XFE_星城前端_Peter
2015-06-28 15:39
<!DOCTYPE html> <html> <head> <meta charset=utf-8 /> <title>学生花名册</title> <script type="text/javascript"> //初始化数据 var db; var arraykey=[]; var openRequest; var lastCursor; var indexedDB = window.indexedDB || window.webkitIndexedDB || window.mozIndexedDB || window.msIndexedDB; var dbName = "student"; var dbVersion = 2.0; var tablename = "student" //页面加载完成之后执行数据库打开或者初始化 window.onload = function init(){ openRequest = indexedDB.open(dbName); //如果数据库存在就打开,如果数据库不存在就去新建 //1、创建新数据库,或者数据库版本号被更改的时候出发onupgradeneeded事件,并执行回调函数 openRequest.onupgradeneeded = function(e){ console.log("onupgradeneeded 运行中……"); var thisDb = e.target.result; console.log(thisDb.version); //判断是否有这个表格的存在 if(!thisDb.objectStoreNames.contains(tablename)){ console.log("我需要新建一个存储对象"); //如果表格不存在,创建一个新的表格(keyPath,主键 ; autoIncrement,是否自增),会返回一个对象(objectStore) var objectStore = thisDb.createObjectStore(tablename,{keyPath:"id",autoIncrement:true}); //指定可以被索引的字段,unique字段是否唯一 objectStore.createIndex("name","name",{unique:false}); objectStore.createIndex("address","address",{unique:false}); } } //2、打开数据库成功是触发的事件,onsuccess; openRequest.onsuccess = function(e){ db = e.target.result; console.log(db.version); db.onerror = function(event){ alert("数据库错误:"+event.taeget.errorCode); console.dir(event.target); }; //判断表格是否存在,存在则遍历数据 if(db.objectStoreNames.contains(tablename)){ console.log("contains table" +tablename); //通过事物去操控表格 var transaction = db.transaction([tablename],"readwrite"); //事物的回调函数处理 transaction.oncomplete = function(event){ console.log("全部完成!"); }; transaction.onerror = function(event){ console.dir(event); }; //得到表里面的objectStore对象 var objectStore = transaction.objectStore(tablename); //使用游标遍历 objectStore.openCursor().onsuccess =function(event){ var cursor = event.target.result; if(cursor){ console.log(cursor.key); console.log(cursor.value); render({key:cursor.key,name:cursor.value["name"],date:cursor.value["date"],address:cursor.value["address"]}) lastCursor = cursor.key; cursor.continue(); }else{ console.log("Done with cursor"); } }; objectStore.openCursor().onerror=function(event){ console.dir(event); } } } openRequest.onerror = function (event) { console.dir(event.target); } //添加方法 document.querySelector("#add").addEventListener("click",function(){ //初始化一个学生对象 var name = document.querySelector("#name").value; var date = document.querySelector("#date").value; var address = document.querySelector("#address").value; var student={"name":name,"date":date,"address":address}; //获取一个事物 var transaction = db.transaction([tablename],"readwrite"); //事物回调函数的处理 transaction.oncomplete = function(event){ console.log("transactiono complete"); } transaction.onerror = function(event){ console.dir(event); } //通过事物得到一个objectStore对象 var objectStore = transaction.objectStore(tablename); objectStore.add(student); //将新添加的数据,加入到html里面展示 objectStore.openCursor().onsuccess = function(){ cursor = event.target.result; var key; if(lastCursor==null){ key=cursor.key; lastCursor=key; }else{ key=++lastCursor; } render({key:key,name:name,date:date,address:address}); console.log("成功添加一条新纪录!key值:"+key); console.dir(student); } }); //查询数据库 document.querySelector("#seacher").addEventListener("click",function(){ var curName = document.getElementById("seartxt").value; var transaction =db.transaction([tablename],"readwrite"); transaction.oncomplete = function(event){ console.log("transaction complete"); }; transaction.onerror = function(event){ console.dir(event); }; //得到objectStore对象 var objectStore = transaction.objectStore(tablename); var boundKeyRange = IDBKeyRange.only(curName); //生成一个鞭尸范围的Range对象 objectStore.index("name").openCursor(boundKeyRange).onsuccess = function(event){ var cursor = event.target.result; if(!cursor){ return; } var rowData = cursor.value; console.log(rowData); document.getElementById("result").innerHTML="<caption><h3>学生花名册</h3></caption><tr><th>学号</th><th>姓名</th><th>生日</th><th>地址</th><th>删除</th></tr>" render({key:cursor.key,name:cursor.value["name"],date:cursor.value["date"],address:cursor.value["address"]}); cursor.continue(); } }); //删除数据库 document.querySelector("#deleteDatabase").addEventListener("click",function(){ if(confirm("您确定要删除数据库吗?\n操作不可逆")){ var dbname=prompt("请输入数据库名称,以确认删除",""); if(dbname==dbName){ var deleteDB=indexedDB.deleteDatabase(dbName); var result = document.querySelector("#result"); while(result.firstChild.nextSibling){ result.removeChild(result.firstChild.nextSibling); } window.location.reload(true); } } }); } //删除方法 function deletestu(key){ var transaction = db.transaction([tablename],"readwrite"); transaction.oncomplete = function(event){ console.log("transaction complete!"); }; transaction.onerror = function(event){ console.dir(event); } //得到objectStore对象 var objectStore = transaction.objectStore(tablename); //接收传过来的key值 var removeKey = parseInt(key); //通过key值获取对象,在控制台打印 var getRequest=objectStore.get(removeKey); getRequest.onsuccess=function(e){ var result = getRequest.result; console.dir(result); }; var request = objectStore.delete(removeKey); request.onsuccess = function(e){ console.log("success delete record!"); }; request.onerror = function(e){ console.log("Error delete record:",e); } document.getElementById(removeKey).style.display="none"; } //将从游标得到的database数据添加到html的方法 function render(student){ //接收传输的值 var stu=student; //将结束到的josn数据变成一行表格 var html ="<tr id='"+stu.key+"'><td>"+stu.key+"</td><td>"+stu.name+"</td><td>"+stu.date+"</td><td>"+stu.address+"</td><td><input type='button' onClick='deletestu("+stu.key+")' value='删除' />"; //将得到的表格数据,追加到结果表中去 document.getElementById("result").innerHTML +=html; } </script> <style type="text/css"> *{margin:0;padding:0;} #tools{ color:#fff; position:fixed; width:100%; bottom:0px; left:0px; background-color:#069; height:30px; line-height:30px; } #tools:hover{ height:150px;} #tools div{ width:30%; float:left; text-align:center; } #tools div { display:block; } #tools div input[type=button],input[type=reset]{ width:70px; background-color:#fff; color:#069; border:0; font-weight:bolder; margin-left:5px; } table{ border:2px solid #ccc; margin:20px auto; } td,th{ width:200px; border:1px solid #069; } </style> </head> <body> <table id="result" cellpadding="0" cellspacing="0"> <caption><h3>学生花名册</h3></caption> <tr><th>学号</th><th>姓名</th><th>生日</th><th>地址</th><th>删除</th></tr> </table> <div id="tools"> <div id="adddiv"> <h3>添加学生</h3> <label for="name">姓名</label><input type="text" name="name" id="name" /><br /> <label for="date">生日</label><input type="date" name="date" id="date" /><br /> <label for="address">地址</label><input type="text" name="address" id="address" /><br /> <input type="button" name="add" value="添加" id="add"/><input type="reset" value="重置表单" /> </div> <div id="seacherdiv"> <h3>搜索学生姓名</h3> <input type="text" id="seartxt" /><input type="button" id="seacher" name="seacher" value="搜索"/> </div> <div id="deletediv"> <h3>删除数据库</h3> <input type="button" name="deleteDatabase" id="deleteDatabase" value="删除数据库" /> </div> </div> </body> </html>
添加了一些自己的小逻辑,纯js代码,用高版本谷歌浏览器打开即可正常运行
超给力,谢谢
老师都不说一下render函数,对于我们这种有第一次接触indexedDB的人来说,我还以为render是api里面的函数呢
代码不错,可以运行,谢谢这位作者
render 到底啥?
太棒了!
真心给你点赞!活雷锋!
我的测试完全正常的啦,等回头有空的时候我再看看代码咯!
我的代码也是,用你的代码也测试了,都是这个问题
//将新添加的数据,加入到html里面展示 //通过事物得到一个objectStore对象 var objectStore = transaction.objectStore(tablename); objectStore.add(student); objectStore.openCursor().onsuccess = function(){ cursor = event.target.result; var key; if(lastCursor==null){ key=cursor.key; lastCursor=key; }else{ key=++lastCursor; } render({key:key,name:name,date:date,address:address}); console.log("成功添加一条新纪录!key值:"+key); console.dir(student); }
objectStore.openCursor().onsuccess = function(){}这里会显示事务已经完成,导致render方法不能执行!
貌似报了一些错误。
要源码的可以过来拿,请叫我小雷锋,老师是大雷锋,大大的美女雷锋
HTML5存储
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