这次给大家带来ajax与iframe框架实现图片文件上传(图文详解),ajax与iframe框架实现图片文件上传的注意事项有哪些,下面就是实战案例,一起来看一下。
大家应该可以举出几种常用的异步文件上传功能的实现方式,使用频率较多的有原生ajax和iframe框架,实现图片文件上传,下面就为大家分享图片文件上传的两种方式:原生ajax和iframe框架,供大家参考,具体内容如下
方法一:利用iframe框架上传图片
html代码如下:
<p class="frm">
<form name="uploadfrom" id="uploadfrom" action="upload.php" method="post" target="tarframe" enctype="multipart/form-data">
<input type="file" id="upload_file" name="upfile">
</form>
<iframe src="" width="0" height="0" style="display:none;" name="tarframe"></iframe>
</p>
<p id="msg">
</p>
index.js文件:
$(function(){
$(#upload_file).change(function(){
$(#uploadfrom).submit();
});
});
function stopsend(str){
var im=<img src='upload/images/"+str+"'>;
$(#msg).append(im);
}
upload.php文件:
<php
$file=$_files['upfile'];
$name=rand(0,500000).dechex(rand(0,10000)).".jpg";
move_uploaded_file($file['tmp_name'],"upload/images/".$name);
//调用iframe父窗口的js 函数
echo "<script>parent.stopsend('$name')</script>;
?>
方法二:原生态ajax文件上传
<!doctype html>
<html>
<head>
<title>html5 ajax 上传文件</title>
<meta charset="utf-8">
<script type="text/javascript">
var xhr;
function createxmlhttprequest()
{
if(window.activexobject)
{
xhr = new activexobject(microsoft.xmlhttp);
}
else if(window.xmlhttprequest)
{
xhr = new xmlhttprequest();
}
}
function upladfile()
{
var fileobj = document.getelementbyid(file).files[0];
var filecontroller = 'upload.php';
var form = new formdata();
form.append(myfile, fileobj);
createxmlhttprequest();
xhr.onreadystatechange = handlestatechange;
xhr.open(post, filecontroller, true);
xhr.send(form);
}
function handlestatechange()
{
if(xhr.readystate == 4)
{
if (xhr.status == 200 || xhr.status == 0)
{
var result = xhr.responsetext;
var json = eval(( + result + ));
alert('图片链接:n'+json.file);
}
}
}
</script>
<style>
.txt{ height:28px; border:1px solid #cdcdcd; width:670px;}
.mybtn{ background-color:#fff; line-height:14px;vertical-align:middle;border:1px solid #cdcdcd;height:30px; width:70px;}
.file{ position:absolute; top:0; right:80px; height:24px; filter:alpha(opacity:0);opacity: 0;width:260px }
</style>
</head>
<body>
<p class="form-group">
<label class="control-label">图片</label>
<br/>
<input type='text' name='textfield' id='textfield' class='txt' />
<span onclick="file.click()" class="mybtn">浏览...</span>
<input type="file" name="file" class="file" id="file" size="28" onchange="document.getelementbyid('textfield').value=this.value" />
<span onclick="upladfile()" class="mybtn">上传</span>
</p>
</body>
</html>
php代码:
<?php
if(isset($_files["myfile"]))
{
$ret = array();
$uploaddir = 'images'.directory_separator.date("ymd").directory_separator;
$dir = dirname(file).directory_separator.$uploaddir;
file_exists($dir) || (mkdir($dir,0777,true) && chmod($dir,0777));
if(!is_array($_files["myfile"]["name"])) //single file
{
$filename = time().uniqid().'.'.pathinfo($_files["myfile"]["name"])['extension'];
move_uploaded_file($_files["myfile"]["tmp_name"],$dir.$filename);
$ret['file'] = directory_separator.$uploaddir.$filename;
}
echo json_encode($ret);
}
?>
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以上就是ajax与iframe框架实现图片文件上传(图文详解)的详细内容。