如何調用JQuery插件內部的函數從插件外部調用？

Question

我正在使用textarea彈性插件JQuery。 這是插件

(function(jQuery){ 
jQuery.fn.extend({ 
    elastic: function() { 

     // We will create a div clone of the textarea 
     // by copying these attributes from the textarea to the div. 
     var mimics = [ 
      'paddingTop', 
      'paddingRight', 
      'paddingBottom', 
      'paddingLeft', 
      'fontSize', 
      'lineHeight', 
      'fontFamily', 
      'width', 
      'fontWeight']; 

     return this.each(function() { 

      // Elastic only works on textareas 
      if (this.type != 'textarea') { 
       return false; 
      } 

      var $textarea = jQuery(this), 
       $twin  = jQuery('<div />').css({'position': 'absolute','display':'none','word-wrap':'break-word'}), 
       lineHeight = parseInt($textarea.css('line-height'),10) || parseInt($textarea.css('font-size'),'10'), 
       minheight = parseInt($textarea.css('height'),10) || lineHeight*3, 
       maxheight = parseInt($textarea.css('max-height'),10) || Number.MAX_VALUE, 
       goalheight = 0, 
       i   = 0; 

      // Opera returns max-height of -1 if not set 
      if (maxheight < 0) { maxheight = Number.MAX_VALUE; } 

      // Append the twin to the DOM 
      // We are going to meassure the height of this, not the textarea. 
      $twin.appendTo($textarea.parent()); 

      // Copy the essential styles (mimics) from the textarea to the twin 
      var i = mimics.length; 
      while(i--){ 
       $twin.css(mimics[i].toString(),$textarea.css(mimics[i].toString())); 
      } 


      // Sets a given height and overflow state on the textarea 
      function setHeightAndOverflow(height, overflow){ 
       curratedHeight = Math.floor(parseInt(height,10)); 
       if($textarea.height() != curratedHeight){ 
        $textarea.css({'height': curratedHeight + 'px','overflow':overflow}); 

       } 
      } 


      // This function will update the height of the textarea if necessary 
      function update() { 

       // Get curated content from the textarea. 
       var textareaContent = $textarea.val().replace(/&/g,'&amp;').replace(/ /g, '&nbsp;').replace(/<|>/g, '&gt;').replace(/\n/g, '<br />'); 

       var twinContent = $twin.html(); 

       if(textareaContent+'&nbsp;' != twinContent){ 

        // Add an extra white space so new rows are added when you are at the end of a row. 
        $twin.html(textareaContent+'&nbsp;'); 

        // Change textarea height if twin plus the height of one line differs more than 3 pixel from textarea height 
        if(Math.abs($twin.height()+lineHeight/3 - $textarea.height()) > 3){ 

         var goalheight = $twin.height()+lineHeight/3; 
         if(goalheight >= maxheight) { 
          setHeightAndOverflow(maxheight,'auto'); 
         } else if(goalheight <= minheight) { 
          setHeightAndOverflow(minheight,'hidden'); 
         } else { 
          setHeightAndOverflow(goalheight,'hidden'); 
         } 

        } 

       } 

      } 

      // Hide scrollbars 
      $textarea.css({'overflow':'hidden'}); 

      // Update textarea size on keyup 
      $textarea.keyup(function(){ update(); }); 
      $textarea.focus(function(){ update(); }); 

      // And this line is to catch the browser paste event 
      $textarea.live('input paste',function(e){ setTimeout(update, 250); });    

      // Run update once when elastic is initialized 
      update(); 

     }); 

    } 
}); 

}）（jQuery）;

我該如何從插件的外部調用更新函數？

Answer 1

它你看的底部，它結合了keyup和focus事件在這裏：

：

$textarea.keyup(function(){ update(); }); 
$textarea.focus(function(){ update(); }); 
//this should be just $textarea.keyup(update); but that's a another question :) 

您可以通過使用.triggerHandler()對任何這些事件處理程序，這樣觸發update()功能

$('textarea').triggerHandler('keyup');