JS 仿支付宝input文本输入框放大组件的实例

2019-11-19 14:56:32

字体：大中小

来源：转载

供稿：网友

input输入的时候可以在后边显示数字放大镜

<!doctype html><html lang="en"> <head> <meta charset="UTF-8"> <title>JS 仿支付宝input文本输入框放大组件</title> <script src="js/jquery.min.js"></script> <style>  * { margin: 0; padding: 0; border-width: 1px; }  .parentCls {margin:5px 60px 0;}  .js-max-input {border: solid 1px #ffd2b2; position:relative;background: #fffae5;padding: 0 10px 0 10px;font-size:20px;color: #ff4400}  .inputElem4{ width: 300px; height: 36px; border: 1px solid #E0E0E0; padding-left: 10px; line-height: 36px; font-size: 14px; } </style> </head> <body> <div class="parentCls">  <input type="text" class="inputElem4" autocomplete = "off" maxlength="18"/> </div>  <script src="js/jq22.js"></script>  <script>   // 初始化   $(function(){   new TextMagnifier({    inputElem: '.inputElem4',    align: 'bottom',    splitType: [6,4,4,4]   });   });  </script> </body></html>

/** * JS 仿支付宝的文本输入框放大组件 */  function TextMagnifier(options) {  this.config = {    inputElem   :  '.inputElem',  // 输入框目标元素  parentCls   :  '.parentCls',  // 目标元素的父类  align    :  'right',   // 对齐方式有 ['top','bottom','left','right']四种 默认为top  splitType   :  [3,4,4],   // 拆分规则  delimiter   :  '-'    // 分隔符可自定义  };  this.cache = {   isFlag : false  };  this.init(options); } TextMagnifier.prototype = {    constructor: TextMagnifier,  init: function(options) {  this.config = $.extend(this.config,options || {});  var self = this,   _config = self.config,   _cache = self.cache;    self._bindEnv();      },  /*  * 在body后动态添加HTML内容  * @method _appendHTML  */  _appendHTML: function($this,value) {   var self = this,    _config = self.config,    _cache = self.cache;   var html = '',    $parent = $($this).closest(_config.parentCls);    if($('.js-max-input',$parent).length == 0) {    html += '<div class="js-max-input"></div>';    $($parent).append(html);    }    var value = self._formatStr(value);    $('.js-max-input',$parent).html(value);  },  /*  * 给目标元素定位  * @method _position  * @param target  */  _position: function(target){  var self = this,   _config = self.config;  var elemWidth = $(target).outerWidth(),   elemHeight = $(target).outerHeight(),   elemParent = $(target).closest(_config.parentCls),   containerHeight = $('.js-max-input',elemParent).outerHeight();     $(elemParent).css({"position":'relative'});    switch(true){      case _config.align == 'top':        $('.js-max-input',elemParent).css({'position':'absolute','top' :-elemHeight - containerHeight/2,'left':0});    break;      case _config.align == 'left':    $('.js-max-input',elemParent).css({'position':'absolute','top' :0,'left':0});    break;      case _config.align == 'bottom':    $('.js-max-input',elemParent).css({'position':'absolute','top' :elemHeight + 4 + 'px','left':0});    break;      case _config.align == 'right':    $('.js-max-input',elemParent).css({'position':'absolute','top' :0,'left':elemWidth + 2 + 'px'});    break;  }  },  /**  * 绑定事件  * @method _bindEnv  */  _bindEnv: function(){  var self = this,   _config = self.config,   _cache = self.cache;  // 实时监听输入框值的变化  $(_config.inputElem).each(function(index,item){   $(item).keyup(function(e){    var value = $.trim(e.target.value),     parent = $(this).closest(_config.parentCls);    if(value == '') {     self._hide(parent);    }else {     var html = $.trim($('.js-max-input',parent).html());     if(html != '') {      self._show(parent);     }    }    self._appendHTML($(this),value);    self._position($(this));   });   $(item).unbind('focusin');   $(item).bind('focusin',function(){    var parent = $(this).closest(_config.parentCls),     html = $.trim($('.js-max-input',parent).html());    if(html != '') {     self._show(parent);    }   });   $(item).unbind('focusout');   $(item).bind('focusout',function(){    var parent = $(this).closest(_config.parentCls);    self._hide(parent);   });  });  },  /**  * 格式化下  * @method _formatStr  */  _formatStr: function(str){  var self = this,   _config = self.config,   _cache = self.cache;  var count = 0,   output = [];  for(var i = 0, ilen = _config.splitType.length; i < ilen; i++){   var s = str.substr(count,_config.splitType[i]);   if(s.length > 0){    output.push(s);   }   count+= _config.splitType[i];  }  return output.join(_config.delimiter);  },  /*  * 显示 放大容器  * @method _show  */  _show: function(parent) {  var self = this,   _config = self.config,   _cache = self.cache;  if(!_cache.isFlag) {   $('.js-max-input',parent).show();   _cache.isFlag = true;  }  },  /*  * 隐藏 放大容器  * @method hide  * {public}  */  _hide: function(parent) {  var self = this,   _config = self.config,   _cache = self.cache;  if(_cache.isFlag) {   $('.js-max-input',parent).hide();   _cache.isFlag = false;  }  } };

效果图