how to use wordpress upload file/image code in my plugin - wordpress

Question

I am developing a wordpress plugin and I need to have a field where I can upload an image. Since wordpress has a very handly uploader it would be great if I could use that.
anyone know if that's possible?
Thanks

Answer 1

If you only want to upload a file, you don't need the media uploader. A simple form is all you need.
To call the media uploader you need a link like this:
<a onclick="return false;" title="Upload image" class="thickbox" id="add_image" href="media-upload.php?type=image&TB_iframe=true&width=640&height=105">Upload Image</a>
You'll maybe have to append your URL to media-upload.php to make it working.

Answer 2

YOu can use wordpress default media file uploader by using this code and simply retrieve link of image in jquery
<label for="upload_image">
<input id="upload_image" type="text" size="36" name="ad_image" value="http://" />
<input id="upload_image_button" class="button" type="button" value="Upload Image" />
<br />Enter a URL or upload an image
</label>
<?php
add_action('admin_enqueue_scripts', 'my_admin_scripts');
function my_admin_scripts() {
if (isset($_GET['page']) && $_GET['page'] == 'my_plugin_page') {
wp_enqueue_media();
wp_register_script('my-admin-js', WP_PLUGIN_URL.'/my-plugin/my-admin.js', array('jquery'));
wp_enqueue_script('my-admin-js');
}
}
?>
<script>
jQuery(document).ready(function($){
var custom_uploader;
$('#upload_image_button').click(function(e) {
e.preventDefault();
//If the uploader object has already been created, reopen the dialog
if (custom_uploader) {
custom_uploader.open();
return;
}
//Extend the wp.media object
custom_uploader = wp.media.frames.file_frame = wp.media({
title: 'Choose Image',
button: {
text: 'Choose Image'
},
multiple: true
});
//When a file is selected, grab the URL and set it as the text field's value
custom_uploader.on('select', function() {
console.log(custom_uploader.state().get('selection').toJSON());
attachment = custom_uploader.state().get('selection').first().toJSON();
$('#upload_image').val(attachment.url);
});
//Open the uploader dialog
custom_uploader.open();
});
});
</script>

Answer 3

Hi you can use the following code,
<?php
if ( isset( $_POST['submit_image_selector'] ) && isset( $_POST['image_attachment_id'] ) ) :
update_option( 'media_selector_attachment_id', absint( $_POST['image_attachment_id'] ) );
endif;
wp_enqueue_media();
?><form method='post'>
<div class='image-preview-wrapper'>
<img id='image-preview' src='<?php echo wp_get_attachment_url( get_option( 'media_selector_attachment_id' ) ); ?>' width='200'>
</div>
<input id="upload_image_button" type="button" class="button" value="<?php _e( 'Upload image' ); ?>" />
<input type='hidden' name='image_attachment_id' id='image_attachment_id' value='<?php echo get_option( 'media_selector_attachment_id' ); ?>'>
<input type="submit" name="submit_image_selector" value="Save" class="button-primary">
</form>
<?php
$my_saved_attachment_post_id = get_option( 'media_selector_attachment_id', 0 );
?><script type='text/javascript'>
jQuery( document ).ready( function( $ ) {
// Uploading files
var file_frame;
var wp_media_post_id = wp.media.model.settings.post.id; // Store the old id
var set_to_post_id = <?php echo $my_saved_attachment_post_id; ?>; // Set this
jQuery('#upload_image_button').on('click', function( event ){
event.preventDefault();
// If the media frame already exists, reopen it.
if ( file_frame ) {
// Set the post ID to what we want
file_frame.uploader.uploader.param( 'post_id', set_to_post_id );
// Open frame
file_frame.open();
return;
} else {
// Set the wp.media post id so the uploader grabs the ID we want when initialised
wp.media.model.settings.post.id = set_to_post_id;
}
// Create the media frame.
file_frame = wp.media.frames.file_frame = wp.media({
title: 'Select a image to upload',
button: {
text: 'Use this image',
},
multiple: false // Set to true to allow multiple files to be selected
});
// When an image is selected, run a callback.
file_frame.on( 'select', function() {
// We set multiple to false so only get one image from the uploader
attachment = file_frame.state().get('selection').first().toJSON();
// Do something with attachment.id and/or attachment.url here
$( '#image-preview' ).attr( 'src', attachment.url ).css( 'width', 'auto' );
$( '#image_attachment_id' ).val( attachment.id );
// Restore the main post ID
wp.media.model.settings.post.id = wp_media_post_id;
});
// Finally, open the modal
file_frame.open();
});
// Restore the main ID when the add media button is pressed
jQuery( 'a.add_media' ).on( 'click', function() {
wp.media.model.settings.post.id = wp_media_post_id;
});
});
</script>