Ajax+PHP边学边练 之五 图片处理

2018-09-07 17:29

阅读:186

  先上个效果图:


Sample6_1.php 中创建Form:
复制代码 代码如下:
//显示上传状态和图片
<div id=showimg></div>
//上传文件需要定义enctype,为了显示图片将target设为uploadframe
<form id=uploadform action=process_upload.php method=post
enctype=multipart/form-data target=uploadframe>
Upload a File:<br />
<input type=file id=myfile name=myfile />
//上传文件
<input type=submit value=Submit onclick=uploadimg(document.getElementById(uploadform)); return false; />
<iframe id=uploadframe name=uploadframe src=process_upload.php class=noshow></iframe>
</form>

上传图片函数 uploadimg:
复制代码 代码如下:
function uploadimg(theform){
//提交Form
theform.submit();
//在showimg <div>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){
}
}

process_upload.php 提供文件上传功能:
复制代码 代码如下:
<?php
//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{
?>
<!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN

<html xmlns=
<head>
<script type=text/javascript src=functions.js></script>
</head>
<body>
<!-- 显示图片 -->
<img src=<?php echo $thefile; ?> onload=doneloading(parent,<?php echo $thefile; ?>) />
</body>
</html>
<?php
}
}
}
}
?>

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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