jQuery plug-in datalist implements a beautiful input drop-down list

jQuery plug-in datalist implements a beautiful input drop-down list_jquery

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Release： 2016-05-16 15:50:17

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HTML5 defines a nice-looking drop-down list in the input box - datalist. However, its current support is not good (Damn IE, fortunately you will gradually retire...). So I recently wrote a small datalist plug-in based on demand, which is compatible with IE8 (not many people use IE7 anymore, right?). The specific requirements for implementation are as follows:

When selected (triggering blur focus) (whether it is the mouse or the tab key), the input box is cleared and a custom drop-down list is displayed, and then the up and down keys of the keyboard can be used to select (there is no reason why the mouse cannot be used) , click the left mouse button or enter key to input the value of the selected list into the input box.

The specific implementation code is as follows:

HTML

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="description" content="" />
<meta name="keywords" content="" />
<meta name="robots" content="index, follow" />
<meta name="googlebot" content="index, follow" />
<meta name="author" content="codetker" />
  <title> 表单选中弹出框</title>
<link href="css/reset.css" type="text/css" rel="Stylesheet" /> 
<link href="css/master.css" type="text/css" rel="Stylesheet" /> 

<script type="text/javascript" src="js/jquery-1.11.0.js"></script>
</head>

<body>
  <div class="wrap">
    <form class="center">
      <div class="input_wrap">
        <input name="input1" class="input input1" type="text"/>
        <ul class="input1_ul select_list">
          <li>问题1</li>
          <li>问题2</li>
          <li>问题3</li>
          <li>问题4</li>
          <li>问题5</li>
        </ul>
      </div>
    </form>
  </div>
<script type="text/javascript" src="js/jquery.codetker.datalist.js"></script>
<script type="text/javascript">
$(document).ready(function(){
  $(".input_wrap").myDatalist({"bgcolor":"red","widths":1,"heights":1}); 
});
</script>
</body>
</html>

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CSS (reset.css is used to initialize browser default values, here is style.css)

.wrap{ margin:0 auto; font-family: "微软雅黑";font-size: 14px;}
.center{ margin: 0 auto; width:500px;}
.input{ margin: 0; padding: 0; /*border:none;*/ width:140px; height: 24px; float:left;}
.select_list{display: none; position:absolute; z-index: 100;}
.select_list li{ height:24px; margin: 0; padding: 0; background-color: #fff; cursor: pointer; list-style: none; position:relative;}
.select_list li:hover{ background-color: red;}
.input_wrap{ position:relative; }

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JavaScript

/*
  datalist 0.1 
  自定义datalist插件，实现html5中input元素datalist的效果
  兼容IE8+,Firefox,Chrome等常见浏览器
*/

;(function($,window,document,undefined){ //undefinde是真实的undefined，并非参数
  //将可选择的变量传递给方法

  //定义构造函数
  var Datalist=function(ele,opt){
    this.$element=ele;
    this.defaults={
      'bgcolor':'green',
      'widths':1,
      'heights':1
    },
    this.options=$.extend({}, this.defaults, opt);
  }
  //定义方法
  Datalist.prototype={
    showList:function(){
      var color=this.options.bgcolor;
      var width=this.options.widths;
      var height=this.options.heights; //属性值

      var obj=this.$element; //obj为最外层包裹的div之类的元素，应该拥有positive：relative属性,方便datalist定位。
      var input=$(obj).children().eq(0); //input元素
      var inputUl=$(obj).children().eq(1); //datalist元素
      //设置弹出datalist的大小和样式
      $(inputUl).css({
        "top":$(input).outerHeight()+"px",
        "width":$(input).outerWidth()*width+"px"
      });
      $(inputUl).children().css({
        "width":$(input).outerWidth()*width+"px",
        "height":$(input).outerHeight()*height+"px"
      });

      $(inputUl).children('li').mouseover(function() {
        $(this).css("background-color",color);
        $(this).siblings().css("background-color","#fff");
      });
      $(inputUl).children('li').mouseout(function() {
        $(this).css("background-color","#fff");
      });
      //再次focus变为空，也可以改为某个默认值
      //datalist的显示和隐藏
      $(input).focus(function() {
        if($(this).val()!=""){
          $(this).val("");
        }
        $(inputUl).slideDown(500);

        var n=-1; //记录位置,-1表示未选中。当n=-1时直接按enter浏览器默认为倒数第一个
        $(document).keydown(function(event) {
          /* 点击键盘上下键，datalist变化 */
          stopDefaultAndBubble(event);
          if(event.keyCode==38){//向上按钮
            if(n==0||n==-1){
              n=4;
            }else{
              n--;
            }
            $(inputUl).children('li').eq(n).siblings().mouseout();
            $(inputUl).children('li').eq(n).mouseover();
          }else if(event.keyCode==40){//向上按钮
            if(n==4){
              n=0;
            }else{
              n++;
            }
            $(inputUl).children('li').eq(n).siblings().mouseout();
            $(inputUl).children('li').eq(n).mouseover();
          }else if(event.keyCode==13){//enter键
            $(inputUl).children('li').eq(n).mouseout();
            $(input).val( $(inputUl).children('li').eq(n).text() );
            n=-1;
          }
        });


        //去掉浏览器默认
        function stopDefaultAndBubble(e){
          e=e||window.event;
          //阻止默认行为
          if (e.preventDefault) {
            e.preventDefault();
          }
          e.returnValue=false;

          //阻止冒泡
          if (e.stopPropagation) {
            e.stopPropagation();
          }
          e.cancelBubble=true;
        }

      });
      $(input).blur(function() {
        $(inputUl).slideUp(500);
      });
      $(inputUl).delegate('li', 'click', function() {
          $(input).val( $(this).text() );
      });

      return this;
    }
  }
  //在插件中使用Datalist对象
  $.fn.myDatalist=function(options){
    //创建实体
    var datalist=new Datalist(this,options);
    //调用其方法
    return datalist.showList();
  }
 
})(jQuery,window,document);

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Here, the ul li list is used to simulate datalist options. The implementation logic is very simple. What needs to be noted is that div.input_wrap is relatively positioned to facilitate the relative positioning of ul.input1_ul. Since there are many input boxes that do not affect each other, here is input1. Anyway, this is the first plug-in I developed myself, so I’ll mark it.

If you need the code, you can click https://github.com/codetker/myDatalist.

The above is the entire content of this article, I hope you all like it.