SVGTransformList: replaceItem() method

The replaceItem() method of the SVGTransformList interface replaces an existing item in the list with a new item.

The inserted item is the item itself and not a copy.

If newItem is already in a list, it is removed from its previous list before it is inserted into this list.
If the item is already in this list, note that the index of the item to replace is before the removal of the item.

Syntax

replaceItem(newItem, index)

Parameters

newItem: A SVGTransform item that is inserted into the list.
index: An integer; the index where the new item should replace the existing one, as an unsigned long.

Return value

An SVGTransform object; the inserted item from the list.

Exceptions

This method may raise a DOMException of one of the following types:

NoModificationAllowedError DOMException: Thrown if SVGTransformList corresponds to a read-only attribute or when the object itself is read-only.
IndexSizeError DOMException: Thrown if the index number is greater than or equal to numberOfItems.

Examples

undefined

Replacing a Transformation in the List

html

<svg width="200" height="200" id="mySvg">
  <rect width="100" height="100" fill="blue" transform="translate(50,50)" />
</svg>

const svgElement = document.querySelector("svg");
const rectElement = svgElement.querySelector("rect");

// Access the transform list of the <rect> element
const transformList = rectElement.transform.baseVal;

// Create a new rotation transformation
const rotateTransform = svgElement.createSVGTransform();
rotateTransform.setRotate(45, 50, 50);

transformList.replaceItem(rotateTransform, 0);

// Log the details of the new transformation
console.log(`New Transformation Type: ${transformList.getItem(0).type}`); // Output: 4 (e.g. SVG_TRANSFORM_ROTATE)

Specifications

Scalable Vector Graphics (SVG) 2