php - How can i upload image with ajax in codeigniter?

Question

I'm trying to upload image with jQuery and ajax function, and how can I fetch all details of image file, like in php we use $_FILE()

Here is my code

JS

$("#uploadimg" ).click(function() {
     $( "#file" ).click();
});

$( "#file" ).change(function(e) {
    var file=$('#file').val();
    alert(file);
    die();
    e.preventDefault();
    $.ajax({
        url:'http://localhost/JSG/blog/uploadimg',
        secureuri:false,
        type: "POST",
        fileElementId:'image',
        dataType: 'text',
        data:{ file: file },
        cache: true,
        success: function (data){
            alert(data);
            console.log(data);
        },
    });
});

Controller

public function uploadimg()
{
    $var = $_POST['file'];
    print_r($var);
    if($this->input->post('file')) {
        $config['upload_path'] = 'upload'; 
        $config['file_name'] = $var;
        $config['overwrite'] = 'TRUE';
        $config["allowed_types"] = 'jpg|jpeg|png|gif';
        $config["max_size"] = '1024';
        $config["max_width"] = '400';
        $config["max_height"] = '400';
        $this->load->library('upload', $config);

        if(!$this->upload->do_upload()) {
            $this->data['error'] = $this->upload->display_errors();
            print_r( $this->data['error']);
        } else {
            print_r("success");
        }
    }
}

View

<form role="form">
    <div class="form-group">
        <label for="recipient-name" class="control-label">Blog Title:</label>
        <input type="text" class="form-control" id="recipient-name">
    </div>
    <div class="form-group">
        <label for="message-text" class="control-label">Message:</label>
        <textarea class="form-control" id="message-text"></textarea>
    </div>
    <div class="form-group">
        <label for="message-text" class="control-label">Upload image:</label>
        <img src="<?php echo base_url();?>assest/img/blank.png" alt="Blank image" id="uploadimg" class="img-thumbnail">
        <input style="display:none" id="file" value=" " type="file" class="file" data-show-preview="false">
    </div>
</form>

Response

C:fakepathKoala.jpg You did not select a file to upload.

Please help

Answer 1

You can to use FormData api in html5.

Your form must be:

<form enctype="multipart/form-data" accept-charset="utf-8" name="formname" id="formname"  method="post" action="">

Then jquery:

function uploadImage() {

    if (typeof FormData !== 'undefined') {

        // send the formData
        var formData = new FormData( $("#formID")[0] );

        $.ajax({
            url : baseUrl + 'uploadImage',  // Controller URL
            type : 'POST',
            data : formData,
            async : false,
            cache : false,
            contentType : false,
            processData : false,
            success : function(data) {
                successFunction(data);
            }
        });

    } else {
       message("Your Browser Don't support FormData API! Use IE 10 or Above!");
    }   
}

Then in the controller you will get the files in $_FILES array.