• \r\n \r\n  \r\n <\/p>\r\n  

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    Home Web Front-end JS Tutorial Example of JS imitating Alipay input text input box amplification component

    Example of JS imitating Alipay input text input box amplification component

    Jan 08, 2018 am 10:54 AM
    input javascript enlarge

    The following editor will bring you an example of a JS imitation Alipay input text input box amplification component. The editor thinks it’s pretty good, so I’ll share the js source code with you now and give it as a reference. If you are interested in js, please follow the editor to take a look.

    You can display a digital magnifying glass at the back when inputting


    <!doctype html>
    <html lang="en">
     <head>
     <meta charset="UTF-8">
     <title>JS 仿支付寶input文本輸入框放大組件</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>
     <p class="parentCls">
      <input type="text" class="inputElem4" autocomplete = "off" maxlength="18"/>
     </p>
      <script src="js/jq22.js"></script>
      <script>
       // 初始化
       $(function(){
       new TextMagnifier({
        inputElem: &#39;.inputElem4&#39;,
        align: &#39;bottom&#39;,
        splitType: [6,4,4,4]
       });
       });
      </script>
     </body>
    </html>



    /**
     * JS 仿支付寶的文本輸入框放大組件
     */ 
    
    
     function TextMagnifier(options) {
    
      this.config = {
      
      inputElem   :  &#39;.inputElem&#39;,  // 輸入框目標(biāo)元素
      parentCls   :  &#39;.parentCls&#39;,  // 目標(biāo)元素的父類
      align    :  &#39;right&#39;,   // 對(duì)齊方式有 [&#39;top&#39;,&#39;bottom&#39;,&#39;left&#39;,&#39;right&#39;]四種 默認(rèn)為top
      splitType   :  [3,4,4],   // 拆分規(guī)則
      delimiter   :  &#39;-&#39;    // 分隔符可自定義
      };
    
      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后動(dòng)態(tài)添加HTML內(nèi)容
      * @method _appendHTML
      */
      _appendHTML: function($this,value) {
       var self = this,
        _config = self.config,
        _cache = self.cache;
    
       var html = &#39;&#39;,
        $parent = $($this).closest(_config.parentCls);
    
        if($(&#39;.js-max-input&#39;,$parent).length == 0) {
        html += &#39;<p class="js-max-input"></p>&#39;;
        $($parent).append(html);
        }
        var value = self._formatStr(value);
        $(&#39;.js-max-input&#39;,$parent).html(value);
      },
      /*
      * 給目標(biāo)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 = $(&#39;.js-max-input&#39;,elemParent).outerHeight(); 
      
      $(elemParent).css({"position":&#39;relative&#39;});
      
      switch(true){
       
       case _config.align == &#39;top&#39;:
        
        $(&#39;.js-max-input&#39;,elemParent).css({&#39;position&#39;:&#39;absolute&#39;,&#39;top&#39; :-elemHeight - containerHeight/2,&#39;left&#39;:0});
        break;
       
       case _config.align == &#39;left&#39;:
    
        $(&#39;.js-max-input&#39;,elemParent).css({&#39;position&#39;:&#39;absolute&#39;,&#39;top&#39; :0,&#39;left&#39;:0});
        break;
       
       case _config.align == &#39;bottom&#39;:
    
        $(&#39;.js-max-input&#39;,elemParent).css({&#39;position&#39;:&#39;absolute&#39;,&#39;top&#39; :elemHeight + 4 + &#39;px&#39;,&#39;left&#39;:0});
        break;
       
       case _config.align == &#39;right&#39;:
    
        $(&#39;.js-max-input&#39;,elemParent).css({&#39;position&#39;:&#39;absolute&#39;,&#39;top&#39; :0,&#39;left&#39;:elemWidth + 2 + &#39;px&#39;});
        break;
      }
      },
      /**
      * 綁定事件
      * @method _bindEnv
      */
      _bindEnv: function(){
      var self = this,
       _config = self.config,
       _cache = self.cache;
    
      // 實(shí)時(shí)監(jiān)聽輸入框值的變化
      $(_config.inputElem).each(function(index,item){
    
       $(item).keyup(function(e){
        var value = $.trim(e.target.value),
         parent = $(this).closest(_config.parentCls);
        if(value == &#39;&#39;) {
         self._hide(parent);
        }else {
    
         var html = $.trim($(&#39;.js-max-input&#39;,parent).html());
    
         if(html != &#39;&#39;) {
          self._show(parent);
         }
        }
        self._appendHTML($(this),value);
        self._position($(this));
       });
    
       $(item).unbind(&#39;focusin&#39;);
       $(item).bind(&#39;focusin&#39;,function(){
        var parent = $(this).closest(_config.parentCls),
         html = $.trim($(&#39;.js-max-input&#39;,parent).html());
    
        if(html != &#39;&#39;) {
         self._show(parent);
        }
       });
    
       $(item).unbind(&#39;focusout&#39;);
       $(item).bind(&#39;focusout&#39;,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);
      },
      /*
      * 顯示 放大容器
      * @method _show
      */
      _show: function(parent) {
      var self = this,
       _config = self.config,
       _cache = self.cache;
      if(!_cache.isFlag) {
       $(&#39;.js-max-input&#39;,parent).show();
       _cache.isFlag = true;
      }
      },
      /*
      * 隱藏 放大容器
      * @method hide
      * {public}
      */
      _hide: function(parent) {
      var self = this,
       _config = self.config,
       _cache = self.cache;
      if(_cache.isFlag) {
       $(&#39;.js-max-input&#39;,parent).hide();
       _cache.isFlag = false;
      }
      }
     };


    Rendering

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