How to implement message board function in JS
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
Directory
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 id="留言板-nbsp">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 id="全部留言">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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