检查Typekit是否已加载JavaScript

Question

我目前正在使用jQuery构建一个动画布局，并且我正在使用.width()找出div的宽度。但是，有时它会在TypeKit被激活之前获取.width() (因此给出了错误的宽度)。

有没有办法通过使用if statement来检查TypeKit何时加载

Answer 1

是的，有。

您可以使用带回调的Typekit.load (docs)，而不是在head标记中调用常用的try{Typekit.load();}catch(e){}：

try {
  Typekit.load({
    loading: function() {
      // JavaScript to execute when fonts start loading
    },
    active: function() {
      // JavaScript to execute when fonts become active
      // this is where you want to init your animation stuff
    },
    inactive: function() {
      // JavaScript to execute when fonts become inactive
    }
  })
} catch(e) {}

我只是为我自己的项目做了这件事，我没有能力改变代码。因此，如果你处于同样的情况，试试这个：

// configure these
var check_interval = 100; // how many ms to leave before checking again
var give_up_after_ms = 2000; // how many ms before we consider the page loaded anyway.

// caches etc
var count = 0;
var count_limit = give_up_after_ms / check_interval;
var html = $("html");
var font_loaded_check_interval;

var check_load_status = function(callback) {

    if(html.hasClass("wf-active") || count >= count_limit) {

        // fonts are loaded or give_up_after_ms was reached

        if(font_loaded_check_interval) {
            clearInterval(font_loaded_check_interval);
            font_loaded_check_interval = null;
        }

        // call the callback
        callback.call(this);
        return true;

    }

    count++;
    return false;

};

function doneCallback() {
    // code to run when fonts are loaded or timeout reached
    alert("Done");
}

// check on initial run of JS, and if not ready, start checking at regular intervals. 
if( ! check_load_status(doneCallback)) {
    font_loaded_check_interval = setInterval(function() {
        check_load_status(doneCallback);
    }, check_interval);
}