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How to implement message board function in JS

亚连Original: 2018-06-14 18:03:587191browse

I recently implemented the message board function based on js. The functions implemented include non-empty verification of the publisher and the published content, floor effect display and release time display. For specific example codes, please refer to this article

Function implementation:

1. Publisher and published content are not empty verification
2.Edit and delete function
3. Floor effect display
4. Release time display

Rendering

How to implement message board function in JS

Directory

How to implement message board function in JS

tools.js

Time toolkit

function getTime(){
  var weeks = ["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
  var date = new Date();
  var year = date.getFullYear();
  var month = date.getMonth()+1;
  var da = date.getDate();
  var hour = date.getHours()<10 ? "0"+date.getHours() : date.getHours() ;
  var minute = date.getMinutes()<10 ? "0"+date.getMinutes() : date.getMinutes() ;
  var second = date.getSeconds()<10 ? "0"+date.getSeconds() : date.getSeconds() ;
  var week = date.getDay();
  var time = year+"年"+month+"月"+da+"日 "+hour+":"+minute+":"+second +" "+weeks[week];
  return time;
}

Message board.html

<!DOCTYPE html>
<html>
  <head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <script type="text/javascript" src="tools.js"></script>
    <style>
      #box {
        width: 800px;
        margin: 0 auto;
      }
      textarea {
        width: 800px;
      }
      #li {
        display: block;
        border-bottom: 1px dashed #ebebeb;
        margin: 10px 0;
        padding: 8px 0;
      }
    </style>
  </head>
  <body>
    <p id="box">
      <h3>留言板 </h3>
      发布人：<input type="text" id="person" value="">
      共<input style="border: 0;" name="" id="louceng">
      <textarea name="" id="text" rows="10"></textarea>
      <input type="button" value="确认发布" id="btn" />
      <h3>全部留言</h3>
      <hr/>
    </p>
    <script>
      var num = 0;
      var num1 = 0;
      var box = document.getElementById("box");
      var text = document.getElementById("text");
      var btn = document.getElementById("btn");
      var person = document.getElementById("person");
      var ul = document.createElement("ul");
      ul.id = "ul1";
      var time = document.createElement("p");
      document.getElementById("louceng").value=num+"楼";
      btn.onclick = function() {
        //非空判断
        if(person.value==""||person.value==null){
          alert("发布人不允许为空！");
          return false;
        }
        if(text.value==""||text.value==null){
          alert("内容不允许为空！");
          return false;
        }
        //获取时间
        num = num+1;
        var datetime = getTime();
        time = document.createTextNode("发布时间：" + datetime);
        var li = document.createElement("li");
        li.id = "li";
        //创建删除功能
        var oA = document.createElement("a");
        var oAtext = document.createTextNode("删除");
        oA.href = "#";
        oA.appendChild(oAtext);
        //创建发布文本框
        var fabu = document.createElement("textarea");
        fabu.rows = "10";
        fabu.style = "margin: 0px; width: 760px; height: 138px;";
        fabu.value = text.value;
        fabu.disabled="disabled";
        //创建编辑功能
        var oB = document.createElement("a");
        var oBtext = document.createTextNode("编辑");
        oB.href = "#";
        oB.appendChild(oBtext);
        //创建确认按钮
        var butt = document.createElement("input");
        butt.type = "button";
        butt.value = "确认";
        butt.style.display = "none";
        //解决兼容问题
        var ali = ul.getElementsByTagName("li");
        if(ali.length == 0) {
          ul.appendChild(li);
        } else {
          ul.insertBefore(li, ali[0]);
        }
        //添加节点
        box.appendChild(ul);
        var lou = document.createTextNode("第"+num+"楼");
        var persons = document.createTextNode("发布人："+ person.value);
        document.getElementById("person").value="";
        var textnode = document.createTextNode("发布内容：");
        document.getElementById("text").value="";
        li.appendChild(lou);
        li.appendChild(document.createElement("br"));
        li.appendChild(persons);
        li.appendChild(document.createElement("br"));
        li.appendChild(textnode);
        li.appendChild(document.createElement("br"));
        li.appendChild(fabu);
        li.appendChild(time);
        li.appendChild(oA);
        li.appendChild(oB);
        li.appendChild(butt);
        //删除
        oA.onclick = function() {
          ul.removeChild(this.parentNode);
          //删除时更新
          num1++;//删除次数
          document.getElementById("louceng").value=num-num1+"楼";
        };
        //编辑
        oB.onclick = function() {
          fabu.disabled = "";
          butt.style.display = "block";
        }
        //确认更改
        butt.onclick = function() {
          fabu.disabled="disabled";
          butt.style.display = "none";
        }
        //楼层展示
        document.getElementById("louceng").value=num-num1+"楼";
      }
    </script>
  </body>
</html>

The above is what I compiled for everyone Yes, I hope it will be helpful to everyone in the future.

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