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Re size captures image from Web before Uploading.


1) Add a input file tag in your html page.

<input type="button" value="Capture" onclick="document.getElementById('image').click(); return false;" />

<input type="file" accept="image/*" capture="camera" id="image" style="visibility: hidden;">

2) Add below jquery script:

var image= document.getElementById('image');

image.onchange = function() {
  var file = image.files[0];
  var img = document.createElement("img");
  var reader = new FileReader();
  reader.onload = function(e) {
        img.src = e.target.result;
        img.onload = function () {
           var canvas = document.createElement("canvas");
           var ctx = canvas.getContext("2d");
           ctx.drawImage(img, 0, 0);
           var MAX_WIDTH = 400;
           var MAX_HEIGHT = 300;
           var width = this.width;
           var height = this.height;
           if (width > height) {
              if (width > MAX_WIDTH) {
                 height *= MAX_WIDTH / width;
                 width = MAX_WIDTH;
              }
           } else {
              if (height > MAX_HEIGHT) {
                 width *= MAX_HEIGHT / height;
                 height = MAX_HEIGHT;
              }
           }
           canvas.width = width;
           canvas.height = height;
           var ctx = canvas.getContext("2d");
           ctx.drawImage(img, 0, 0, width, height);
           var dataurl = canvas.toDataURL("image/png");
           upload(dataurl);
        };
        image.onerror= function() {
           alert('Invalid file type: '+ file.type);
        };
     }
     reader.readAsDataURL(file);

};

/* function to upload the image to server */

function upload(file) {
     var form = new FormData();
     form.append('image', file);     
     $.ajax({
 url: 'server.php',
 data: form,
 processData: false,
 contentType: false,
 type: 'POST',
 success: function(data){
   alert(data);
 }
     });
}


3) in the server side : (server.php)

$filename = "image_".uniqid().".png";
$dest = __DIR__.$filename;

$imgData = str_replace(' ','+',$_POST['image']);
$imgData =  substr($imgData,strpos($imgData,",")+1);
$imgData = base64_decode($imgData);

$file = fopen($dest, 'w');
fwrite($file, $imgData);
fclose($file);

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