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JQuery plug-in jcrop + Fileapi perfectly implements Image Upload + cropping + preview code sharing

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Author: User
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JQuery plug-in jcrop + Fileapi perfectly implements Image Upload + cropping + preview code sharing

This article mainly introduces the jQuery plug-in jcrop + Fileapi perfect Image Upload + cropping + preview code, which is very simple and practical, and has great results. If you need it, you can refer to it.

Crop images on the webpage without passing through the server.

This is implemented with a https://github.com/mailru/FileAPI framework. With jcrop.

Advanced browsers use canvas cropping, and ie6 7 8 uses flash excessively.

Core code:

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Var el = $ ('input'). get (0 );

 

Seajs. use (['gallery/jcrop/0.9.12/jcrop.css ', 'gallery/jcrop/0.9.12/jcrop. js'], function (){

 

FileAPI. event. on (el, 'change', function (evt ){

Var files = FileAPI. getFiles (evt); // Retrieve file list

 

FileAPI. filterFiles (files, function (file, info ){

If (! /^ Image/. test (file. type )){

Alert ('incorrect image format ');

Return false;

}

Else if (file. size> 20 * FileAPI. MB ){

Alert ('image must be smaller than 20m ');

Return false;

}

Else {

Return true;

}

 

}, Function (files, rejected ){

Console. log (files );

 

If (files. length ){

Var file = files [0];

Var img0 = FileAPI. Image (file );

Var img1 = FileAPI. Image (file );

Var ratio = 0;

FileAPI. getInfo (file, function (err, info) {// get image ratio

If (! Err ){

If (info. width> info. height ){

Ratio = info. width/500;

}

Else {

Ratio = info. height/500;

}

}

});

 

Img0.resize (500,500, 'max ') // place image and register jcrop

. Get (function (err, img ){

$ ('# Img2'). empty ();

$ ('# Img2'). append ($ (img ));

 

$ ('# Img2'). children (). Jcrop ({

AspectRatio: 1,

BgColor: 'rgba (0,0, 0, 0.4 )',

OnSelect: function (c ){

Img1.matrix. sx = c. x * ratio;

Img1.matrix. sy = c. y * ratio;

Img1.matrix. sw = c. w * ratio;

Img1.matrix. sh = c. h * ratio;

Img1.matrix. dwx = 500;

Img1.matrix. dh = 500;

 

Img1.get (function (err, img ){

// $ ('# Img3'). empty ();

// $ ('# Img3'). append ($ (img ));

('{Img3'{.html ($ (img ));

});

 

}

});

});

$ ('# Btn'). on ('click', function (){

FileAPI. upload ({

// Url: '/testUpFile/upfile ',

// Headers: {'content-type': 'multipart/form-data '},

Files: {images: img1 },

SS: function (evt ){/*...*/},

Complete: function (err, xhr ){/*...*/

// Alert (xhr. responseText );

Console. log (xhr );

}

});

});

}

});

});

});

Complete code:

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<! DOCTYPE html>

<Html>

<Head>

<Title> TODO supply a title </title>

<Meta charset = "UTF-8">

<Meta name = "viewport" content = "width = device-width">

<Script src = "./jquery. min. js"> </script>

<Script src = "./jcrop/jquery. Jcrop. min. js"> </script>

<Link href = "./jcrop/jquery.Jcrop.min.css" rel = "stylesheet">

</Head>

<Style>

 

. Upload-btn {

Width: 130px;

Height: 25px;

Overflow: hidden;

Position: relative;

Border: 3px solid # 06c;

Border-radius: 5px;

Background: # 0cf;

 

}

. Upload-btn: hover {

Background: # 09f;

}

. Upload-btn _ txt {

Z-index: 1;

Position: relative;

Color: # fff;

Font-size: 18px;

Font-family: "Helvetica Neue ";

Line-height: 24px;

Text-align: center;

Text-shadow: 0 1px 1px #000;

}

. Upload-btn input {

Top:-10px;

Right:-40px;

Z-index: 2;

Position: absolute;

Cursor: pointer;

Opacity: 0;

Filter: alpha (opacity = 0 );

Font-size: 50px;

}

 

</Style>

 

 

<Body>

<Div>

<! -- "Js-fileapi-wrapper" -- required class -->

<Div class = "js-fileapi-wrapper upload-btn" id = "choose">

 

<Input name = "files" type = "file" multiple/>

<Button id = "btn"> upload </button>

</Div>

<Div id = "images">

 

<P style = "margin-top: 40px;"> </p>

 

<Div id = "img2"> </div>

 

<Div id = "img3"> </div>

</Div>

 

</Div>

 

<Script> window. FileAPI = {staticPath: './fileapi/'}; </script>

<Script src = "./fileapi/FileAPI. min. js"> </script>

<Script>

 

Var el = $ ('input'). get (0 );

 

 

FileAPI. event. on (el, 'change', function (evt ){

Var files = FileAPI. getFiles (evt); // Retrieve file list

 

FileAPI. filterFiles (files, function (file, info ){

If (! /^ Image/. test (file. type )){

Alert ('incorrect image format ');

Return false;

}

Else if (file. size> 20 * FileAPI. MB ){

Alert ('image must be smaller than 20m ');

Return false;

}

Else {

Return true;

}

 

}, Function (files, rejected ){

 

 

If (files. length ){

Var file = files [0];

Var img0 = FileAPI. Image (file );

Var img1 = FileAPI. Image (file );

Var ratio = 0;

FileAPI. getInfo (file, function (err, info) {// get image ratio

If (! Err ){

If (info. width> info. height ){

Ratio = info. width/500;

}

Else {

Ratio = info. height/500;

}

}

});

 

Img0.resize (500,500, 'max ') // place image and register jcrop

. Get (function (err, img ){

$ ('# Img2'). empty ();

$ ('# Img2'). append ($ (img ));

 

$ ('# Img2'). children (). Jcrop ({

AspectRatio: 1,

BgColor: 'rgba (0,0, 0, 0.4 )',

OnSelect: function (c ){

Img1.matrix. sx = c. x * ratio;

Img1.matrix. sy = c. y * ratio;

Img1.matrix. sw = c. w * ratio;

Img1.matrix. sh = c. h * ratio;

Img1.matrix. dwx = 500;

Img1.matrix. dh = 500;

 

Img1.get (function (err, img ){

// $ ('# Img3'). empty ();

// $ ('# Img3'). append ($ (img ));

('{Img3'{.html ($ (img ));

});

 

}

});

});

$ ('# Btn'). on ('click', function (){

FileAPI. upload ({

Url: '/testUpFile/upfile ',

 

Files: {images: img1 },

SS: function (evt ){/*...*/},

Complete: function (err, xhr ){/*...*/

// Alert (xhr. responseText );

 

}

});

 

});

 

}

});

});

 

</Script>

</Body>

</Html>

The above is all the content of this article. I hope you will like it.

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