Mobile image upload Solution localresizeimg Ajax no-refresh upload after first compression

Last Update:2016-11-09 Source: Internet

Author: User

Tags base64 save file

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Now the technology is too developed, mobile devices more and more pixels, just a photo 2m+, but to do the mobile image upload and pc slightly different, mobile you can not limit the size of the image, so that users to process the image before uploading, so unrealistic. So understanding the solution is to upload the image before uploading , and then upload the compressed image to the server.

After Google, found localresizeimg, it will compress the image to your specified width and quality and conversion to Base64 image format, then we can put this base64 through Ajax to the backstage, and then save, The purpose of the first compression and upload is achieved.

Processing Process

Localresizeimg compressing pictures
Ajaxpost picture Base64 to backstage
Background receive Base64 and save, return status

Front Code

Focus, referencing Localresizeimg.js (plug-in body) and mobileBUGFix.mini.js (mobile-side patches)

<!DOCTYPE HTML><Html><Head><MetaCharSet= "UTF-8"><Title> Mobile Image Upload solution localresizeimg first compressed Ajax no-refresh upload</Title><MetaName= "description"Content=""/><MetaName= "Viewport"Content= "Width=device-width, initial-scale=1.0, user-scalable=0, minimum-scale=1.0, maximum-scale=1.0"/><ScriptType= ' Text/javascript 'Src= ' Js/jquery-2.0.3.min.js '></Script><ScriptType= ' Text/javascript 'Src= ' Js/localresizeimg.js '></Script><ScriptType= ' Text/javascript 'Src= ' Js/patch/mobilebugfix.mini.js '></Script><StyleType= "Text/css">Body{Font-family:"Microsoft Jas Black"}. uploadbtn{Display:Block;Height:40px;Line-height:40px;Color:#333;Text-align:Center;Width:100%;Background:#f2f2f2;Text-decoration:None;}. imglist{Min-height:200px;Margin:10px;}. imglist img{Width:100%;}</Style></Head><Body><DivStyle= "width:500px;margin:10px auto; Border:solid 1px #ddd; Overflow:hidden; "><InputType= "File"Id= "Uploadphoto"Name= "UploadFile"Value= "Please click Upload image"Style= "Display:none;"/><DivClass= "Imglist"></Div><AHref= "Javascript:void (0);"OnClick= "Uploadphoto.click ()"Class= "UPLOADBTN"> Click Upload File</A></Div><div style= "text-align:center;margin-top:50px;" >@ <a href= "http://www.devdo.net/" </a></div< Span style= "color: #0000ff;" >> </body>< Span style= "color: #0000ff;" ></html>

js section, LOCALRESIZEIMG and Ajax submission Section

How to use

$ (' Input:file '). Localresizeimg ({      width:400,//width      quality:1,//quality      success:function (result) {           Result.base64/result.clearbase64      }});

Localresizeimg Parameters:

Width: thumbnail width
Quality: Picture quality, 0-1, bigger better

Localresizeimg return value

Result.base64: Base64 encoding with image type, can be used directly in the IMG tag src, such as "data:image/jpeg;base64,/9j/4aaqskzjrgabaqaaaqabaad/... 2wBDAAYEBQYFBAY ";
RESULT.CLEARBASE64: Encoding without a picture type, such as "/9j/4aaqskzjrgabaqaaaqabaad/... 2wBDAAYEBQYFBAY "

$ (document). Ready (function (e) {$ (' #uploadphoto '). Localresizeimg ({width:400, quality:1, success:funct         Ion (Result) {var submitdata={base64_string:result.clearBase64,};           $.ajax ({type: "POST", url: "upload.php", Data:submitdata, DataType: "JSON",                Success:function (data) {if (0 = = data.status) {alert (data.content);             return false;                }else{alert (data.content); var attstr= '<img src= "' +data.url+ '" alt= " />'; $ (". Imglist "). Append (Attstr);}}, complete : function (XMLHttpRequest, textstatus) {}, Error:function (XMLHttpRequest, Textstatus, Errorthrown) {//Upload failed alert ( Xmlhttprequest.status); alert (xmlhttprequest.readystate); alert (textstatus); } }); } }); });

Save File

In the previous step, we put result.clearbase64 through Ajax into the upload.php, then we will receive the Base64 parameter in upload.php, convert it to an IMG file saved to the server, and give a hint.

 $base 64_string =$_post[' base64_string '];$savename =Uniqid (). '. JPEG ';//Localresizeimg compressed images are in JPEG format$savepath = ' images/'.$savename;$image = Base64_to_img ($base 64_string,$savepath);If$image){Echo ' {status ': 1, ' content ': ' Upload successful ', ' url ': '.$image. ' "} '; }Else{echo ' {"status": 0, "content": "Upload Failed"} '

the shortcomings

LOCALRESIZEIMG compressed image mode is JPEG, can not guarantee the original format.
When the width of the picture is less than localresizeimg settings, the picture will be lachen, resulting in distorted images (such as width height of 600, the image is only 400px, the compressed image becomes 600px, the image size becomes larger, will be distorted), I don't know if we have any good solutions.

DEMO Download

Mobile image upload Solution localresizeimg Ajax no-refresh upload after first compression

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