Best practice when adding whitespace in JSX

问题

I understand how (and why) to add a whitespace in JSX, but I am wondering what's best practice or if any makes any real difference?

Wrap both elements in a span

<div className="top-element-formatting">
  <span>Hello </span>
  <span className="second-word-formatting">World!</span>
</div>

Add them on one line

  <div className="top-element-formatting">
    Hello <span className="second-word-formatting">World!</span>
  </div>

Add space with JS

<div className="top-element-formatting">
    Hello {" "}
    <span className="second-word-formatting">World!</span>
</div>

回答1:

Because &nbsp causes you to have non-breaking spaces, you should only use it where necessarily. In most cases, this will have unintended side effects.

Older versions of React, I believe all those before v14, would automatically insert   when you had a newline inside of a tag.

While they no longer do this, that's a safe way to handle this in your own code. Unless you have styling that specifically targets span (bad practice in general), then this is the safest route.

Per your example, you can put them on a single line together as it's pretty short. In longer-line scenarios, this is how you should probably do it:

  <div className="top-element-formatting">
    Hello <span className="second-word-formatting">World!</span>
    <span> </span>
    So much more text in this box that it really needs to be on another line.
  </div>

This method is also safe against auto-trimming text editors.

The other method is using {' '} which doesn't insert random HTML tags. This could be more useful when styling, highlighting elements, and removes clutter from the DOM. If you don't need backwards compatibility with React v14 or earlier, this should be your preferred method.

  <div className="top-element-formatting">
    Hello <span className="second-word-formatting">World!</span>
    {' '}
    So much more text in this box that it really needs to be on another line.
  </div>

回答2:

You can add simple white space with quotes sign: {" "}

Also you can use template literals, which allow to insert, embedd expressions (code inside curly braces):

`${2 * a + b}.?!=-` // Notice this sign " ` ",its not normal quotes.

回答3:

I tend to use  

It's not pretty but it's the least confusing way to add whitespace I've found and it gives me absolute control over how much whitespace I add.

If I want to add 5 spaces:

Hello     World!

It's easy to identify exactly what I'm trying to do here when I come back to the code weeks later.

回答4:

You don't need to insert   or wrap your extra-space with . Just use HTML entity code for space -  

Insert regular space as HTML-entity

<form>
  <div>Full name:</span>&#32;
  <span>{this.props.fullName}</span>
</form>

回答5:

You can use curly braces like an expression with both double quotes and single quotes for space i.e.,

{" "} or {' '}

You can also use ES6 template literals i.e.,

`   <li></li>` or `  ${value}`

You can also use &nbsp like below

<span>sample text &nbsp; <span>

You can also use &nbsp in dangerouslySetInnerHTML when printing html content

<div dangerouslySetInnerHTML={{__html: 'sample html text: &nbsp;'}} />

回答6:

use {} or {``} or   to create space between span element and content.

<b> {notif.name} </b> <span id="value"> &nbsp;{ notif.count }{``} </span>

回答7:

I have been trying to think of a good convention to use when placing text next to components on different lines, and found a couple good options:

<p>
    Hello {
        <span>World</span>
    }!
</p>

<p>
    Hello {}
    <span>World</span>
    {} again!
</p>

Each of these produces clean html without additional   or other extraneous markup. It creates fewer text nodes than using {' '}, and allows using of html entities where {' hello & goodbye '} does not.

回答8:

You can use the css property white-space and set it to pre-wrap to the enclosing div element.

div {
     white-space: pre-wrap;
}

来源：https://stackoverflow.com/questions/40264084/best-practice-when-adding-whitespace-in-jsx

标签

javascript

reactjs

react-jsx