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jquery表单提示，输入时提示文字滑动向上

时间：2014-03-06 08:46 来源：互联网作者：源码搜藏收藏推荐

<!doctype html>
<html>
<head>
<meta charset="gb2312">
<title>jQuery人性化表单标签提示</title>
<script type="text/javascript" src="http://www.codefans.net/ajaxjs/jquery-1.9.1.min.js"></script>
<script type="text/javascript">
!function($){
  var defaults = {
    position: "top",
    animationTime: 500,
    easing: "ease-in-out",
    offset: 20,
    hidePlaceholderOnFocus: true
	};
  $.fn.animateLabel = function(settings, btn) {
    var position = btn.data("position")  || settings.position,
    posx = 0,
    posy = 0;
    $(this).css({
      "left": "auto",
      "right": "auto",
      "position": "absolute",
      "-webkit-transition": "all " + settings.animationTime + "ms " + settings.easing,
      "-moz-transition": "all " + settings.animationTime + "ms " + settings.easing,
      "-ms-transition": "all " + settings.animationTime + "ms " + settings.easing,
      "transition": "all " + settings.animationTime + "ms " + settings.easing
    });
    switch (position) {
      case 'top':
        posx = 0;
        posy = ($(this).height() + settings.offset) * -1;
        $(this).css({
          "top": "0",
          "opacity": "1",
          "-webkit-transform": "translate3d(" + posx + ", " + posy + "px, 0)",
          "-moz-transform": "translate3d(" + posx + ", " + posy + "px, 0)",
          "-ms-transform": "translate3d(" + posx + ", " + posy + "px, 0)",
          "transform": "translate3d(" + posx + ", " + posy + "px, 0)"
        });
      break;
      case 'bottom':
        posx = 0;
        posy = ($(this).height() + settings.offset);
        $(this).css({
          "bottom": "0",
          "opacity": "1",
          "-webkit-transform": "translate3d(" + posx + ", " + posy + "px, 0)",
          "-moz-transform": "translate3d(" + posx + ", " + posy + "px, 0)",
          "-ms-transform": "translate3d(" + posx + ", " + posy + "px, 0)",
          "transform": "translate3d(" + posx + ", " + posy + "px, 0)"
        });
      break;
      case 'left':
        posx = ($(this).width() + settings.offset) * -1;
        posy = 0;
        $(this).css({
          "left": 0,
          "top": 0,
          "opacity": "1",
          "-webkit-transform": "translate3d(" + posx + "px, " + posy + "px, 0)",
          "-moz-transform": "translate3d(" + posx + "px, " + posy + "px, 0)",
          "-ms-transform": "translate3d(" + posx + "px, " + posy + "px, 0)",
          "transform": "translate3d(" + posx + "px, " + posy + "px, 0)"
        });
      break;
      case 'right':
        posx = $(this).width() + settings.offset;
        posy = 0;
        $(this).css({
          "right": 0,
          "top": 0,
          "opacity": "1",
          "-webkit-transform": "translate3d(" + posx + "px, " + posy + "px, 0)",
          "-moz-transform": "translate3d(" + posx + "px, " + posy + "px, 0)",
          "-ms-transform": "translate3d(" + posx + "px, " + posy + "px, 0)",
          "transform": "translate3d(" + posx + "px, " + posy + "px, 0)"
        });
      break;
    }
  }
  $.fn.removeAnimate = function(settings, btn) {
    var position = btn.data("position")  || settings.position,
    posx = 0,
    posy = 0;
    $(this).css({
      "top": "0",
      "opacity": "0",
      "-webkit-transform": "translate3d(" + posx + ", " + posy + "px, 0)",
      "-moz-transform": "translate3d(" + posx + ", " + posy + "px, 0)",
      "-ms-transform": "translate3d(" + posx + ", " + posy + "px, 0)",
      "transform": "translate3d(" + posx + ", " + posy + "px, 0)"
    });
  }
  $.fn.label_better = function(options){
    var settings = $.extend({}, defaults, options),
        el = $(this),
        triggerIn = "focus",
        triggerOut = "blur";
    if(settings.easing == "bounce") settings.easing = "cubic-bezier(0.175, 0.885, 0.420, 1.310)"
    el.each(function( index, value ) {
      var btn = $(this),
          position = btn.data("position")  || settings.position;
      btn.wrapAll("<div class='lb_wrap' style='position:relative; display: inline;'></div>")
      if( btn.val().length > 0) {
        var text = btn.data("new-placeholder")  || btn.attr("placeholder");
        $("<div class='lb_label " + position + "'>"+ text + "</div>").css("opacity", "0").insertAfter(btn).animateLabel(settings, btn);
      }
      btn.bind(triggerIn, function() {
        if(btn.val().length < 1) {
          var text = btn.data("new-placeholder")  || btn.attr("placeholder"),
           position = btn.data("position")  || settings.position;
          $("<div class='lb_label " + position + "'>"+ text + "</div>").css("opacity", "0").insertAfter(btn).animateLabel(settings, btn);
        }
        if (settings.hidePlaceholderOnFocus == true) {
          btn.data("default-placeholder", btn.attr("placeholder"))
          btn.attr("placeholder", "")
        }
        btn.parent().find(".lb_label").addClass("active");
      }).bind(triggerOut, function() {
        if(btn.val().length < 1) {
          btn.parent().find(".lb_label").bind("transitionend webkitTransitionEnd oTransitionEnd MSTransitionEnd", function(){ $(this).remove(); }).removeAnimate(settings, btn)
        }
        if (settings.hidePlaceholderOnFocus == true) {
          btn.attr("placeholder", btn.data("default-placeholder"))
          btn.data("default-placeholder", "")
        }
        btn.parent().find(".lb_label").removeClass("active");
      });
    });
  }
}(window.jQuery);
</script>
<style>
html {
  height: 100%;
}
body {
  background: #272D30;
  padding: 0;
  text-align: center;
  font-family: 'open sans';
  position: relative;
  margin: 0;
  height: 100%;
}
.wrapper {
	height: auto !important;
	height: 100%;
	margin: 0 auto; 
	overflow: hidden;
}
a {
  text-decoration: none;
}
h1, h2 {
  width: 100%;
  float: left;
}
h1 {
  margin-top: 100px;
  color: #fff;
  text-shadow: 0 1px 5px rgba(0,0,0,0.5);
  margin-bottom: 5px;
  font-size: 70px;
  letter-spacing: -4px;
}
h2 {
  color: #5F7591;
  font-weight: bold;
  text-shadow: 0 1px 5px rgba(0,0,0,0.5);
  margin-top: 0;
  margin-bottom: 10px;
}
.pointer {
  color: #9b59b6;
  font-family: 'Pacifico', cursive;
  font-size: 30px;
  margin-top: 15px;
}
pre {
  margin: 80px auto;
}
pre code {
  padding: 35px;
  border-radius: 5px;
  font-size: 15px;
  background: rgba(0,0,0,0.1);
  border: rgba(0,0,0,0.05) 5px solid;
  max-width: 500px;
}
.main {
  float: left;
  width: 100%;
  margin: 0 auto;
}
.main h1 {
  padding:20px 50px;
  float: left;
  width: 100%;
  font-size: 60px;
  box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  font-weight: 100;
  margin: 0;
  padding-top: 25px;
  font-family: 'Pacifico';
  letter-spacing: 2px;
}
.main h1.demo1 {
  background: #1ABC9C;
}
.reload.bell {
  font-size: 12px;
  padding: 20px;
  width: 45px;
  text-align: center;
  height: 47px;
  border-radius: 50px;
  -webkit-border-radius: 50px;
  -moz-border-radius: 50px;
}
.reload.bell #notification {
  font-size: 25px;
  line-height: 140%;
}
.reload, .btn{
  display: inline-block;
  border: 4px solid #A2261E;
  border-radius: 5px;
  -moz-border-radius: 5px;
  -webkit-border-radius: 5px;
  background: #CC3126;
  display: inline-block;
  line-height: 100%;
  padding: 0.7em;
  text-decoration: none;
  color: #fff;
  width: 100px;
  line-height: 140%;
  font-size: 17px;
  font-family: open sans;
  font-weight: bold;
}
.reload:hover{
  background: #A2261E;
}
.btn {
  width: 200px;
  color: #fff;
  border: none;
  margin-left: 10px;
  background: rgba(255, 255, 255, 0.11);
}
.clear {
  width: auto;
}
.btn:hover, .btn:hover {
  background: rgba(255,255,255,0.3);
}
.btns {
  width: 410px;
  margin: 50px auto;
}
.credit {
  font-style: italic;
  text-align: center;
  color: #fff;
  padding: 10px;
  margin: 0 0 40px 0;
  float: left;
  width: 100%;
}
.credit a {
  color: #ccc;
  text-decoration: none;
  font-weight: bold;
}
.back {
  position: absolute;
  top: 0;
  left: 0;
  text-align: center;
  display: block;
  padding: 7px;
  width: 100%;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  background: rgba(0, 0, 0, 0.65);
  font-weight: bold;
  font-size: 13px;
  color: #fff;
  -webkit-transition: all 200ms ease-out;
  -moz-transition: all 200ms ease-out;
  -o-transition: all 200ms ease-out;
  transition: all 200ms ease-out;
}
.back:hover {
  background: rgba(0, 0, 0, 0.85);
}
.bl_form {
  margin: 150px 0;
}
.bl_form input {
  padding-top: 15px;
  background: rgba(255,255,255,0.10);
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  border: none;
  color: white;
  padding: 10px 15px;
  border-radius: 25px;
  font-size: 16px;
  outline: none;
}
.lb_wrap .lb_label.top, .lb_wrap .lb_label.bottom {
  left: 15px !important;
}
.lb_wrap .lb_label.left {
  left: 0;
}
.lb_label {
  font-weight: bold;
  color: #999;
}
.lb_label.active {
  color: #FFF;
}
</style>
<script>
 $(document).ready( function() {
   $(".label_better").label_better({
     easing: "bounce"
   });
 });
</script>
</head>
<body>
  <div class="wrapper">
	  <div class="main">
	    <div class="header">
        <h1>jQuery Label Better</h1>
        <h2>Label your form input like a boss</h2>
        <p class="credit">Created by Pete R., Founder of BucketListly</p>
        <div class="btns">
  	      
  	    </div>
  	  </div>
      <div class="page-container">
        <form class="bl_form">
          <input type="text"  class="label_better" data-new-placeholder="Username" placeholder="Username" >
          <input type="email"  class="label_better" data-new-placeholder="Email Address" placeholder="Email Address">
          <input type="password" value="abcdefg"  class="label_better" data-new-placeholder="Password" placeholder="Password">
          <input type="password" value="abcdefg" class="label_better" data-new-placeholder="Shhh.." placeholder="Confirm Password">
        </form>
      </div>
    </div>
    
  </div>
<div style="text-align:center;clear:both">
</div>
</body>
</html>

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