I am passing a base64 url through jquery ajax and want to save onto the server. But the code below is giving me a empty file. I have tried writing the decoded string and createimage from string but with both variables, 0 bites have been written. When i test the value being worked on it outputs [object FileReader]......i think either i am missing a step or making a mistake some where.
Also is there a way to convert the image to a $_FILE type object? reason being id like to using a wordpress function to save the file if possible.
Php code:
function uploadimg() {
$error = false;
//if ( ! function_exists( 'wp_handle_upload' ) ) require_once( ABSPATH . 'wp-admin/includes/file.php' );
//$upload_overrides = array( 'test_form' => false );
$images=array();
$a=0;
unset ($_POST['action']);
foreach($_POST as $basefile){
$upload_dir = wp_upload_dir();
$upload_path = str_replace( '/', DIRECTORY_SEPARATOR, $upload_dir['path'] ) . DIRECTORY_SEPARATOR;
$base64_string = $basefile;
echo $basefile;
$base64_string = preg_replace( '/data:image\/.*;base64,/', '', $base64_string );
$decoded_string= base64_decode($base64_string); // 0 bytes written in fwrite
$source = imagecreatefromstring($decoded_string); // 0 bytes written in fwrite
$output_file = $upload_path.'myfilef'.$a.'.jpg';
$images[]=$output_file;
$a++;
$image = fopen( $output_file, 'wb' );
$bytes=fwrite( $image, $source);
echo $bytes;
fclose( $image );
}
echo json_encode($images);
exit;
}
add_action('wp_ajax_uploadimg', 'uploadimg');
add_action('wp_ajax_nopriv_uploadimg', 'uploadimg');
jQuery sample code
jQuery(document).on('change', '.imageup', function(event){
errors= [];
errnum=0;
numberofimages=jQuery("#selectedimages > div").length; //get number of images
if(numberofimages<10){
var id= jQuery(this).attr('id');
var length= this.files.length;
if(length>1) {// if a multiple file upload
var images = new FormData();
images.append('action', 'uploadimg'); //wordpress specific
jQuery.each(event.target.files, function(key, value ){
var size= value.size;
var extension= value.name.substring(value.name.lastIndexOf('.') + 1).toLowerCase();
var allowedExtensions = ['png', 'jpg', 'jpeg', 'gif'];
if( allowedExtensions.indexOf(extension) !== -1 ) {
if(numberofimages<10){
var file=value;
console.log(file);
var fileReader = new FileReader();
fileReader.onload = function (e) {
var img = new Image();
img.onload = function () {
var MAX_WIDTH = 100;
var MAX_HEIGHT = 100;
var width = img.width;
var height = img.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;
}
}
var canvas = document.createElement("canvas");
canvas.width = width;
canvas.height = height;
canvas.getContext("2d").drawImage(this, 0, 0, width, height);
this.src = canvas.toDataURL('image/png');
} // end on load function
img.src = e.target.result;
} //end filereader function
fileReader.readAsDataURL(file);
console.log(fileReader);
images.append(key, fileReader);
numberofimages++;
} else {
errnum++;
errors[errnum]= value=' is a illegal file type';
}
}
});
//image holder finished, remove
jQuery('#'+id).remove();
jQuery.ajax({
url: '/wp-admin/admin-ajax.php',
type: 'POST',
data: images,
cache: false,
processData: false,
contentType: false,
success: function(data) {
console.log(data);
}//end of success function
});
I am passing a base64 url through jquery ajax and want to save onto the server. But the code below is giving me a empty file. I have tried writing the decoded string and createimage from string but with both variables, 0 bites have been written. When i test the value being worked on it outputs [object FileReader]......i think either i am missing a step or making a mistake some where.
Also is there a way to convert the image to a $_FILE type object? reason being id like to using a wordpress function to save the file if possible.
Php code:
function uploadimg() {
$error = false;
//if ( ! function_exists( 'wp_handle_upload' ) ) require_once( ABSPATH . 'wp-admin/includes/file.php' );
//$upload_overrides = array( 'test_form' => false );
$images=array();
$a=0;
unset ($_POST['action']);
foreach($_POST as $basefile){
$upload_dir = wp_upload_dir();
$upload_path = str_replace( '/', DIRECTORY_SEPARATOR, $upload_dir['path'] ) . DIRECTORY_SEPARATOR;
$base64_string = $basefile;
echo $basefile;
$base64_string = preg_replace( '/data:image\/.*;base64,/', '', $base64_string );
$decoded_string= base64_decode($base64_string); // 0 bytes written in fwrite
$source = imagecreatefromstring($decoded_string); // 0 bytes written in fwrite
$output_file = $upload_path.'myfilef'.$a.'.jpg';
$images[]=$output_file;
$a++;
$image = fopen( $output_file, 'wb' );
$bytes=fwrite( $image, $source);
echo $bytes;
fclose( $image );
}
echo json_encode($images);
exit;
}
add_action('wp_ajax_uploadimg', 'uploadimg');
add_action('wp_ajax_nopriv_uploadimg', 'uploadimg');
jQuery sample code
jQuery(document).on('change', '.imageup', function(event){
errors= [];
errnum=0;
numberofimages=jQuery("#selectedimages > div").length; //get number of images
if(numberofimages<10){
var id= jQuery(this).attr('id');
var length= this.files.length;
if(length>1) {// if a multiple file upload
var images = new FormData();
images.append('action', 'uploadimg'); //wordpress specific
jQuery.each(event.target.files, function(key, value ){
var size= value.size;
var extension= value.name.substring(value.name.lastIndexOf('.') + 1).toLowerCase();
var allowedExtensions = ['png', 'jpg', 'jpeg', 'gif'];
if( allowedExtensions.indexOf(extension) !== -1 ) {
if(numberofimages<10){
var file=value;
console.log(file);
var fileReader = new FileReader();
fileReader.onload = function (e) {
var img = new Image();
img.onload = function () {
var MAX_WIDTH = 100;
var MAX_HEIGHT = 100;
var width = img.width;
var height = img.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;
}
}
var canvas = document.createElement("canvas");
canvas.width = width;
canvas.height = height;
canvas.getContext("2d").drawImage(this, 0, 0, width, height);
this.src = canvas.toDataURL('image/png');
} // end on load function
img.src = e.target.result;
} //end filereader function
fileReader.readAsDataURL(file);
console.log(fileReader);
images.append(key, fileReader);
numberofimages++;
} else {
errnum++;
errors[errnum]= value=' is a illegal file type';
}
}
});
//image holder finished, remove
jQuery('#'+id).remove();
jQuery.ajax({
url: '/wp-admin/admin-ajax.php',
type: 'POST',
data: images,
cache: false,
processData: false,
contentType: false,
success: function(data) {
console.log(data);
}//end of success function
});
-
readAsDataURLis asynchronous, when it pletes successfully, the load event will fire onfileReader, and the result ofreadAsDataURLwill be in the result property. See FileReader on MDN for more reading. – Paul S. Commented Apr 27, 2014 at 13:25 - onload is included in the proper jquery code......i updated above with more..... – David Commented Apr 27, 2014 at 13:31
- I don't see how you're waiting for the onload before sending after the loop finishes – Paul S. Commented Apr 27, 2014 at 14:10
- hmm i see what you mean.....any idea of a method to wait for the variable amount of values? – David Commented Apr 27, 2014 at 21:16
- actually should be ok now, ill update a answer when i finish it. work in progress if anyone has ments jsfiddle/dheffernan/6Ut59 – David Commented Apr 28, 2014 at 1:07
1 Answer
Reset to default 1ok thanks to PaulS for pointing me in the right direction....updated jQuery below........the php up top wont work with this (im cutting out the ajax even though i have included a note below to show where it goes) the array is different as i added in the filename as well as the base64 url.
jsfiddle http://jsfiddle/dheffernan/6Ut59/
Basically the flow is,
1.Check max files allowed
2 & then for each file check it does not exceed it.
3 Call filereader, when loaded, call resizeBase64img (thanks to the person who submitted that)
4. if on the last file to be processed -- submit FormData via Ajax
5.When file returns input div to show image & if full remove file input
function resizeBase64Img(base64, width, height) {
var canvas = document.createElement("canvas");
canvas.width = width;
canvas.height = height;
var context = canvas.getContext("2d");
var deferred = $.Deferred();
$("<img/>").attr("src", base64).load(function() {
context.scale(width/this.width, height/this.height);
context.drawImage(this, 0, 0);
deferred.resolve($("<img/>").attr("src", canvas.toDataURL('image/jpg')));
});
return deferred.promise();
}
function readFile(file) {
var reader = new FileReader();
var deferred = $.Deferred();
reader.onload = function(event) {
deferred.resolve(event.target.result);
};
reader.onerror = function() {
deferred.reject(this);
};
if (/^image/.test(file.type)) {
reader.readAsDataURL(file);
} else {
reader.readAsText(file);
}
return deferred.promise();
}
jQuery(document).on('change', '.imageup', function(event){
var maximages=4;
var imagecount=jQuery("#imagesholder > div").length;
var length= this.files.length;
var images= new FormData;
var processKey=0;
var i=1;
jQuery.each(event.target.files, function(key, value){
// number of images control.
imagecount++;
if(imagecount > maximages) {
var full=true;
jQuery('.imageup').remove();
jQuery('#imageinput').html("Image Quota Full, Please delete some images if you wish to change them");
return;
} else if (imagecount == maximages) {
var full=true;
jQuery('.imageup').remove();
jQuery('#imageinput').html('<div class="image-box-full">Image Quota Full: delete images to change them</div>');
}
//call resize functions
var name=value;
$.when( readFile(value) ).done(function(value) {
resizeBase64Img(value, 300, 200).done(function(newImg){
images[processKey]=[];
images[processKey]['url']=newImg[0].src;
images[processKey]['name']=name.name;
processKey++;
if(length===processKey) {
//----------------INSERT AJAX TO RUN HERE SUBMITTING IMAGES (THE FORMDATA) E.G
jQuery.ajax({
url: '/wp-admin/admin-ajax.php',
type: 'POST',
data: images,
cache: false,
processData: false,
contentType: false,
success: function(data) {
console.log(data);
}
});
}
$('#imagesholder').append('<div id="delete'+i+'">'+'<div class="image-box"><div class="box-image"><img src="'+newImg[0].src+'" style="width:50px;"/></div><div class="image-box-text">'+name.name+'</div><input type="image" src="http://testserverdavideec.mx.nf/wp-content/uploads/2014/04/success_close.png" class="deletebutton" id="delete/i'+i+'"/></div> </div>');
i++;
if(full === true) {
jQuery('.image-box-full').show();
}
});
});//end when
});//end each
jQuery(this).val('');
});//end on change
发布者：admin，转转请注明出处：http://www.yc00.com/questions/1745036557a4607554.html
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