a style prop to specify the width. Here's an example:

<div style={{width: `${someValue}%`}} className={'h-1 bg-blue-700'} />

Answer 4

Users working with Tailwind 3 (or Tailwind 2 in JIT mode) should note that dynamically creating classes is not possible as they will not be included in the final CSS output.

Instead of creating dynamic classes for your variable value, consider using a style prop to specify the width. Here's an example:

<div style={{width: `${someValue}%`}} className={'h-1 bg-blue-700'} />

Answer 5

Answer №3

Discovered the solution! Credit goes to Ed Lucas for guiding me in the right direction. He's absolutely correct - dynamically creating class names in Tailwind is not possible. For a detailed explanation, check out this link.

Although the style tag recommended by Ed didn't work for me, I came up with a different approach. I created a new function that uses a switch statement to generate continuous strings of class names based on the width value. Here's an example:

function getWidthClassName(percent) {
    switch (percent) {
        case 0:
            return 'w-[0%]';
        case 1:
            return 'w-[1%]';
        case 2:
            return 'w-[2%]';
        ...
        case 99:
            return 'w-[99%]';
        case 100:
            return 'w-[100%]';
        default:
            return 'w-[0%]';
    }
}

With this function in place, my progress bar code now looks like this:

export default function PercentageBar({percent}) {
    let widthClassName = getWidthClassName(percent);
    return (
        <div className="w-full h-1 my-1 bg-stone-200">
            <div className={`h-1 bg-orange-500 ${widthClassName}`} />
        </div>
    );

By statically constructing class names instead of dynamically doing so at runtime, Tailwind is satisfied and so are we.

Answer 6

Discovered the solution! Credit goes to Ed Lucas for guiding me in the right direction. He's absolutely correct - dynamically creating class names in Tailwind is not possible. For a detailed explanation, check out this link.

Although the style tag recommended by Ed didn't work for me, I came up with a different approach. I created a new function that uses a switch statement to generate continuous strings of class names based on the width value. Here's an example:

function getWidthClassName(percent) {
    switch (percent) {
        case 0:
            return 'w-[0%]';
        case 1:
            return 'w-[1%]';
        case 2:
            return 'w-[2%]';
        ...
        case 99:
            return 'w-[99%]';
        case 100:
            return 'w-[100%]';
        default:
            return 'w-[0%]';
    }
}

With this function in place, my progress bar code now looks like this:

export default function PercentageBar({percent}) {
    let widthClassName = getWidthClassName(percent);
    return (
        <div className="w-full h-1 my-1 bg-stone-200">
            <div className={`h-1 bg-orange-500 ${widthClassName}`} />
        </div>
    );

By statically constructing class names instead of dynamically doing so at runtime, Tailwind is satisfied and so are we.

The appearance of the React user interface in my app does not match what is displayed in the inspect element tool

Answer №1

Answer №2

Answer №3

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