Jquery ajax 怎样实现无刷新的文件上传

发布网友发布时间：2022-05-10 05:53

共2个回答

懂视网时间：2022-05-15 10:32

这次给大家带来ajax怎样实现不刷新的情况下上传文件，ajax实现不刷新上传文件的注意事项有哪些，下面就是实战案例，一起来看一下。

本文实例为大家分享了ajax实现无刷新上传文件功能的具体代码，供大家参考，具体内容如下

详细代码如下

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>ajax无刷新上传文件</title>
<script>
window.onload = function(){
 var oBtn = document.getElementById('btn');
 var oMyFile = document.getElementById('myFile');
 oBtn.onclick = function() {
 //alert(oMyFile.value); //获取到的是file控件的value值,这个内容是显示给你看的文字,不是我们选择的文件
 //oMyFile.files file控件中选择的文件列表对象
 //alert(oMyFile.files);
 //我们是要通过ajax把oMyFile.files[0]数据发送给后端
 /*
 for (var attr in oMyFile.files[0]) {
 console.log( attr + ' : ' + oMyFile.files[0][attr] );
 }
 */
 //利用ajax发送必须要有一个ajax对象
 var xhr = new XMLHttpRequest();
 //监听上传事件
 xhr.onload = function(){
 //alert(1);
 //alert(this.responseText);//后端返回的数据
 var d = JSON.parse(this.responseText);
 alert(d.msg + ' : ' + d.url); //显示上传成功 并且显示文件路径
 }
 xhr.open('post','post_file.php',true); //open打开的方式不能使用get,上传文件的地址,使用异步上传
 //在使用post发送的时候必须要带一些请求头信息
 xhr.setRequestHeader('X-Request-With', 'XMLHttpRequest');
 //send要发送数据 
 //将要上传的数据转换成二进制数据
 //那么必须知道后端接收当前文件的名称是什么 然后后面带上当前文件的数据
 var oFormData = new FormData(); //通过FormData来构建提交数据
 oFormData.append('file',oMyFile.files[0]);
 xhr.send(oFormData);
 }
}
</script>
</head>
<body>
 <input type="file" id="myFile" /><input type="button" id="btn" value="上传" />
</body>
</html>

后端php代码post_file.php

<?php
header('Content-type:text/html; charset="utf-8"');
$upload_dir = 'uploads/';
if(strtolower($_SERVER['REQUEST_METHOD']) != 'post'){
 exit_status(array('code'=>1,'msg'=>'错误提交方式'));
}
if(array_key_exists('file',$_FILES) && $_FILES['file']['error'] == 0 ){
 $pic = $_FILES['file'];
 if(move_uploaded_file($pic['tmp_name'], $upload_dir.$pic['name'])){
 exit_status(array('code'=>0,'msg'=>'上传成功','url'=>$upload_dir.$pic['name']));
 }
}
echo $_FILES['file']['error'];
exit_status(array('code'=>1,'msg'=>'出现了一些错误'));
function exit_status($str){
 echo json_encode($str);
 exit;
}
?>

相信看了本文案例你已经掌握了方法，更多精彩请关注Gxl网其它相关文章！

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热心网友时间：2022-05-15 07:40

using System.Data.OleDb;
using System.Data;

namespace _211
{
/// <summary>
/// DBQuery 的摘要说明。
/// </summary>
public sealed class DBQuery
{
static OleDbConnection conn=DBConnection.getConn();
static DataTable dt;

public static DataTable OpenQuery(string sql)
{
OleDbDataAdapter da=new OleDbDataAdapter(sql,conn);
dt=new DataTable();
try
{
da.Fill(dt);
}
catch(Exception ex)
{
throw ex;
}
finally
{
da.Dispose();
}

return dt;
}

public static DataTable OpenTable(string TableName)
{
OleDbDataAdapter da=new OleDbDataAdapter("select * from "+TableName,conn);
dt=new DataTable();
try
{
da.Fill(dt);
}
catch(Exception ex)
{
throw ex;
}
finally
{
da.Dispose();
}

return dt;
}

public static DataTable OpenTable(string TableName,int count)
{
OleDbDataAdapter da=new OleDbDataAdapter("select top "+count.ToString()+" * from "+TableName,conn);
dt=new DataTable();
try
{
da.Fill(dt);
}
catch(Exception ex)
{
throw ex;
}
finally
{
da.Dispose();
}

return dt;
}

public static DataTable OpenTable(string TableName,string IndexColumn,bool IsAsc)
{
OleDbDataAdapter da=new OleDbDataAdapter("select * from "+TableName+" order by "+IndexColumn+" "+(IsAsc?"Asc":"Desc"),conn);
dt=new DataTable();
try
{
da.Fill(dt);
}
catch(Exception ex)
{
throw ex;
}
finally
{
da.Dispose();
}

return dt;
}

public static DataTable OpenTable(string TableName,int count,string IndexColumn,bool IsAsc)
{
OleDbDataAdapter da=new OleDbDataAdapter("select top "+count.ToString()+" * from "+TableName+" order by "+IndexColumn+" "+(IsAsc?"Asc":"Desc"),conn);
dt=new DataTable();
try
{
da.Fill(dt);
}
catch(Exception ex)
{
throw ex;
}
finally
{
da.Dispose();
}

return dt;
}

public static DataTable OpenTable(string TableName,string[] column,bool IsCondition)
{
string tempsql="";
for(int i=0;i<column.Length;i++)
{
tempsql+=column[i];
if(i<column.Length-1)
{
if(IsCondition)
tempsql+=" and ";
else
tempsql+=",";
}
}

;
string sql="";
if(IsCondition)
sql="select * from "+TableName+" where "+tempsql;
else
sql="select "+tempsql+" from "+TableName;

OleDbDataAdapter da=new OleDbDataAdapter(sql,conn);
dt=new DataTable();
try
{
da.Fill(dt);
}
catch(Exception ex)
{
throw ex;
}
finally
{
da.Dispose();
}

return dt;
}

public static DataTable OpenTable(string TableName,string[] column,string[] condition)
{
string tempsql="";
string tempsql2="";

for(int i=0;i<column.Length;i++)
{
tempsql+=column[i];
if(i<column.Length-1)tempsql+=",";
}

for(int i=0;i<condition.Length;i++)
{
tempsql2+=condition[i];
if(i<condition.Length-1)tempsql2+=" and ";
}

OleDbDataAdapter da=new OleDbDataAdapter("select "+tempsql+" from "+TableName+" where "+tempsql2,conn);
dt=new DataTable();
try
{
da.Fill(dt);
}
catch(Exception ex)
{
throw ex;
}
finally
{
da.Dispose();
}

return dt;
}

public static DataTable OpenTable(string TableName,int count,string[] column)
{
string tempsql="";
for(int i=0;i<column.Length;i++)
{
tempsql+=column[i];
if(i<column.Length-1)tempsql+=",";
}

OleDbDataAdapter da=new OleDbDataAdapter("select top "+count.ToString()+" "+tempsql+" from "+TableName,conn);
dt=new DataTable();
try
{
da.Fill(dt);
}
catch(Exception ex)
{
throw ex;
}
finally
{
da.Dispose();
}

return dt;
}

public static DataTable OpenTable(string TableName,int count,string[] column,string[] condition)
{
string tempsql="";
string tempsql2="";

for(int i=0;i<column.Length;i++)
{
tempsql+=column[i];
if(i<column.Length-1)tempsql+=",";
}

for(int i=0;i<condition.Length;i++)
{
tempsql2+=condition[i];
if(i<condition.Length-1)tempsql2+=" and ";
}

OleDbDataAdapter da=new OleDbDataAdapter("select top "+count.ToString()+" "+tempsql+" from "+TableName+" where "+tempsql2,conn);
dt=new DataTable();
try
{
da.Fill(dt);
}
catch(Exception ex)
{
throw ex;
}
finally
{
da.Dispose();
}

return dt;
}

public static DataTable OpenTable(string TableName,int count,string[] column,string IndexColumn,bool IsAsc)
{
string tempsql="";
for(int i=0;i<column.Length;i++)
{
tempsql+=column[i];
if(i<column.Length-1)tempsql+=",";
}

OleDbDataAdapter da=new OleDbDataAdapter("select top "+count.ToString()+" "+tempsql+" from "+TableName+" order by "+IndexColumn+" "+(IsAsc?"Asc":"Desc"),conn);
dt=new DataTable();
try
{
da.Fill(dt);
}
catch(Exception ex)
{
throw ex;
}
finally
{
da.Dispose();
}

return dt;
}

public static DataTable OpenTable(string TableName,int count,string[] column,string[] condition,string IndexColumn,bool IsAsc)
{
string tempsql="";
string tempsql2="";

for(int i=0;i<column.Length;i++)
{
tempsql+=column[i];
if(i<column.Length-1)tempsql+=",";
}

for(int i=0;i<condition.Length;i++)
{
tempsql2+=condition[i];
if(i<condition.Length-1)tempsql2+=" and ";
}

OleDbDataAdapter da=new OleDbDataAdapter("select top "+count.ToString()+" "+tempsql+" from "+TableName+" where "+tempsql2+" order by "+IndexColumn+" "+(IsAsc?"Asc":"Desc"),conn);
dt=new DataTable();
try
{
da.Fill(dt);
}
catch(Exception ex)
{
throw ex;
}
finally
{
da.Dispose();
}

return dt;
}

public static DataTable OpenTable(string TableName,string[] column,string IndexColumn,bool IsAsc,int PageSize,int Page)
{
string tempsql="";
for(int i=0;i<column.Length;i++)
{
tempsql+=column[i];
if(i<column.Length-1)tempsql+=",";
}

string sql="";
if(Page==0)
sql="select top "+PageSize.ToString()+" "+tempsql+" from "+TableName+" order by "+IndexColumn+" "+(IsAsc?"Asc":"Desc");
else
sql="select top "+PageSize.ToString()+" "+tempsql+" from "+TableName+" where "+IndexColumn+(IsAsc?">":"<")+"(select "+(IsAsc?"max":"min")+"("+IndexColumn+") from "+TableName+" where "+IndexColumn+" in (select top "+(Page*PageSize)+" "+IndexColumn+" from "+TableName+" order by "+IndexColumn+" "+(IsAsc?"Asc":"Desc")+")) order by "+IndexColumn+" "+(IsAsc?"Asc":"Desc");

OleDbDataAdapter da=new OleDbDataAdapter(sql,conn);

dt=new DataTable();
try
{
da.Fill(dt);
}
catch(Exception ex)
{
throw ex;
}
finally
{
da.Dispose();
}

return dt;
}

public static DataTable OpenTable(string TableName,string[] column,string[] condition,string IndexColumn,bool IsAsc,int PageSize,int Page)
{
string tempsql="";
string tempsql2="";

for(int i=0;i<column.Length;i++)
{
tempsql+=column[i];
if(i<column.Length-1)tempsql+=",";
}

for(int i=0;i<condition.Length;i++)
{
tempsql2+=condition[i];
if(i<condition.Length-1)tempsql2+=" and ";
}