Question

我正在尝试在bootstrap模式中上传和裁剪图像，然后我跟着codepen example。除了jquery，bootstrap等我没有导入任何裁剪库。我收到错误，

“未捕获的ReferenceError：未定义imageCrop 在cropImage（upload-image.js？v = 20180410173156：55）在Image.img.onload（upload-image.js？v = 20180410173156：41）“

我应该使用任何库或我想写的任何JavaScript？我是javascript的新手

我的Javascript：

$('#drop').on('click', function() {
    $('#fileUpload').trigger('click');
});

$('#fileUpload').on('change', function(e) {
    addImage(e.target);
});

$("#drop").on("dragover", function(e) {
    e.preventDefault();
    e.stopPropagation();
    $(this).addClass('dragging');
});

$("#drop").on("dragleave", function(e) {
    $(this).removeClass('dragging');
});

$("#drop").on("drop", function(e) {
    e.preventDefault();
    e.stopPropagation();
    var data = e.dataTransfer || e.originalEvent.dataTransfer;
    addImage(data);
});

function addImage(data) {
    var file = data.files[0];
    if (file.type.indexOf('image') === -1) {
        alert('Sorry, the file you uploaded doesn\'t appear to be an image.');
        return false;
    }

    var reader = new FileReader();
    reader.onload = function(event) {
        var img = new Image();
        img.onload = function() {
            if (img.width < 200 || img.height < 200) {
                alert('Sorry, the image you uploaded doesn\'t appear to be large enough.');
                return false;
            }
            cropImage(img);
        }
        img.src = event.target.result;
    }
    reader.readAsDataURL(file);
}

function cropImage(originalImage) {

    $(originalImage).attr('id', 'fullImage');
    $('#imageResize').html(originalImage);
    // $('#sectionDragAndDrop').addClass('hidden');
    $('#sectionResize').removeClass('hidden');

    var newImage = new imageCrop('#fullImage', 200, 200);

    $('#crop').on('click', function() {
        var results = newImage.crop();
        $('#thumbnail').html(results.img);
        // $('#sectionResize').addClass('hidden');
        $('#sectionThumbnail').removeClass('hidden');
    });

}

Answer 1

您需要包含imageCrop定义，在您的codepen链接之后，您将在外部脚本中找到JS设置中的脚本：ImageCrop。

未捕获的ReferenceError：未定义imageCrop

1 个答案: