在angularjs中擴展幫助函數

Question

我想用angularjs處理幫助函數（.closest()等），但我不知道該怎麼做。

我的目標：

let el = e => angular.element(e); 

el('#selector').helperFunction(); 
el('.selector').closest('.parent'); 

小例子使用jQuery：

jQuery.fn.extend({ 
    helperFunction: function() { 
     // do stuff... 
    } 
}); 

$('#selector').helperFunction(); 

我怎麼能做到這一點與angularjs？

Answer 1

這裏是一個辦法做到這一點：

let el = e => angular.element(e); 

angular.element.prototype.closest = function (selector) { 
    if (typeof selector === 'string' && (/^(#|\.).+$/.test(selector) || (/^(a|abbr|acronym|address|applet|area|article|aside|audio|b|base|basefont|bdi|bdo|big|blockquote|body|br|button|canvas|caption|center|cite|code|col|colgroup|datalist|dd|del|details|dfn|dialog|dir|div|dl|dt|em|embed|fieldset|figcaption|figure|font|footer|form|frame|frameset|h1|h2|h3|h4|h5|h6|head|header|hr|html|i|iframe|img|input|ins|kbd|keygen|label|legend|li|link|main|map|mark|menu|menuitem|meta|meter|nav|noframes|noscript|object|ol|optgroup|option|output|p|param|pre|progress|q|rp|rt|ruby|s|samp|script|section|select|small|source|span|strike|strong|style|sub|summary|sup|table|tbody|td|textarea|tfoot|th|thead|time|title|tr|track|tt|u|ul|var|video|wbr)$/.test(selector)))) { 
     if (selector.startsWith('#')) { 
      // finding via id 

      let id = selector.substring(1, selector.length), parent = el(this).parent(); 

      while (parent.length) { 
       if (parent.prop('id') === id) return parent; 
       parent = parent.parent() 
      }  
     } else if (selector.startsWith('.')) { 
      // finding via class name 

      let class_name = selector.substring(1, selector.length), parent = el(this).parent(); 

      while (parent.length) { 
       if (parent.hasClass(class_name)) return parent; 
       parent = parent.parent() 
      } 
     } else { 
      // finding via tag name 

      let parent = el(this).parent(); 

      while (parent.length) { 
       if (parent.prop('tagName') && parent.prop('tagName').toLowerCase() === selector.toLowerCase()) return parent; 
       parent = parent.parent() 
      } 
     } 
    }  
    return undefined 
}; 

然後：

el('#selector').closest('#parent').css('color', '#f00'); 
el('#selector').closest('.parent').css('color', '#f00'); 
el('#selector').closest('div').css('color', '#f00');