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JavaScript Vue.js Basics Sweeping Vues: Loops, Methods, Directives Conditionally Adding or Removing Classes

Posted by Kristian Woods
Kristian Woods
23,414 Points

How can you add a "-" in between class names that are separated by a space?

I have this solution for challenge she gave in the last video 

      <ul>
        <li v-show="type === '' || type === media.type" 
            v-for="media in mediaList" 
            v-on:click="toggleDetails(media)"
            v-bind:class="[media.showDetail ? 'less': 'more', media.type.replace(' ', '-').toLowerCase()]">
          <h3>{{media.title}}</h3> 
          <div v-show="media.showDetail">
            <p>{{media.description}}</p>
            <p v-if="media.contributor" class="byline">By: {{media.contributor}}</p>
          </div>
        </li>
      </ul>

This works. However, only for the very first space in a string of words. For example:

'str one' => 'str-one'

'str one str two' => 'str-one str two'

Only the first encountered space gets a hyphen... why?

Thanks

3 Answers

Adam Fields
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.a{fill-rule:evenodd;}techdegree seal-36
Adam Fields
Full Stack JavaScript Techdegree Graduate 37,838 Points
Adam Fields
.a{fill-rule:evenodd;}techdegree seal-36
Adam Fields
Full Stack JavaScript Techdegree Graduate 37,838 Points

Mike's answer is the most expressive, since RegEx can be difficult to read for the unfamiliar.

However, to piggyback on Kris' answer, I'd use the RegEx whitespace character:

// \s - matches all whitespace
// g - doesn't stop after the first match
media.type.replace(/\s/g, '-').toLowerCase();
KRIS NIKOLAISEN
KRIS NIKOLAISEN
54,971 Points
KRIS NIKOLAISEN
KRIS NIKOLAISEN
54,971 Points

According to this page : If you are replacing a value (and not a regular expression), only the first instance of the value will be replaced. To replace all occurrences of a specified value, use the global (g) modifier.

For example

string.replace(/str /g, "str-");

would replace all instances of str{space} with str-

Unsubscribed User
Unsubscribed User
852 Points
Unsubscribed User
Unsubscribed User
852 Points

I use split, which works well

[media.showDetail ? 'less': 'more', media.type.split(' ').join('-').toLowerCase()]