javascript - 在选择图像时预览编辑图像的图像(即时)

Question

我选择了图片并在提交表单之前进行了预览。但是我想在选择图像并预览并提交文件后即时编辑文件。

<input type ="file" accept="image/*" id="image"  name="image"  onchange="preview();">
<p>
   <canvas id ="can1" height="0px";></canvas>
</p> 

js代码:

<script type="text/javascript">
var img = null;
var canvas1 = document.getElementById("can1");

function preview() {
  var inputfile = document.getElementById("image");
  img = new SimpleImage(inputfile);
  img.drawTo(canvas1);
}
</script>

实际上在提交表单后，图像处理在 Controller 中是这样的:

if ($request->hasFile('image')) {
        $filename = time().'-'.$request->image->getClientOriginalName();

        $image = Image::make($request->file('image')->getRealPath());
        $footer = Image::make(public_path('footer.png'));
        $path="photos/shares/uploads/{$filename}";


 // Get dimensions for specified images
        $width_x=$image->width();
        $height_x=$image->height();

        $width_y=$footer->width();

// resize the image to a width of $width_x and constrain aspect ratio (auto height)

        $footer->resize($width_x,null, function ($constraint) {
            $constraint->aspectRatio();
        });

        $height_y=$footer->height();

        $img_canvas = Image::canvas($width_x, $height_x+$height_y);
        $img_canvas->insert(Image::make($request->file('image')->getRealPath()));
        $img_canvas->insert($footer, 'bottom'); // add offset
        $img_canvas->save(public_path($path));

但我希望它在选择图像并显示预览和提交表单后立即发生。

Answer 1

在你的 javascript 中使用这段代码

$("#image").change(function(e) {
var data = new FormData();
data.append('image', $('input[type=file]')[0].files[0]);
data.append('_token', "{{ csrf_token() }}");
$.ajax({
        url:'{{url('/my-admin/imageupload')}}',
        type: 'POST',
        data : data,
        enctype : 'multipart/form-data',
        contentType: false,
        processData: false,
        success: function( data ) {
            var baseUrl = "{{asset('')}}";
            var imageUrl = baseUrl + data.msg;
            $('#changeimage').html('<img src="'+ imageUrl +'" height="100px" width="100px">');
        },
        error: function() {
            alert('error');
        }
   });      
 });