Turn off Auto Formatted Headers

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You can turn off this auto header behavior with the header-auto-format attribute. You can either disable the auto formatting or attach a custom function to render headers in JavaScript.
Result Full HTML CSS JS
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Full Code

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>ZingGrid: Simple Grid</title>
  <script src="https://cdn.zinggrid.com/zinggrid.min.js" defer></script>
  <style>
    .zg-body {
      background: #e6e6e6;
    }

    zing-grid[loading] {
      height: 746px;
    }
  </style>
</head>

<body class="zg-body">
  <zing-grid header-auto-format="disabled" caption="Auto Formatting Off" layout-controls="disabled" viewport-stop>
    <zg-data data='[
        {
          "playerName": "Eden Hazard",
          "playerClub": "Chelsea",
          "goalsScored": 5          
        },
        {
          "playerName": "Aleksandar Mitrovic",
          "playerClub": "Fulham",
          "goalsScored": 5   
        },
        {
          "playerName": "Sergio Agüero",
          "playerClub": "Manchester City",
          "goalsScored": 4   
        },
        {
          "playerName": "Romelu Lukaku",
          "playerClub": "Manchester United",
          "goalsScored": 4   
        },
        {
          "playerName": "Sadio Mané",
          "playerClub": "Liverpool",
          "goalsScored": 4   
        }
      ]'></zg-data>
  </zing-grid>
  <zing-grid header-auto-format="renderCustomHeaders" caption="Custom Auto Formatting Function" layout-controls="disabled" viewport-stop>
    <zg-data data='[
        {
          "playerName": "Eden Hazard",
          "playerClub": "Chelsea",
          "goalsScored": 5          
        },
        {
          "playerName": "Aleksandar Mitrovic",
          "playerClub": "Fulham",
          "goalsScored": 5   
        },
        {
          "playerName": "Sergio Agüero",
          "playerClub": "Manchester City",
          "goalsScored": 4   
        },
        {
          "playerName": "Romelu Lukaku",
          "playerClub": "Manchester United",
          "goalsScored": 4   
        },
        {
          "playerName": "Sadio Mané",
          "playerClub": "Liverpool",
          "goalsScored": 4   
        }
      ]'></zg-data>
  </zing-grid>
  <script>
    function renderCustomHeaders(originalValue, parsedValue) {
      return `Custom ${parsedValue}`;
    }
  </script>
</body>

</html>
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>ZingGrid: Simple Grid</title>
    <script src="https://cdn.zinggrid.com/zinggrid.min.js" defer></script>
  </head>
  <body class="zg-body">
    <zing-grid 
      header-auto-format="disabled"
      caption="Auto Formatting Off"
      layout-controls="disabled"
      viewport-stop>
      <zg-data 
        data='[
        {
          "playerName": "Eden Hazard",
          "playerClub": "Chelsea",
          "goalsScored": 5          
        },
        {
          "playerName": "Aleksandar Mitrovic",
          "playerClub": "Fulham",
          "goalsScored": 5   
        },
        {
          "playerName": "Sergio Agüero",
          "playerClub": "Manchester City",
          "goalsScored": 4   
        },
        {
          "playerName": "Romelu Lukaku",
          "playerClub": "Manchester United",
          "goalsScored": 4   
        },
        {
          "playerName": "Sadio Mané",
          "playerClub": "Liverpool",
          "goalsScored": 4   
        }
      ]'></zg-data>
    </zing-grid>
    <zing-grid 
      header-auto-format="renderCustomHeaders"
      caption="Custom Auto Formatting Function"
      layout-controls="disabled"
      viewport-stop>
      <zg-data 
        data='[
        {
          "playerName": "Eden Hazard",
          "playerClub": "Chelsea",
          "goalsScored": 5          
        },
        {
          "playerName": "Aleksandar Mitrovic",
          "playerClub": "Fulham",
          "goalsScored": 5   
        },
        {
          "playerName": "Sergio Agüero",
          "playerClub": "Manchester City",
          "goalsScored": 4   
        },
        {
          "playerName": "Romelu Lukaku",
          "playerClub": "Manchester United",
          "goalsScored": 4   
        },
        {
          "playerName": "Sadio Mané",
          "playerClub": "Liverpool",
          "goalsScored": 4   
        }
      ]'></zg-data>
    </zing-grid>
  </body>
</html>
.zg-body {background:#e6e6e6;}
function renderCustomHeaders(originalValue, parsedValue) {
  return `Custom ${parsedValue}`;
}

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