How to loop through a sub array in a Json array in Vue Js?

Question

I am having a JSON data array, I need to loop through outer as well as inner subarray and need to create a Table. Below is the sample array

    {
        class:'I',
        subDdiv:[
            {
                div: 'A',
                subjects:['Subject1','Subject2','Subject3']
            },
            {
                div: 'B',
                subjects:['Subject1','Subject2','Subject3']
            },   
        ]
}
    {
        class:'II',
        subDdiv:[
            {
                div: 'A',
                subjects:['Subject1','Subject2','Subject3']
            },
            {
                div: 'B',
                subjects:['Subject1','Subject2','Subject3']
            },   
        ]
}

Now I need to create a table with the row heading as Class and Div

labels :['class','div']

The code i written is not giving actual results,

<el-table :data="array" style="width: 100%">
  <el-table-column v-for="label in labels" :key="label"
   :prop="label"
   :label="label">
   </el-table-column>
 </el-table>

Note: i am using Element Ui Table -https://element.eleme.io/#/en-US/component/table

I need to have a table like this

But the table I got is

Please help me to loop through inner subDiv and create the table. code box -https://codesandbox.io/s/vigilant-wildflower-zgiq2?file=/src/App.vue

div itself in an array. I guess you need to iterate subDdiv. — Muhammad Lahin
– Muhammad Lahin, Commented May 9, 2020 at 8:22
@palaѕн please use this codesandbox - codesandbox.io/s/vigilant-wildflower-zgiq2?file=/src/App.vue — Manu
– Manu, Commented May 9, 2020 at 9:18

Igor Moraru · Accepted Answer · 2020-05-09 10:07:00Z

1

To be able to loop the data in one loop (which is what the layout you are using require) you should flatten your data:

computed: {
    reducedArray() {
      return this.dataArray.reduce((prev, obj) => {
        let flatted = obj.subDdiv.map(item => {
          let subdiv = {};
          subdiv["class"] = obj.class;
          subdiv["div"] = item.div;
          return subdiv
        });
        return [...prev, ...flatted];
      }, []);
    }
  }

Then you can use your code as is, by looping the flatted array:

<el-table :data="reducedArray" style="width: 100%">
      <el-table-column v-for="label in labels" :key="label" :prop="label" :label="label"></el-table-column>
</el-table>

answered May 9, 2020 at 10:07

Igor Moraru

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Comments

ajobi · Accepted Answer · 2020-05-09 09:25:16Z

I have built a quick example with pure HTML tables, it should give you an idea about how you can achieve the same result with your UI components library too.

new Vue({
  el: "#app",
  data: {
    contents: [
     {
        class:'I',
        subDdiv:[
            {
                div: 'A',
                subjects:['Subject1','Subject2','Subject3']
            },
            {
                div: 'B',
                subjects:['Subject1','Subject2','Subject3']
            },   
        ]
},
    {
        class:'II',
        subDdiv:[
            {
                div: 'A',
                subjects:['Subject1','Subject2','Subject3']
            },
            {
                div: 'B',
                subjects:['Subject1','Subject2','Subject3']
            },   
        ]
}
    ]
   }
})

td, th {
  padding: 5px 20px;
}

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

<div id="app">
  <table>
    <thead>
      <tr>
        <th>Class</th>
        <th>Div</th>
      </tr>
    </thead>
    <tbody>
      <template v-for="item in contents">
        <tr v-for="subItem in item.subDdiv">
          <td> {{ item.class }} </td>
          <td> {{ subItem.div }} </td>
        </tr>
      </template>
    </tbody>
  </table>
</div>

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