SVGLengthList: 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 January 2020.

The insertItemBefore() method of the SVGLengthList interface inserts a new item into the list at the specified position. The first item is indexed 0. The inserted item is the item itself and not a copy.

  • If the new item 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 insert before is before the removal of the item.
  • If the index is equal to 0, then the new item is inserted at the front of the list.
  • If the index is greater than or equal to the length, then the new item is appended to the end of the list.

Syntax

js
insertItemBefore(newItem, index)

Parameters

newItem

The SVGLength to add to the list.

index

A non-negative integer that specifies the index of the item to insert the new item before.

Return value

The SVGLength that was added to the list.

Exceptions

DOMException NoModificationAllowedError

Thrown when the list is read-only.

Examples

See SVGLengthList for a complete example.

Specifications

Specification
Scalable Vector Graphics (SVG) 2
# __svg__SVGNameList__insertItemBefore

Browser compatibility

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