dc.js

Namespace: utils

dc. utils

Source:

Methods

<static> add(l, r [, t])

Arbitrary add one value to another.

If the value l is of type Date, adds r units to it. t becomes the unit. For example dc.utils.add(dt, 3, 'week') will add 3 (r = 3) weeks (t= 'week') to dt.

If l is of type numeric, t is ignored. In this case if r is of type string, it is assumed to be percentage (whether or not it includes %). For example dc.utils.add(30, 10) will give 40 and dc.utils.add(30, '10') will give 33.

They also generate strange results if l is a string.

Parameters:
Name Type Argument Default Description
l Date | Number

the value to modify
r String | Number

the amount by which to modify the value
t function | String <optional>
 d3.timeDay

if l is a Date, then this should be a d3 time interval. For backward compatibility with dc.js 2.0, it can also be the name of an interval, i.e. 'millis', 'second', 'minute', 'hour', 'day', 'week', 'month', or 'year'
Source:
Returns:
Type
Date | Number

<static> appendOrSelect(parent, selector, tag)

Append or select an item on a parent element.

Parameters:
Name Type Description
parent d3.selection
selector String
tag String
Source:
Returns:
Type
d3.selection

<static> arraysEqual(a1, a2)

Return true if both arrays are equal, if both array are null these are considered equal

Parameters:
Name Type Description
a1 Array | null
a2 Array | null
Source:
Returns:
Type
Boolean

<static> clamp(val, min, max)

Ensure the value is no greater or less than the min/max values. If it is return the boundary value.

Parameters:
Name Type Description
val any
min any
max any
Source:
Returns:
Type
any

<static> constant(x)

Given x, return a function that always returns x.

d3.functor was removed in d3 version 4. This function helps to implement the replacement, typeof x === "function" ? x : dc.utils.constant(x)

Parameters:
Name Type Description
x any
Source:
Returns:
Type
function

<static> isFloat(n)

Is the value a float?

Parameters:
Name Type Description
n any
Source:
Returns:
Type
Boolean

<static> isInteger(n)

Is the value an integer?

Parameters:
Name Type Description
n any
Source:
Returns:
Type
Boolean

<static> isNegligible(n)

Is the value very close to zero?

Parameters:
Name Type Description
n any
Source:
Returns:
Type
Boolean

<static> isNumber(n)

Is the value a number?

Parameters:
Name Type Description
n any
Source:
Returns:
Type
Boolean

<static> nameToId(name)

Convert a name to an ID.

Parameters:
Name Type Description
name String
Source:
Returns:
Type
String

<static> printSingleValue(filter)

Print a single value filter.

Parameters:
Name Type Description
filter any
Source:
Returns:
Type
String

<static> safeNumber(n)

Return the number if the value is a number; else 0.

Parameters:
Name Type Description
n Number | any
Source:
Returns:
Type
Number

<static> subtract(l, r [, t])

Arbitrary subtract one value from another.

If the value l is of type Date, subtracts r units from it. t becomes the unit. For example dc.utils.subtract(dt, 3, 'week') will subtract 3 (r = 3) weeks (t= 'week') from dt.

If l is of type numeric, t is ignored. In this case if r is of type string, it is assumed to be percentage (whether or not it includes %). For example dc.utils.subtract(30, 10) will give 20 and dc.utils.subtract(30, '10') will give 27.

They also generate strange results if l is a string.

Parameters:
Name Type Argument Default Description
l Date | Number

the value to modify
r String | Number

the amount by which to modify the value
t function | String <optional>
 d3.timeDay

if l is a Date, then this should be a d3 time interval. For backward compatibility with dc.js 2.0, it can also be the name of an interval, i.e. 'millis', 'second', 'minute', 'hour', 'day', 'week', 'month', or 'year'
Source:
Returns:
Type
Date | Number

<static> uniqueId()

Using a simple static counter, provide a unique integer id.

Source:
Returns:
Type
Number