先上個效果圖：
Sample6_1.php 中創建Form：
復制代碼 代碼如下:
//顯示上傳狀態和圖片
<div id="showimg"></div>
//上傳文件需要定義enctype，為了顯示圖片將target設為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" />
//上傳文件
<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>
上傳圖片函數 uploadimg：
復制代碼 代碼如下:
function uploadimg(theform){
//提交Form
theform.submit();
//在showimg <div>中顯示上傳狀態
setStatus ("Loading...","showimg");
}
//上傳狀態函數
function setStatus (theStatus, theObj){
obj = document.getElementById(theObj);
if (obj){
obj.innerHTML = "<div class=\"bold\">" + theStatus + "</div>";
}
}
process_upload.php 提供文件上傳功能：
復制代碼 代碼如下:
<?php
//提供圖片類型校驗
$allowedtypes = array("image/jpeg","image/pjpeg","image/png", "image/x-png","image/gif");
//文件存放目錄
$savefolder = "images";
//如果有文件上傳就開始干活
if (isset ($_FILES['myfile'])){
//檢查上傳文件是否符合$allowedtypes類型
if (in_array($_FILES['myfile']['type'],$allowedtypes)){
if ($_FILES['myfile']['error'] == 0){
$thefile = "$savefolder/".$_FILES['myfile']['name'];
//通過move_uploaded_file上傳文件
if (!move_uploaded_file($_FILES['myfile']['tmp_name'], $thefile)){
echo "There was an error uploading the file.";
}
else{
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script type="text/javascript" src="functions.js"></script>
</head>
<body>
<!-- 顯示圖片 -->
<img src="<?php echo $thefile; ?>" onload="doneloading(parent,'<?php echo $thefile; ?>')" />
</body>
</html>
<?php
}
}
}
}
?>
上面代碼最後部分的doneloading 函數就是用來顯示圖片及修改圖片尺寸大小。其中會用到thumb.php，它會在images目錄中生成出源圖片的大、中、小三個尺寸，有興趣可以研究一下。歡迎大家拍磚～
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