JS implements gray text prompts in the input box-JS Tutorial-php.cn

JS implements gray text prompts in the input box

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Release： 2018-06-07 11:32:36

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This time I will bring you JS to implement gray text prompts in the input box. What are the precautions for JS to implement gray text prompts in the input box? The following is a practical case, let's take a look.

How to achieve the placeholder attribute effect of html through js

We need to do this:

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>JS实现placeholder属性效果</title>
    <script>
      function bl(){
        var a=document.getElementById("inpt");
        if(a.value.length<=0){
          a.style.color="#999999";
          a.value="请输入姓名";
        }
      }
      function fo(){
        var a=document.getElementById("inpt");
        if(a.value=="请输入姓名"){
          a.style.color="black";
          a.value="";
        }
      }
    </script>
  </head>
  <body>
    <input style="color: #999999;" value="请输入姓名" id="inpt" type="text" onblur="bl()" onfocus="fo()" />
  </body>
</html>

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Supplement:

Here is another example of the placeholder attribute effect implemented by jQuery:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>jQuery实现placeholder属性效果</title>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
</head>
<body>
<input style="color: #999999;" data-value="请输入姓名" id="inpt" type="text"/>
<script>
function placeHolder(event){
 var self = $(this), selfDataValue = self.attr("data-value"), selfValue = self.val();
 if(selfDataValue){
  event.type == "click" ? (selfValue == selfDataValue && (self.val("").css("color","#333"))) : (event.type == "blur" && (selfValue == "" && (self.val(selfDataValue).css("color","#A9A9A9"))))
 }else{
  return false;
 }
}
$("#inpt").on("click blur",placeHolder);
</script>
</body>
</html>

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I believe you have read this article You have mastered the case method. For more exciting information, please pay attention to other related articles on the PHP Chinese website!