src/jvectormap.js

/**
 * @namespace jvm Holds core methods and classes used by jVectorMap.
 */
var jvm = {

  /**
   * Inherits child's prototype from the parent's one.
   * @param {Function} child
   * @param {Function} parent
   */
  inherits: function(child, parent) {
    function temp() {}
    temp.prototype = parent.prototype;
    child.prototype = new temp();
    child.prototype.constructor = child;
    child.parentClass = parent;
  },

  /**
   * Mixes in methods from the source constructor to the target one.
   * @param {Function} target
   * @param {Function} source
   */
  mixin: function(target, source){
    var prop;

    for (prop in source.prototype) {
      if (source.prototype.hasOwnProperty(prop)) {
        target.prototype[prop] = source.prototype[prop];
      }
    }
  },

  min: function(values){
    var min = Number.MAX_VALUE,
        i;

    if (values instanceof Array) {
      for (i = 0; i < values.length; i++) {
        if (values[i] < min) {
          min = values[i];
        }
      }
    } else {
      for (i in values) {
        if (values[i] < min) {
          min = values[i];
        }
      }
    }
    return min;
  },

  max: function(values){
    var max = Number.MIN_VALUE,
        i;

    if (values instanceof Array) {
      for (i = 0; i < values.length; i++) {
        if (values[i] > max) {
          max = values[i];
        }
      }
    } else {
      for (i in values) {
        if (values[i] > max) {
          max = values[i];
        }
      }
    }
    return max;
  },

  keys: function(object){
    var keys = [],
        key;

    for (key in object) {
      keys.push(key);
    }
    return keys;
  },

  values: function(object){
    var values = [],
        key,
        i;

    for (i = 0; i < arguments.length; i++) {
      object = arguments[i];
      for (key in object) {
        values.push(object[key]);
      }
    }
    return values;
  },

  whenImageLoaded: function(url){
    var deferred = new jvm.$.Deferred(),
        img = jvm.$('<img/>');

    img.on('error', function(){
      deferred.reject();
    }).on('load', function(){
      deferred.resolve(img);
    });
    img.attr('src', url);

    return deferred;
  },

  isImageUrl: function(s){
    return /\.\w{3,4}$/.test(s);
  }
};

jvm.$ = jQuery;

/**
 * indexOf polyfill for IE < 9
 * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf
 */
if (!Array.prototype.indexOf) {
  Array.prototype.indexOf = function (searchElement, fromIndex) {

    var k;

    // 1. Let O be the result of calling ToObject passing
    //    the this value as the argument.
    if (this == null) {
      throw new TypeError('"this" is null or not defined');
    }

    var O = Object(this);

    // 2. Let lenValue be the result of calling the Get
    //    internal method of O with the argument "length".
    // 3. Let len be ToUint32(lenValue).
    var len = O.length >>> 0;

    // 4. If len is 0, return -1.
    if (len === 0) {
      return -1;
    }

    // 5. If argument fromIndex was passed let n be
    //    ToInteger(fromIndex); else let n be 0.
    var n = +fromIndex || 0;

    if (Math.abs(n) === Infinity) {
      n = 0;
    }

    // 6. If n >= len, return -1.
    if (n >= len) {
      return -1;
    }

    // 7. If n >= 0, then Let k be n.
    // 8. Else, n<0, Let k be len - abs(n).
    //    If k is less than 0, then let k be 0.
    k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);

    // 9. Repeat, while k < len
    while (k < len) {
      // a. Let Pk be ToString(k).
      //   This is implicit for LHS operands of the in operator
      // b. Let kPresent be the result of calling the
      //    HasProperty internal method of O with argument Pk.
      //   This step can be combined with c
      // c. If kPresent is true, then
      //    i.  Let elementK be the result of calling the Get
      //        internal method of O with the argument ToString(k).
      //   ii.  Let same be the result of applying the
      //        Strict Equality Comparison Algorithm to
      //        searchElement and elementK.
      //  iii.  If same is true, return k.
      if (k in O && O[k] === searchElement) {
        return k;
      }
      k++;
    }
    return -1;
  };
}