Javascript gets the method code for the selected text

  • 2020-03-26 21:40:40
  • OfStack


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> new document </title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style>
body { font-size:12px; }
#show { background-color:#CCFF99; }
</style>
</head>
<body>   
<textarea id="content" cols="30" rows="10">
 River fish mysteriously dead, downstream residents frequent strange disease, coastal plants continue to mutate, is residual pesticides? A biological attack? Stay tuned for tonight CCTV-10 "The quest for science," the upcoming feature: "the mysterious river foot washer. -- China men's football - 
</textarea>   
<button id="btn"> Get the selected value </button>
<div id="show"></div>
<script>   
    String.prototype.trim = function() {    
         return this.replace(/^s+|s+$/g, "");    
     } 
  
     function getSelectText() {   
        try{
            // IE: document.selection.createRange() W3C:window.getSelection()
            var selectText = (document.selection && document.selection.createRange )? document.selection.createRange().text : window.getSelection().toString();
            if(selectText != null && selectText.trim() != ""){
               return selectText;
            }
        }catch(err){}
     }      
 
 function getSelectText2(id) {
  var t = document.getElementById(id);
  if(window.getSelection) {
   if(t.selectionStart != undefined && t.selectionEnd != undefined) {
    return t.value.substring(t.selectionStart, t.selectionEnd);
   } else {
    return "";
   }
  } else {
   return document.selection.createRange().text;
  }
  }
  document.getElementById('btn').onclick = function() {
   document.getElementById('show').innerHTML = getSelectText2('content');
  }
</script>
</body>   
</html>   


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