在上一篇中讲解了如何通过ajax提交表单并由php处理底层数据，本篇将主要介绍图片的上传与处理。对于文件的上传很简单，只需一个form便可实现，再通过php将源文件上传到目标目录。先上个效果图：
Sample6_1.php 中创建Form：
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引用的内容：[www.bkjia.com]
//显示上传状态和图片 //上传文件需要定义enctype，为了显示图片将target设为uploadframe
enctype="multipart/form-data" target="uploadframe">
Upload a File:
//上传文件
上传图片函数 uploadimg：
Copy to Clipboard引用的内容：[www.bkjia.com]
function uploadimg(theform){ //提交Form
theform.submit();
//在showimg
中显示上传状态
setStatus ("Loading...","showimg");
}
//上传状态函数
function setStatus (theStatus, theObj){
obj = document.getElementById(theObj);
if (obj){
obj.innerHTML = "
}
}引用的内容：[www.bkjia.com]
//提供图片类型校验
$allowedtypes = array("image/jpeg","image/pjpeg","image/png", "image/x-png","image/gif");
//文件存放目录
$savefolder = "images";
//如果有文件上传就开始干活
if (isset ($_FILES['myfile'])){
//检查上传文件是否符合$allowedtypes类型
if (in_array($_FILES['myfile']['type'],$allowedtypes)){
if ($_FILES['myfile']['error'] == 0){
$thefile = "$savefolder/".$_FILES['myfile']['name'];
//通过move_uploaded_file上传文件
if (!move_uploaded_file($_FILES['myfile']['tmp_name'], $thefile)){
echo "There was an error uploading the file.";
}
else{
?>
br />"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
}
}
}
}
?>
setStatus ("Loading...","showimg");
}
//上传状态函数
function setStatus (theStatus, theObj){
obj = document.getElementById(theObj);
if (obj){
obj.innerHTML = "
" + theStatus + "
"; }
}
process_upload.php 提供文件上传功能：
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//提供图片类型校验 $allowedtypes = array("image/jpeg","image/pjpeg","image/png", "image/x-png","image/gif");
//文件存放目录
$savefolder = "images";
//如果有文件上传就开始干活
if (isset ($_FILES['myfile'])){
//检查上传文件是否符合$allowedtypes类型
if (in_array($_FILES['myfile']['type'],$allowedtypes)){
if ($_FILES['myfile']['error'] == 0){
$thefile = "$savefolder/".$_FILES['myfile']['name'];
//通过move_uploaded_file上传文件
if (!move_uploaded_file($_FILES['myfile']['tmp_name'], $thefile)){
echo "There was an error uploading the file.";
}
else{
?>
br />"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
}
}
}
}
?>
上面代码最后部分的doneloading 函数就是用来显示图片及修改图片尺寸大小。其中会用到thumb.php，它会在images目录中生成出源图片的大、中、小三个尺寸，有兴趣可以研究一下。欢迎大家拍砖～
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源码下载：Sample6.rar
转自：http://www.cnblogs.com/gnielee/
