JQuery prev

時間 2019-11-17

標籤 jquery prev 欄目 JQuery 简体版

原文原文鏈接

<html>
<head>
<style type="text/css">
  div,p { 
  	width:110px; 
	height:40px; 
	margin:2px 8px 2px 8px;
        float:left; 
	border:1px blue solid; 
  }
 </style>
<script type="text/javascript" src="jquery.js"></script>
</head>
<body>
  <h1>jQuery prev() example</h1>
 
  <div>This is div 1
     <div>div 1 child</div>
  </div>
  <p>This is paragrah 1</p>
  <div>This is div 2
     <div>div 2 child</div>
  </div>
  <div id="start">This is div 3
     <div>div 3 child</div>
  </div>
 
  <br/><br/><br/>
  <br/><br/><br/>
  <br/><br/><br/>
  <button id="prevButton1">prev()</button>
  <button id="prevButton2">prev('div')</button>
  <button id="prevButton3">prev('p')</button>
  <button id="reset">Reset</button>
 
<script type="text/javascript">
 
    var $currElement = $("#start");
    $currElement.css("background", "red");
 
    $("#prevButton1").click(function () {
 
	  if(!$currElement.prev().length){
	  	alert("No element found!");
		return false;	
	  }
 
	  $currElement = $currElement.prev();
 
      $("div,p").css("background", "");
      $currElement.css("background", "red");
    });
 
    $("#prevButton2").click(function () {
 
	  if(!$currElement.prev('div').length){
	  	alert("No element found!");
		return false;	
	  }
 
	  $currElement = $currElement.prev('div');
 
      $("div,p").css("background", "");
      $currElement.css("background", "red");
    });
 
    $("#prevButton3").click(function () {
 
	  if(!$currElement.prev('p').length){
	  	alert("No element found!");
		return false;	
	  }
 
	  $currElement = $currElement.prev('p');
 
      $("div,p").css("background", "");
      $currElement.css("background", "red");
    });
 
    $("#reset").click(function () {
	  location.reload();
    });
 
</script>
</body>
</html>

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