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I am retrieving data from an API that looks like this –

"title": "Company Name",
"markets": "US, Asia",
"market_ids": "4, 5"

I need to add this data to a dropdown menu like this –

<option value="4">US</option>

So I need to remove the commas and any duplicates (there will be many entries with the same market)

I was thinking something like this at first –

      $.ajax({
            method: 'GET',
            url: 'http://localhost:9001/api/directory',
        }).done(function (data, status, xhr) {
            let markets = [];
            $.each(data, function (index, value) {
                markets.push(value.markets);
        })
        markets = [...new Set(markets.toString().split(','))];

        for (market of markets) {
                $(".directory-input.market").append(
                    `<option value="" class="market-option">${market}</option>`)
            };
    });

This works to separate the market names by comma and get rid of any duplicates, but the problem is that I can’t add the market ID to the value. I need the market ID to be accessible as well.

2

Answers


  1. If you have control of the API design, something like

    {
      title: 'Company Name',
      markets: [
        { id: 4, name: 'Asia' },
        { id: 4, name: 'US' }
      ]
    }

    would make usage easier and more clear.

    Given the example though, and making a couple assumptions:

    1. market names are unique
    2. market_ids is ordered same as markets including duplication

    this should work

    $
      .ajax({
        method: 'GET',
        url: 'http://localhost:9001/api/directory',
      })
      .done((data, status, xhr) => {
        const marketSelect = $(".directory-input.market");
        const labels = Array.from(new Set(data.markets.split(', ')));
        const ids = Array.from(new Set(data.market_ids.split(', ')));
        
        labels.forEach(
            (label, idx) => 
                marketSelect.append(`<option value="${ids[idx]}" class="market-option">${label}</option>`)
        );
      });
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  2. Assuming there will be the same number of ids and markets. Note, if you are adding a a lot of options, you probaly will want to create the select itself with options as a documentFragment to avoid repaints.

    const data = { 
    "title": "Company Name",
    "markets": "US, Asia, Asia",
    "market_ids": "4, 5, 5"
    };
    
    const marketSelectEl = document.getElementById('market-select');
    const markets = Array.from(
      new Set(data.markets.split(',').map(m => m.trim()))
      );
    const market_ids =  Array.from(
      new Set(data.markets.split(',').map(m => m.trim()))
      );
    const marketOptions = markets
      .map((marketName, index) => {
        const optionEl = document.createElement('option');
        optionEl.value = market_ids[index];
        optionEl.innerText = marketName;
        return optionEl;
      })
      
      ;
    
    marketOptions.forEach(el => marketSelectEl.append(el));
    <select id="market-select" style="width: 200px;">
    </select>
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