SVGTransformList: insertItemBefore() method
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The insertItemBefore() method of the SVGTransformList interface inserts a new item into the list at the specified position.
The first item is indexed at 0. The inserted item is the item itself and not a copy.
-
If
newItemis 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
indexof the item to insert before is before the removal of the item. -
If the
indexis equal to0, then the new item is inserted at the front of the list. -
If the
indexis greater than or equal tonumberOfItems, then the new item is appended to the end of the list.
Syntax
insertItemBefore(newItem, index)
Parameters
newItem-
An
SVGTransformitem that is inserted into the list. index-
An
integer; the index where the new item should be inserted as an unsigned long.
Return value
An SVGTransform object; the inserted item from the list.
Exceptions
NoModificationAllowedErrorDOMException-
Thrown if
SVGTransformListcorresponds to a read-only attribute or when the object itself is read-only.
Examples
Inserting a Transformation into the List
<svg width="200" height="200" id="mySvg">
<rect width="100" height="100" fill="blue" />
</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 translate transformation
const translateTransform = svgElement.createSVGTransform();
translateTransform.setTranslate(50, 50);
// Insert the translation transformation at the beginning of the list
transformList.insertItemBefore(translateTransform, 0);
// The transformation list length and type
console.log(`Number of transformations: ${transformList.length}`); // Output: 1
console.log(`Transformation Type: ${transformList.getItem(0).type}`); // Output: 2 (e.g. SVG_TRANSFORM_TRANSLATE)
Specifications
| Specification |
|---|
| Scalable Vector Graphics (SVG) 2 # __svg__SVGNameList__insertItemBefore |
Browser compatibility
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- Full support
- Full support