This library allows to load Google Fonts exhibited at fonts.googleapis.com.
Include the gfloader.js file in your webpage. This library only works in
browsers, it is not intended to run in NodeJS or similar. We recommend to use
some process and minify the library before serving in production. Remember to
preserve the copyright notice, as required by MIT License.
Appends a font CSS given its family. If you want to load the default font style (weight 400, latin), just pass the font name to this function. The "family" argument also accepts an object with the fields:
family(String) with the family name (case sensitive);weight(Number or Array) with the weight or an array of weights;subset(String or Array) with the character subset of the family.
The function returns a Promise object and you can define its callback calling
the functions .then(callback) or .catch(callback).
The .then(callback)'s first argument contains some useful information for the
current query, that matches the style of GFLoader.info. The argument contains
an object with weight (Array) and subset (Array) filled with the items actually
retrieved from the font server.
Detect whether the font family exists or not. This function makes a HEAD request in the Google Fonts server and watch its result. If it returns 200 OK, the font exists.
Argument family (String) is the font family to check. It is a case-sensitive
string with the name of the font family.
The function returns a Promise to handle its result.
There is no way to differenciate the result of a network error from an invalid font family. This occurs because both cases returns an invalid error with status 0. While Google Fonts API sends an HTTP 400, the cross-origin policy intercepts the error page and converts the status to 0. This status is ambiguous with other possible errors.
GFLoader.exists_weight(family, weight): Promise
This function is very like the exists function, but also accept an extra
argument to test against a specific font weight.
Argument weight accepts the font weight as string or number. It also can be an
array with strings and numbers representing the desired font weights. If the
argument is an array, it will return true whether any of the weights exist.
The function returns a Promise to handle its result.
See exists function for further information.
Returns some useful informations about the font family. When the execution goes
well, the first argument passed to the callback function of .then(callback) is
an object with the fields weight and subset.
Field weight holds a plain object that maps the font weight and its ability to
be normal and/or italic. Each weight is an object with the fields normal and
italic. In other hand, field subset stores the valid character subsets. Each
item is a field of the subset object, whose field name is the subset and the
field value is always true.
Load the font CSS, if necessary, and set the inline style attribute on the
given element, adjusting its font-family and font-weight.
The element argument can be anything that jQuery can turns into an object or
group of objects. If no element can be retrieved, the function has the same
effect as append.
The family element can be a string or object, like the append function.
Argument fallback accepts "sans-serif", "serif" or "monospace".
The function returns a Promise to handle its success or fail.