Getting System Fonts Using JavaScript

Several ways to get system fonts using JavaScript. Reference links containing the demo are provided below.

Get system fonts using JavaScript

try {
    // 向页面添加swf并读取字体
    $('body').append('');
    $('#flashcontent').flash({
        "src": "resources/FontList.swf",
        "width": "1",
        "height": "1",
        "swliveconnect": "true",
        "id": "flashfontshelper",
        "name": "flashfontshelper"
    }, { update: false });

    // swf稳定需要超时。
    setTimeout(function() {
        console.log(window.fonts);
        return window.fonts;
    }, _this.settings.flashDelay);
} catch (ex) {
    _this.errors.push('未检测到字体。');
    return fonts;
}

Sample code Another method

try {
    // 向页面添加swf并读取字体
    $('body').append('').flash({
        "src": "resources/fonts.swf",
        "width": "1",
        "height": "1",
        "swliveconnect": "true",
        "id": "flashfontshelper",
        "name": "flashfontshelper"
    }, { update: false });

    // swf稳定需要超时。
    setTimeout(function() {
        var fonts = "",
            obj = document.getElementById("flashfontshelper");

        // 获取字体
        if (obj && typeof(obj.GetVariable) != "undefined") {
          fonts = obj.GetVariable("/:user_fonts").replace(/,/g,", ");
        }
        if (!fonts) {
          fonts = "未检测到Flash或Java字体";
          _this.errors.push('未检测到Flash或Java字体。');
        }
        console.log(fonts);
        return fonts;
    }, 100);
    return true;
} catch (ex) {
    fonts = this.errors.push('未检测到Flash或Java字体。');
}

Error: Uncaught TypeError: The property "fontList" of the object [object Object] is not a function FAQs about system fonts in JavaScript (FAQs)

How to use JavaScript to list all the fonts that a user's browser can display?

JavaScript does not have a built-in method to list all the fonts that the user's browser can display. However, you can use JavaScript libraries like "FontFaceSet" to load and check if the font is available. You can also use the "document.fonts.check()" method to check if a specific font is available. Remember that due to privacy issues, browsers do not allow scripts to directly access the list of installed fonts.

What are cybersecurity fonts and how do you use them in CSS?

Network security fonts are fonts that may exist on various computer systems, so they are very suitable for use on the network. These fonts include Arial, Times New Roman, and Courier New. In CSS you can use these fonts by specifying them in the font-family property. For example, "font-family: Arial, sans-serif;". The browser will use the first font in the list installed on the user's system.

What is the local font access API and how to use it?

Native Font Access API is a Web API that allows you to access fonts installed locally by users. However, this API is not widely supported due to privacy concerns and is generally not recommended. If you still want to use it, you can do it by calling the "navigator.fonts.query()" method, which returns a promise that resolves to a list of FontMetadata objects that represent the user's installed fonts.

How to specify network security fonts using HTML and CSS?

In HTML and CSS, you can specify network security fonts using the "font-family" attribute. You should list the fonts in the order of preferences, separated by commas. The browser will use the first font in the list installed on the user's system. For example, "font-family: Arial, Helvetica, sans-serif;".

How to use JavaScript library to detect fonts installed by users?

There are several available JavaScript libraries that detect fonts installed by the user, such as "FontFaceSet" and "FontDetector". These libraries are by loading the font and then checking if it is available. However, this type of library is not usually recommended due to privacy concerns.

What are the most common network security fonts?

The most common cybersecurity fonts include Arial, Times New Roman, Courier New, Georgia, and Verdana. These fonts are likely to be installed on various computer systems, so they are ideal for use on the network.

How to check if a specific font is installed using JavaScript?

You can use the "document.fonts.check()" method in JavaScript to check if a specific font is installed. This method returns a Boolean value indicating whether the font is available. For example, "document.fonts.check(’16px Arial’)" returns true if Arial is installed.

Can I use JavaScript to directly access the user's installed fonts?

Due to privacy issues, browsers do not allow scripts to directly access the list of installed fonts. However, you can use methods like "document.fonts.check()" to check if a specific font is available.

How to specify alternate fonts in CSS?

In CSS, you can specify alternate fonts by listing multiple fonts (separated by commas) in the 'font-family' property. The browser will use the first font in the list installed on the user's system. If no listed fonts are installed, the browser will use the default font.

What are the privacy issues with accessing fonts installed by the user?

Accessing the fonts that the user has installed can be a privacy concern because it can be used for fingerprint recognition, a technology that allows a website to uniquely identify and track users based on the user's system configuration. Therefore, the browser does not allow scripts to directly access the list of installed fonts.

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