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jquery implements the effect of prompting text to slide upward when entering a form_jquery

WBOY
WBOYOriginal
2016-05-16 15:46:101154browse

The example in this article describes how jquery implements the effect of prompting text to slide upward when entering a form. Share it with everyone for your reference. The details are as follows:

Here is a form input box prompt effect implemented based on jQuery. When no input is made, the prompt text is displayed in the input box. When the mouse clicks on the text box to enter text, the prompt text slides out of the input box, which seems very strange. The personality is also very smart, the user experience is relatively good, and some attributes of CSS3 are used. Therefore, when testing, please try to use higher versions of IE9 or web browsers such as Chrome and Firefox.

The screenshot of the running effect is as follows:

The specific code is as follows: 

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>jQuery人性化表单标签提示</title>
<script type="text/javascript" src="jquery-1.6.2.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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"></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>

I hope this article will be helpful to everyone’s jquery programming design.

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