javascript - 如何使用 jquery 验证添加以像素为单位的验证尺寸？

Question

我的 jquery 验证如下:

store: {
    rules: {
        banner: {
            required: true
        }
    },
    messages: {
        banner: 'The banner must be filled',
    },
    errorElement: 'span',
    errorPlacement: errorPlacement,
    highlight: highlight,
    unhighlight: unhighlight
},

如果用户未上传尺寸为 1170 x 300 像素的横幅，则会出现如下消息:

Please upload an image with 1170 x 300 pixels dimension

我该怎么做？

Answer 1

您需要创建自定义验证方法

$.validator.addMethod('dimention', function(value, element, param) {
    if(element.files.length == 0){
        return true; <--- check here if file not added than return true for not check file dimention
    }
    var width = $(element).data('imageWidth');
    var height = $(element).data('imageHeight');
    if(width == param[0] && height == param[1]){
        return true;
    }else{
        return false;
    }
},'Please upload an image with 1170 x 300 pixels dimension');

并且您需要在图像更改时设置参数imageWidth和imageHeight，如下所示

// files is id of your input

<input type="file" id="files" name="name" />

$('#files').change(function() {
    $('#files').removeData('imageWidth');
    $('#files').removeData('imageHeight');
    var file = this.files[0];
    var tmpImg = new Image();
    tmpImg.src=window.URL.createObjectURL( file ); 
    tmpImg.onload = function() {
        width = tmpImg.naturalWidth,
        height = tmpImg.naturalHeight;
        $('#files').data('imageWidth', width);
        $('#files').data('imageHeight', height);
    }
});

然后像这样调用

rules: {
    banner: {
        dimention:[1170,300]
    }
}

工作 fiddle 链接 fiddle link