How to target the specific clicked element out of multiple elements with vuejs

Question

Im kinda new to front end in general, especially vue.js. Im trying to make a small application that is going to contain 5 elements, each element is actually getting data from an object with 2 values - name and description. Also each object is in an array.

The name is by default displayed to block and the description by default displayed to none. I want the app to display the description to block whenever i click on the name. Here is the entire code, you can run it on codepen or locally, it will run without a problem. You can ignore everything above the body tag.

<html>
    <head>
        <style>
            *{margin: 0px; padding: 0px; font-family: sans-serif; list-style-type: none; }
            body{background: #003366;}
            #container{width: 1000px; margin: 100px auto;}
            #elements{width: 100%;}
            #elements li{display: inline-block; width: 40%; margin: 40px 5%; background: #FFF; color: #003366; box-shadow: 10px 10px 0px #222; user-select: none;}
            #elements li h1,h3{padding: 10px 20px;}
            #elements li h3{display: none;}
            #elements li h1{cursor: pointer;}
        </style>
        <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/vue.js"></script>
    </head>
    <body>
        <div id="container">
            <ul id='elements'>
                <li v-for="eleObject in eleObjects">
                    <h1 v-on:click="expand" v-text="eleObject.name"></h1>
                    <h3 v-text="eleObject.description"></h3>
                </li>
            </ul>
        </div>
    </body>

    <script>
        let elementList = new Vue({
            el: "#elements",
            data:{
                eleObjects:[
                    {name: "HTML5", description: "Used for front end web development more specifically for building the structure of a website"},
                    {name: "CSS3", description: "Used for giving style to the HTML elements, their positioning and overall look of the website"},
                    {name: "JavaScript 2015", description: "Used for event handling, functionality and dynamics of the website"},
                    {name: "Vue JS", description: "JavaScript framework for component based programming which is used to create more dynamic websites"},
                    {name: "Django.py", description: "Python framewrok used for the backend of the website aka storing data, displaying data templates etc..."}
                ]
            },
            methods:{
                expand: function(){

                }
            }
        });
    </script>
</html>

Belmin Bedak · Accepted Answer · 2018-12-09 17:27:11Z

To achieve desired behaviour, It'd be nice to have some property on object which indicated whether is thing visible or not.

eleObjects:[
    {name: "HTML5", description: "Used for front end web development more specifically for building the structure of a website", visible: false},
    {name: "CSS3", description: "Used for giving style to the HTML elements, their positioning and overall look of the website", visible:  false},
    {name: "JavaScript 2015", description: "Used for event handling, functionality and dynamics of the website", visible: false},
    {name: "Vue JS", description: "JavaScript framework for component based programming which is used to create more dynamic websites", visible: false},
    {name: "Django.py", description: "Python framewrok used for the backend of the website aka storing data, displaying data templates etc...", visible: false}
]

From v-for loop you can get the index, and same index pass to the expand function, so you can access to the clicked element from method.

<li v-for="(eleObject, index) in eleObjects">
    <h1 @click="expand(index)" v-text="eleObject.name"></h1>
    <h3 v-show="eleObject.visible" v-text="eleObject.description"></h3>
</li>

expand method should be rpetty straightforward, we only want to update visible state of clicked element.

expand: function(index){
   this.eleObjects[index].visible = !this.eleObjects[index].visible;
}

Here is the final demo: https://jsbin.com/jiduzoduri/1/edit?html,js,output

Boussadjra Brahim · Accepted Answer · 2018-12-09 17:23:58Z

In the mounted hook you need to alter the eleObjects array items by adding new field called show which is initially false and you use conditional rendering using v-show, then when you click on a specific item it will be expanded

let elementList = new Vue({
  el: "#elements",
  data: {
    eleObjects: [{
        name: "HTML5",
        description: "Used for front end web development more specifically for building the structure of a website"
      },
      {
        name: "CSS3",
        description: "Used for giving style to the HTML elements, their positioning and overall look of the website"
      },
      {
        name: "JavaScript 2015",
        description: "Used for event handling, functionality and dynamics of the website"
      },
      {
        name: "Vue JS",
        description: "JavaScript framework for component based programming which is used to create more dynamic websites"
      },
      {
        name: "Django.py",
        description: "Python framewrok used for the backend of the website aka storing data, displaying data templates etc..."
      }
    ]
  },

  methods: {
    expand: function(el, i) {
      el.show = true;

      this.$set(this.eleObjects, i, el);
    }
  },
  mounted() {
    this.eleObjects = this.eleObjects.map(e => {
      let t = e;
      e.show = false;
      return t;
    });
  }
});

* {
  margin: 0px;
  padding: 0px;
  font-family: sans-serif;
  list-style-type: none;
}

body {
  background: #003366;
}

#container {
  width: 1000px;
  margin: 100px auto;
}

#elements {
  width: 100%;
}

#elements li {
  display: inline-block;
  width: 40%;
  margin: 40px 5%;
  background: #FFF;
  color: #003366;
  box-shadow: 10px 10px 0px #222;
  user-select: none;
}

#elements li h1,
h3 {
  padding: 10px 20px;
}

#elements li h3 {}

#elements li h1 {
  cursor: pointer;
}

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/vue.js"></script>


<body>
  <div id="container">
    <ul id='elements'>
      <li v-for="(eleObject,i) in eleObjects">
        <h1 v-on:click="expand(eleObject,i)" v-text="eleObject.name"></h1>
        <h3 v-text="eleObject.description" v-show="eleObject.show"></h3>
      </li>
    </ul>
  </div>
</body>

eag845 · Accepted Answer · 2018-12-09 17:35:58Z

As you can read in the other answers, you can add a property to see if it is visible or not. Another way is that you can check the css and change it depending on whether it is block ornone

let elementList = new Vue({
  el: "#elements",
  data: {
    eleObjects: [{
        name: "HTML5",
        description: "Used for front end web development more specifically for building the structure of a website"
      },
      {
        name: "CSS3",
        description: "Used for giving style to the HTML elements, their positioning and overall look of the website"
      },
      {
        name: "JavaScript 2015",
        description: "Used for event handling, functionality and dynamics of the website"
      },
      {
        name: "Vue JS",
        description: "JavaScript framework for component based programming which is used to create more dynamic websites"
      },
      {
        name: "Django.py",
        description: "Python framewrok used for the backend of the website aka storing data, displaying data templates etc..."
      }
    ]
  },

  methods: {
    expand: function(e) {
      let h3Element = e.target.nextElementSibling;
      h3Element.style.display = (h3Element.style.display === 'block')? 'none':'block';
    }
  }
});

* {
  margin: 0px;
  padding: 0px;
  font-family: sans-serif;
  list-style-type: none;
}

body {
  background: #003366;
}

#container {
  width: 1000px;
  margin: 100px auto;
}

#elements {
  width: 100%;
}

#elements li {
  display: inline-block;
  width: 40%;
  margin: 40px 5%;
  background: #FFF;
  color: #003366;
  box-shadow: 10px 10px 0px #222;
  user-select: none;
}

#elements li h1,
h3 {
  padding: 10px 20px;
}

#elements li h3 {}

#elements li h1 {
  cursor: pointer;
}

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/vue.js"></script>


<body>
  <div id="container">
    <ul id='elements'>
      <li v-for="(eleObject,i) in eleObjects">
        <h1 v-on:click="expand($event)" v-text="eleObject.name"></h1>
        <h3 v-text="eleObject.description" v-show="eleObject.show"></h3>
      </li>
    </ul>
  </div>
</body>

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