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Change the Orientation of Header Text

You can change the orientation of the header text by using the customAttributes property.

Ensure the following steps:

Step 1:

Create a CSS class with orientation style for the grid header cell.

.orientationcss .e-headercelldiv {
    transform: rotate(90deg);
}

Step 2:

Add the custom CSS class to a particular column by using the customAttributes property.

    { field: 'ShipCity', headerText: 'Ship City', textAlign: 'Center', customAttributes: {class: 'orientationcss'}, width: 80 },

Step 3:

Resize the header cell height by using the following code.

function setHeaderHeight(args) {
    let textWidth: number = document.querySelector(".orientationcss > div").scrollWidth;//Obtain the width of the headerText content.
    let headerCell: NodeList = document.querySelectorAll(".e-headercell");
    for(let i: number = 0; i < headerCell.length; i++) {
        (<HTMLElement>headerCell.item(i)).style.height = textWidth + 'px'; //Assign the obtained textWidth as the height of the headerCell.
    }
}
Source
Preview
index.js
index.css
let grid: Grid = new Grid({
    dataSource: data,
    columns: [
        { field: 'OrderID', headerText: 'Order ID', textAlign: 'Right', width: 100 },
        { field: 'CustomerID', headerText: 'Customer ID', width: 120 },
        { field: 'ShipCity', headerText: 'Ship City', textAlign: 'Center', customAttributes: { class: 'orientationcss' }, width: 80 },
        { field: 'ShipName', headerText: 'Ship Name', width: 100 }
    ],
    created: setHeaderHeight,
    height: 240
});
grid.appendTo('#Grid');

function setHeaderHeight(args) {
    var textWidth = document.querySelector(".orientationcss > div").scrollWidth; // obtain the width of the headerText content.
    var headerCell = document.querySelectorAll(".e-headercell");
    for (var i = 0; i < headerCell.length; i++) {
        (headerCell.item(i)).style.height = textWidth + 'px'; // assign the obtained textWidth as the height of the headerCell.
    }
}
#container {
    visibility: hidden;
}

#loader {
  color: #008cff;
  font-family: 'Helvetica Neue','calibiri';
  font-size: 14px;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}

.orientationcss .e-headercelldiv {
  transform: rotate(90deg);
}