Namespace: dom

Blockly.utils.dom

namespace   static

Enumeration

NodeType

static

number

Node type constants. https://developer.mozilla.org/en-US/docs/Web/API/Node/nodeType

Value
ELEMENT_NODE
TEXT_NODE
COMMENT_NODE
DOCUMENT_POSITION_CONTAINED_BY

Properties

HTML_NS

constant   static

Required name space for HTML elements.

NodeType

static

number

Node type constants. https://developer.mozilla.org/en-US/docs/Web/API/Node/nodeType

Value
ELEMENT_NODE
TEXT_NODE
COMMENT_NODE
DOCUMENT_POSITION_CONTAINED_BY

SVG_NS

constant   static

Required name space for SVG elements.

XLINK_NS

constant   static

Required name space for XLINK elements.

Methods

addClass

static

addClass(element, className) returns boolean

Add a CSS class to a element. Similar to Closure's goog.dom.classes.add, except it handles SVG elements.

Parameter
element	Element DOM element to add class to. Value must not be null.
className	string Name of class to add.

Returns

boolean True if class was added, false if already present.

containsNode

static

containsNode(parent, descendant) returns boolean

Whether a node contains another node.

Parameter
parent	Node The node that should contain the other node. Value must not be null.
descendant	Node The node to test presence of. Value must not be null.

Returns

boolean Whether the parent node contains the descendant node.

createSvgElement

static

createSvgElement(name, attrs, opt_parent) returns T

Helper method for creating SVG elements.

Parameter
name	(string or Blockly.utils.Svg containing T) Element's tag name.
attrs	Object Dictionary of attribute names and values. Value must not be null.
opt_parent	Optional Element Optional parent on which to append the element.

Returns

T Newly created SVG element. The return type is {!SVGElement} if name is a string or a more specific type if it a member of Blockly.utils.Svg

getFastTextWidth

static

getFastTextWidth(textElement, fontSize, fontWeight, fontFamily) returns number

Gets the width of a text element using a faster method than getTextWidth. This method requires that we know the text element's font family and size in advance. Similar to getTextWidth, we cache the width we compute.

Parameter
textElement	Element An SVG 'text' element. Value must not be null.
fontSize	number The font size to use.
fontWeight	string The font weight to use.
fontFamily	string The font family to use.

Returns

number Width of element.

getFastTextWidthWithSizeString

static

getFastTextWidthWithSizeString(textElement, fontSize, fontWeight, fontFamily) returns number

Gets the width of a text element using a faster method than getTextWidth. This method requires that we know the text element's font family and size in advance. Similar to getTextWidth, we cache the width we compute. This method is similar to getFastTextWidth but expects the font size parameter to be a string.

Parameter
textElement	Element An SVG 'text' element. Value must not be null.
fontSize	string The font size to use.
fontWeight	string The font weight to use.
fontFamily	string The font family to use.

Returns

number Width of element.

getTextWidth

static

getTextWidth(textElement) returns number

Gets the width of a text element, caching it in the process.

Parameter
textElement	Element An SVG 'text' element. Value must not be null.

Returns

number Width of element.

hasClass

static

hasClass(element, className) returns boolean

Checks if an element has the specified CSS class. Similar to Closure's goog.dom.classes.has, except it handles SVG elements.

Parameter
element	Element DOM element to check. Value must not be null.
className	string Name of class to check.

Returns

boolean True if class exists, false otherwise.

insertAfter

static

insertAfter(newNode, refNode)

Insert a node after a reference node. Contrast with node.insertBefore function.

Parameter
newNode	Element New element to insert. Value must not be null.
refNode	Element Existing element to precede new node. Value must not be null.

measureFontMetrics

static

measureFontMetrics(text, fontSize, fontWeight, fontFamily) returns Object

Measure a font's metrics. The height and baseline values.

Parameter
text	string Text to measure the font dimensions of.
fontSize	string The font size to use.
fontWeight	string The font weight to use.
fontFamily	string The font family to use.

Returns

{height: number, baseline: number} Font measurements.

removeClass

static

removeClass(element, className) returns boolean

Remove a CSS class from a element. Similar to Closure's goog.dom.classes.remove, except it handles SVG elements.

Parameter
element	Element DOM element to remove class from. Value must not be null.
className	string Name of class to remove.

Returns

boolean True if class was removed, false if never present.

removeClasses

static

removeClasses(element, classNames)

Removes multiple calsses from an element.

Parameter
element	Element DOM element to remove classes from. Value must not be null.
classNames	string A string of one or multiple class names for an element.

removeNode

static

removeNode(node) returns Node

Removes a node from its parent. No-op if not attached to a parent.

Parameter
node	Node The node to remove. Value may be null.

Returns

nullable Node The node removed if removed; else, null.

setCssTransform

static

setCssTransform(element, transform)

Sets the CSS transform property on an element. This function sets the non-vendor-prefixed and vendor-prefixed versions for backwards compatibility with older browsers. See https://caniuse.com/#feat=transforms2d

Parameter
element	Element Element to which the CSS transform will be applied. Value must not be null.
transform	string The value of the CSS transform property.

startTextWidthCache

static

startTextWidthCache()

Start caching text widths. Every call to this function MUST also call stopTextWidthCache. Caches must not survive between execution threads.

stopTextWidthCache

static

stopTextWidthCache()

Stop caching field widths. Unless caching was already on when the corresponding call to startTextWidthCache was made.