Javascript运行时错误：无法设置未定义或空引用的css Text属性 [英] Javascript runtime error:unable to set css Text property of undefined or null reference

问题描述

Javascript代码：

 function uploadComplete（sender，args）{
 
  //   var imgDisplay = $ get（imgDisplay）;  
  var  imgDisplay = $（' 。imgDisplay'）; 
  //   imgDisplay.src =images / async.gif;  
  var  img =  new  Image（）; 
 img.onload = function（）{
 
 imgDisplay.style.cssText =  高度：50像素;宽度：50像素; 
 imgDisplay.src = img.src; 
}; 
 img.src =  <％= ResolveUrl（UploadFolderPath）％> + args.get_fileName（）; 
} 

这个函数给我错误： Javascript运行时错误：无法设置css Text属性undefined或null参考



告诉我这是什么问题。我该如何解决这个问题

提前谢谢

解决方案

get（imgDisplay）;
var imgDisplay =

（' 。imgDisplay'）;
// imgDisplay.src =images / async.gif;
var img = new Image（）;
img.onload = function（）{

imgDisplay.style.cssText = 高度：50像素;宽度：50像素;
imgDisplay.src = img.src;
};
img.src = <％= ResolveUrl（UploadFolderPath）％> + args.get_fileName（）;
}

这个函数给我错误： Javascript运行时错误：无法设置css Text属性undefined或null参考



告诉我这是什么问题。我怎样才能解决这个问题

提前谢谢

选择器返回的整个包装器对象




Javascript Code:



function uploadComplete(sender, args) {

           //   var imgDisplay = $get("imgDisplay");
           var imgDisplay = $('.imgDisplay');
           //    imgDisplay.src = "images/async.gif";
           var img = new Image();
           img.onload = function () {

               imgDisplay.style.cssText = "height:50px;width:50px";
               imgDisplay.src = img.src;
           };
           img.src = "<%=ResolveUrl(UploadFolderPath) %>" + args.get_fileName();
       }



this function give me the error:Javascript runtime error:unable to set css Text property of undefined or null reference

Tell me whats the problem.and how can i solve this problem
Thanks in advance

解决方案

get("imgDisplay"); var imgDisplay =




('.imgDisplay'); // imgDisplay.src = "images/async.gif"; var img = new Image(); img.onload = function () { imgDisplay.style.cssText = "height:50px;width:50px"; imgDisplay.src = img.src; }; img.src = "<%=ResolveUrl(UploadFolderPath) %>" + args.get_fileName(); }

this function give me the error:Javascript runtime error:unable to set css Text property of undefined or null reference

Tell me whats the problem.and how can i solve this problem
Thanks in advance




The whole wrapper object returned by the selector




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