What is the best way to incorporate index from a JSX map into a CSS file?

Question

What is the best way to incorporate index from a JSX map into a CSS file?

One challenge I am facing is reusing an n dropdown input element in various parts of different applications. This dropdown input element contains options with dropdowns nested within it, and the number of dropdowns can vary. For example:

https://i.sstatic.net/diia5.png

I want to apply styling based on a class

react-select-2-option-[indexOfTheOptionWithDropdown]

. For instance, the dynamic css class for Sydney 333 would be react-select-2-option-2 because it's the second dropdown element in the input field. Similarly, Sydney 333222 would have a dynamic class of react-select-2-option-1.

The problem arises when trying to assign indices to these classes based on the length and position of the dropdown options. The default styles applied by the 'react-select' library are difficult to override, so hardcoding the values seems like a static solution. Is there a more dynamic approach?

In my JSX component, I'm mapping the options along with index numbers. Ideally, I would like to somehow pass this index from the JSX component to the CSS file. Is this feasible? Should I consider using styled CSS components and passing the index to overwrite the CSS, or are there other methods to achieve this?

EDIT: I hardcoded react-select-2-option-4:hover with white background https://i.sstatic.net/161WW.png

default style (options with grey background, no indication of hover) https://i.sstatic.net/sAHOp.png

javascript css reactjs react-select

Answer 1

Answer №1

To define a CSS class name using an index, you can follow the code snippet below.

var options = <list of DOM options like Sydney 333222 and Sydney 333>;
for (var i in options) {
  options[i].className = `react-select-2-option-${i}`;
}

However, this approach may seem unusual. It is recommended to use a variable with common CSS properties and then apply them to the specific style:

var commonCss = { color: 'red', fontWeight: 'bold' };
var specificCss = [{ border: 'solid 1px blue'}];
var options = <list of DOM options like Sydney 333222 and Sydney 333>;
for (var i in options) {
  Object.keys({ ...commonCss, ...specificCss[i] }).forEach(function(key) {
    options[i][key].className = options[key];
  });
}

You can also define a CSS class with common styles and only apply the specific ones as needed:

var specificCss = [{ border: 'solid 1px blue'}];
var options = <list of DOM options like Sydney 333222 and Sydney 333>;
for (var i in options) {
  Object.keys(specificCss[i]).forEach(function(key) {
    options[i][key].className = options[key];
  });
}

Answer 2

To define a CSS class name using an index, you can follow the code snippet below.

var options = <list of DOM options like Sydney 333222 and Sydney 333>;
for (var i in options) {
  options[i].className = `react-select-2-option-${i}`;
}

However, this approach may seem unusual. It is recommended to use a variable with common CSS properties and then apply them to the specific style:

var commonCss = { color: 'red', fontWeight: 'bold' };
var specificCss = [{ border: 'solid 1px blue'}];
var options = <list of DOM options like Sydney 333222 and Sydney 333>;
for (var i in options) {
  Object.keys({ ...commonCss, ...specificCss[i] }).forEach(function(key) {
    options[i][key].className = options[key];
  });
}

You can also define a CSS class with common styles and only apply the specific ones as needed:

var specificCss = [{ border: 'solid 1px blue'}];
var options = <list of DOM options like Sydney 333222 and Sydney 333>;
for (var i in options) {
  Object.keys(specificCss[i]).forEach(function(key) {
    options[i][key].className = options[key];
  });
}

What is the best way to incorporate index from a JSX map into a CSS file?

Answer №1

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