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利用Angularjs和原生JS分别实现动态效果的输入框

时间：2021-09-25 01:58 编辑：来源：阅读：
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摘要：利用Angularjs和原生JS分别实现动态效果的输入框

[b]在刚开始没有给输入框添加焦点之前，没有任何效果。见下图：[/b] [img]http://files.jb51.net/file_images/article/201609/20169193733267.png?20168193743[/img] [b]然后点击其中任何一个，焦点就会触发一个动画，动画的结果见图二：[/b] [img]http://files.jb51.net/file_images/article/201609/20169193803926.png?20168193812[/img] 中间的输入登录密码文字，会自动添加到顶部（原谅我没有截取到动画过程的图片）。我测试了一下，这样的效果只有高级浏览器支持（IE只有IE10、IE11、Edge支持）。下面我来把代码贴上来，原理很简单，就是通过事件触发类名的增加和删除。具体的动画由CSS3来实现，这也是为什么低级浏览器不支持的原因。 [b]原生JS实现示例：[/b]

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title></title>
 <style>
 *{
  padding: 0;
  margin: 0;
 }
 .demo{
  border: 1px solid gray;
  width: 300px;
  height: 200px;
  position: relative;
  left: 200px;
  top: 200px;
  -webkit-transition: all 0.3s linear;
  -moz-transition: all 0.3s linear;
  -ms-transition: all 0.3s linear;
  -o-transition: all 0.3s linear;
  transition: all 0.3s linear;
 }
 .demo input{
  width: 200px;
  height: 100px;
  position: absolute;
  left: 50px;
  top: 50px;
  -webkit-transition: all 0.3s linear;
  -moz-transition: all 0.3s linear;
  -ms-transition: all 0.3s linear;
  -o-transition: all 0.3s linear;
  transition: all 0.3s linear;
 }
 .demo label{
  position: absolute;
  top: 100px;
  left:80px;
  font-size: 14px;
  -webkit-transition: all 0.3s linear;
  -moz-transition: all 0.3s linear;
  -ms-transition: all 0.3s linear;
  -o-transition: all 0.3s linear;
  transition: all 0.3s linear;
 }
 .activeDemo{
  border: 1px #fd715a solid;
  -webkit-transition: all 0.3s ease;
  -moz-transition: all 0.3s ease;
  -ms-transition: all 0.3s ease;
  -o-transition: all 0.3s ease;
  transition: all 0.3s ease;
 }
 .activeInput{
  border: 1px #fd715a solid;
  -webkit-transition: all 0.3s ease;
  -moz-transition: all 0.3s ease;
  -ms-transition: all 0.3s ease;
  -o-transition: all 0.3s ease;
  transition: all 0.3s ease;
 }
 .activeLabel{
  font-size: 10px;
  color: #fd715a;
  background: white;
  -webkit-transform: translate(-20px, -58px);
  -moz-transform: translate(-20px, -58px);
  -ms-transform: translate(-20px, -58px);
  -o-transform: translate(-20px, -58px);
  transform: translate(-20px, -58px);
  -webkit-transition: all 0.3s linear;
  -moz-transition: all 0.3s linear;
  -ms-transition: all 0.3 linear;
  -o-transition: all 0.3s linear;
  transition: all 0.3s linear;
 }

 </style>
</head>
<body>
 <div class="demo">
 <input type="text" id="inputDemo"/>
 <label for="inputDemo">请输入内容</label>
 </div>
</body>
<script>
 var addEvent= function (obj,event,callback) {
 if(obj.addEventListener){
  obj.addEventListener(event,callback)
 }else if(obj.attachEvent){
  obj.attachEvent('on'+event,callback)
 }
 };
 var demo=document.querySelector(".demo");

 var input=document.querySelector("#inputDemo");
 var label=document.querySelector(".demo label");
 addEvent(input,"focus", function () {
 demo.className+=" activeDemo";
 this.className+=" activeInput";
 label.className+=" activeLabel";
 });
 addEvent(input,'blur', function () {
 this.className=this.className.replace(/\s*activeInput\s*/,' ');
 label.className=label.className.replace(/\s*activeLabel\s*/,' ');
 demo.className=demo.className.replace(/\s*activeDemo\s*/,' ');
 })
</script>
</html>

下面是用Angular实现的一个简单的效果，原理很简单，就是在指令中通操作DOM来实现动画。 [b]Angularjs实现示例：[/b]

<!DOCTYPE html>
<html lang="en" ng-app="formAnimation">
<head>
 <meta charset="UTF-8">
 <title></title>
 <script src="lib/angular.min.js" type="text/javascript"></script>
 <script src="lib/angular-animate.js" type="text/javascript"></script>
 <style>
 *{
  padding: 0;
  margin: 0;
 }
 .container{
  width: 445px;
  height: 370px;
  border-left: 10px solid #d4d4d4;
  position: relative;
  left: 100px;
  top: 100px;
 }
 .container input{
  position: absolute;
  top: 100px;
  left: 25px;
  height: 40px;
  width: 385px;
 }
 .container span{
  width: 80px;
  height: 25px;
  font-size: 10px;
  background: rgb(237,97,83);
  color: white;
  position: absolute;
  left: 300px;
  top: 109px;
  line-height: 25px;
  text-align: center;
 }
 .container .labelStyle{
  position: absolute;
  left: 45px;
  top: 115px;
  font-size: 14px;
  color: #929292;
  z-index: 999;
  font: "Helvetica Neue", Helvetica, Arial, sans-serif;
  -webkit-transition: all 0.2s ease;
  -moz-transition: all 0.2s ease;
  -ms-transition: all 0.2s ease;
  -o-transition: all 0.2s ease;
  transition: all 0.2s ease;
 }
 .inputActive{
  border: 2px solid rgb(237,97,90);
  -webkit-transition: all 0.2s ease;
  -moz-transition: all 0.2s ease;
  -ms-transition: all 0.2s ease;
  -o-transition: all 0.2s ease;
  transition: all 0.2s ease;
 }
 .labelActive{
  position: absolute;
  left: 45px;
  top: 115px;
  z-index: 999;
  background: white;
  border: 2px solid white;
  color: rgb(237,97,90);
  font-size: 10px;
  -webkit-transform: translate(-10px, -23px);
  -moz-transform: translate(-10px, -23px);
  -ms-transform: translate(-10px, -23px);
  -o-transform: translate(-10px, -23px);
  transform: translate(-10px, -23px);
  -webkit-transition: all 0.2s ease;
  -moz-transition: all 0.2s ease;
  -ms-transition: all 0.2s ease;
  -o-transition: all 0.2s ease;
  transition: all 0.2s ease;
 }
 </style>
</head>
<body ng-controller="formAnimationController">
 <form action="" class="container" form-animation>
 <label for="inputDemo" class="labelStyle">请输入内容</label>
 <input type="text" id="inputDemo" />
 <span>请填写内容</span>
 </form>
</body>
<script>
 angular.module('formAnimation',[])
 .controller('formAnimationController', function () {

 })
 .directive('formAnimation',['$animate', function ($animate) {
  return {
  restrict:'EA',
  link: function (scope, element, attr) {
   element.find("input").on('focus', function () {
   element.find("input").addClass("inputActive");
   element.find("label").removeClass("labelStyle").addClass("labelActive")
   });
   element.find("input").on('blur', function () {
   element.find("input").removeClass("inputActive");
   element.find("label").removeClass("labelActive").addClass("labelStyle");
   })
  }
  }
 }])

</script>
</html>

[b]总结[/b] 上面的两种方式只是体现了一下实现的方式，具体的实现样式大家可以可以参照效果图，调节CSS样式。希望这篇文章的内容对大家学习Angularjs和JS能有所帮助，如果有问题可以留言交流，谢谢大家对编程素材网的支持。

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