js通过contentWindow控制iframe子页面元素点击事件,并把值传给父页面[通俗易懂]

<!-- 父页面中的上传按钮 -->
<img src="ui/images/myimg.png" class="link" onclick="upload()" />

<iframe src="upload.php"id="box_paint_container" ></iframe>



upload.php 文件中有一个表单



<form enctype="multipart/form-data" action="upload.php"id="forms" method="post" name="upform" style="position: relative; ">  
  <input name="upfile" type="file"id="file" onchange="document.getElementById('forms').submit();
  window.parent.document.getElementById('box_paint_container').style.display='none';;"> 
</form>  

下面是父页面中的一个函数
<script type="text/javascript">

function upload(){
var a = document.getElementById('box_paint_container').contentWindow.document.getElementById("file");
a.click();

}
</script>

//上传文件类型列表 
require_once 'config.php';
require_once '../system/config/database.inc.php';
//require_once '../system/funcs/global.fun.php';
require_once 'incl/main.inc';
dbconnect(); $settings=get_settings(0); $options=get_options(); $lang=get_language(); 
if(isset($_COOKIE['uid'])){
$uid=intval(_encrypt(_getcookie("uid"),'DECODE'));	
$shopid=$_COOKIE['shopid'];	
$query='SELECT * FROM '.$dbss['prfx']."_member WHERE uid=$uid";
$result=neutral_query($query);
if(neutral_num_rows($result)>0){
$ext_user=neutral_fetch_array($result);
$user=array();
$uname=$ext_user['username'];
$heading=$ext_user['headimg']==''?'/statics/uploads/'.$ext_user['img']:$ext_user['headimg'];
if($uname==''){
$uname=substr_replace($ext_user['mobile'],"****",5,2);
}
}
}
if(!isset($uid)){
//权限
redirect('/index.php/mobile/user/login.php');die();
}
$uptypes=array(  
'image/jpg',  
'image/jpeg',  
'image/png',  
'image/pjpeg',  
'image/gif',  
'image/x-png'  
);  
$max_file_size=2000000;     //上传文件大小限制, 单位BYTE  
$destination_folder="uploadimg/"; //上传文件路径  
$watermark=0;      //是否附加水印(1为加水印,其他为不加水印);  
$watertype=1;      //水印类型(1为文字,2为图片)  
$waterposition=1;     //水印位置(1为左下角,2为右下角,3为左上角,4为右上角,5为居中);  
$waterstring="http://www.xplore.cn/";  //水印字符串  
$waterimg="xplore.gif";    //水印图片  
$imgpreview=0;      //是否生成预览图(1为生成,其他为不生成);  
$imgpreviewsize=1/2;    //缩略图比例  
if ($_SERVER['REQUEST_METHOD'] == 'POST')  
{
if (!is_uploaded_file($_FILES["upfile"]['tmp_name']))  
//是否存在文件  
{  
echo "图片不存在!";  
exit;  
}  
$file = $_FILES["upfile"];  
if($max_file_size < $file["size"])  
//检查文件大小  
{  
echo "文件太大!";  
exit;  
}  
if(!in_array($file["type"], $uptypes))  
//检查文件类型  
{  
echo "文件类型不符!".$file["type"];  
exit;  
}  
if(!file_exists($destination_folder))  
{  
mkdir($destination_folder);  //上传到的位置
}  
$filename=$file["tmp_name"];  
$image_size = getimagesize($filename);  
$pinfo=pathinfo($file["name"]);  
$ftype=$pinfo['extension'];  
$destination = $destination_folder.time().".".$ftype;  
if (file_exists($destination) && $overwrite != true)  
{  
echo "同名文件已经存在了";  
exit;  
}  
if(!move_uploaded_file ($filename, $destination))  
{  
echo "移动文件出错";  
exit;  
}  
$pinfo=pathinfo($destination);  //文件名
$fname=$pinfo['basename']; 
$line='<img onclick="imgbig(this)"src="'.$destination_folder.$fname.'"  style="width:100px;" />';
$query='INSERT INTO '.$dbss['prfx']."_lines VALUES(NULL,$uid,'$uname',$timestamp,'$line','$shopid','$heading','',0)";
neutral_query($query);
//print_r($line);exit;
//echo " <font color=red>上传中....</font><br>";  
// echo " 宽度:".$image_size[0];  
// echo " 长度:".$image_size[1];  
// echo "<br> 大小:".$file["size"]." bytes";  
}