界面样式我是参考了一个国外的相册网站，改动不大，只是把鸟语转换成中文，以及上传时的样式也进行了改动，之所以选这个的原因就是，我很容易做扩展，它支持3种方式添加图片，一种拖拽上传，一种常规的选择文件上传，另外的就是添加网络图片。它很巧妙的把三种上传模式整合到了一起，而且你可以用IE浏览器浏览下，如果不支持HTML5，是没有拖拽上传图片的提示的，如图：
拖拽上传最重要的就是js部分的代码，它实现了70%的功能，另外30%仅仅是把图片信息提交到后台，然后做对应的处理，比如压缩啊，裁剪啊云云。所以先来看下js实现代码吧。
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<!DOCTYPE HTML> <html> <head> <meta charset="utf-8"> <title>无标题文档</title> <script src="js/jquery-1.7.1.min.js"></script> <style> .dashboard_target_box{width:250px;height:105px;border:3px dashed #E5E5E5;text-align:center;position:absolute;z-index:2000;top:0;left:0;cursor:pointer} .dashboard_target_box.over{border:3px dashed #000;background:#ffa} .dashboard_target_messages_container{display:inline-block;margin:12px 0 0;position:relative;text-align:center;height:44px;overflow:hidden;z-index:2000} .dashboard_target_box_message{position:relative;margin:4px auto;font:15px/18px helvetica,arial,sans-serif;font-size:15px;color:#999;font-weight:normal;width:150px;line-height:20px} .dashboard_target_box.over #dtb-msg1{color:#000;font-weight:bold} .dashboard_target_box.over #dtb-msg3{color:#ffa;border-color:#ffa} #dtb-msg2{color:orange} #dtb-msg3{display:block;border-top:1px #EEE dotted;padding:8px 24px} </style> <script> $().ready(function(){ if($.browser.safari || $.browser.mozilla){ $('#dtb-msg1 .compatible').show(); $('#dtb-msg1 .notcompatible').hide(); $('#drop_zone_home').hover(function(){ $(this).children('p').stop().animate({top:'0px'},200); },function(){ $(this).children('p').stop().animate({top:'-44px'},200); }); //功能实现 $(document).on({ dragleave:function(e){ e.preventDefault(); $('.dashboard_target_box').removeClass('over'); }, drop:function(e){ e.preventDefault(); //$('.dashboard_target_box').removeClass('over'); }, dragenter:function(e){ e.preventDefault(); $('.dashboard_target_box').addClass('over'); }, dragover:function(e){ e.preventDefault(); $('.dashboard_target_box').addClass('over'); } }); var box = document.getElementById('target_box'); box.addEventListener("drop",function(e){ e.preventDefault(); //获取文件列表 var fileList = e.dataTransfer.files; var img = document.createElement('img'); //检测是否是拖拽文件到页面的操作 if(fileList.length == 0){ $('.dashboard_target_box').removeClass('over'); return; } //检测文件是不是图片 if(fileList[0].type.indexOf('image') === -1){ $('.dashboard_target_box').removeClass('over'); return; } if($.browser.safari){ //Chrome8+ img.src = window.webkitURL.createObjectURL(fileList[0]); }else if($.browser.mozilla){ //FF4+ img.src = window.URL.createObjectURL(fileList[0]); }else{ //实例化file reader对象 var reader = new FileReader(); reader.onload = function(e){ img.src = this.result; $(document.body).appendChild(img); } reader.readAsDataURL(fileList[0]); } var xhr = new XMLHttpRequest(); xhr.open("post", "test.php", true); xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest"); xhr.upload.addEventListener("progress", function(e){ $("#dtb-msg3").hide(); $("#dtb-msg4 span").show(); $("#dtb-msg4").children('span').eq(1).css({width:'0px'}); $('.show').html(''); if(e.lengthComputable){ var loaded = Math.ceil((e.loaded / e.total) * 100); $("#dtb-msg4").children('span').eq(1).css({width:(loaded*2)+'px'}); } }, false); xhr.addEventListener("load", function(e){ $('.dashboard_target_box').removeClass('over'); $("#dtb-msg3").show(); $("#dtb-msg4 span").hide(); var result = jQuery.parseJSON(e.target.responseText); alert(result.filename); $('.show').append(result.img); }, false); var fd = new FormData(); fd.append('xfile', fileList[0]); xhr.send(fd); },false); }else{ $('#dtb-msg1 .compatible').hide(); $('#dtb-msg1 .notcompatible').show(); } }); </script> </head> <body> |
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test.php文件
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<?php $r = new stdClass(); header('content-type: application/json'); $maxsize = 10; //Mb if($_FILES['xfile']['size'] > ($maxsize * 1048576)){ $r->error = "图片大小">图片大小不超过 $maxsize MB"; } $folder = 'files/'; if(!is_dir($folder)){ mkdir($folder); } $folder .= $_POST['folder'] ? $_POST['folder'] . '/' : ''; if(!is_dir($folder)){ mkdir($folder); } if(preg_match('/image/i', $_FILES['xfile']['type'])){ $filename = $_POST['value'] ? $_POST['value'] : $folder . sha1(@microtime() . '-' . $_FILES['xfile']['name']) . '.jpg'; }else{ $tld = split(',', $_FILES['xfile']['name']); $tld = $tld[count($tld) - 1]; $filename = $_POST['value'] ? $_POST['value'] : $folder . sha1(@microtime() . '-' . $_FILES['xfile']['name']) . $tld; } $types = Array('image/png', 'image/gif', 'image/jpeg'); if(in_array($_FILES['xfile']['type'], $types)){ $source = file_get_contents($_FILES["xfile"]["tmp_name"]); imageresize($source, $filename, $_POST['width'], $_POST['height'], $_POST['crop'], $_POST['quality']); }else{ move_uploaded_file($_FILES["xfile"]["tmp_name"], $filename); } $path = str_replace('test.php', '', $_SERVER['SCRIPT_NAME']); $r->filename = $filename; $r->path = $path; $r->img = '<img src="' . $path . $filename . '" alt="image" />'; echo json_encode($r); function imageresize($source, $destination, $width = 0, $height = 0, $crop = false, $quality = 80) { $quality = $quality ? $quality : 80; $image = imagecreatefromstring($source); if ($image) { // Get dimensions $w = imagesx($image); $h = imagesy($image); if (($width && $w > $width) || ($height && $h > $height)) { $ratio = $w / $h; if (($ratio >= 1 || $height == 0) && $width && !$crop) { $new_height = $width / $ratio; $new_width = $width; } elseif ($crop && $ratio <= ($width / $height)) { $new_height = $width / $ratio; $new_width = $width; } else { $new_width = $height * $ratio; $new_height = $height; } } else { $new_width = $w; $new_height = $h; } $x_mid = $new_width * .5; //horizontal middle $y_mid = $new_height * .5; //vertical middle // Resample error_log('height: ' . $new_height . ' - width: ' . $new_width); $new = imagecreatetruecolor(round($new_width), round($new_height)); imagecopyresampled($new, $image, 0, 0, 0, 0, $new_width, $new_height, $w, $h); // Crop if ($crop) { $crop = imagecreatetruecolor($width ? $width : $new_width, $height ? $height : $new_height); imagecopyresampled($crop, $new, 0, 0, ($x_mid - ($width * .5)), 0, $width, $height, $width, $height); //($y_mid - ($height * .5)) } // Output // Enable interlancing [for progressive JPEG] imageinterlace($crop ? $crop : $new, true); $dext = strtolower(pathinfo($destination, PATHINFO_EXTENSION)); if ($dext == '') { $dext = $ext; $destination .= '.' . $ext; } switch ($dext) { case 'jpeg': case 'jpg': imagejpeg($crop ? $crop : $new, $destination, $quality); break; case 'png': $pngQuality = ($quality - 100) / 11.111111; $pngQuality = round(abs($pngQuality)); imagepng($crop ? $crop : $new, $destination, $pngQuality); break; case 'gif': imagegif($crop ? $crop : $new, $destination); break; } @imagedestroy($image); @imagedestroy($new); @imagedestroy($crop); } } ?> |
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时间： 2024-10-25 02:47:36