【发布时间】：2020-07-20 23:29:09
【问题描述】：
我正在尝试添加一种新方法来检查文件类型，然后根据类型检查大小。在这种情况下，我希望允许最大 10MB 的 jpg 文件和 4MB 的 gif、png 和 pdf 文件。上传字段不是必需的，但我仍然需要验证文件类型和类型的最大文件大小。目前，无论文件大小如何，都会显示错误。
我只想在所选文件大于其类型所允许的大小时显示错误。不知道我错过了什么。非常感谢任何帮助或反馈。
这是我的 HTML 代码
<form id="aspnetForm">
<p class="denote-required">
<span class="required-symbol">*</span> = Required Field
</p>
<fieldset>
<legend><h3>Details of item lost</h3></legend>
<div class="form-group has-float-label required">
<input
type="text"
id="date"
name="date"
class="form-control"
data-toggle="datetimepicker"
data-target="#date"
placeholder=" "
required />
<label for="date">Date item lost</label>
</div>
<div class="form-group has-float-label required">
<input
type="text"
id="route"
name="route"
class="form-control"
placeholder=" "
required />
<label for="route">Route</label>
</div>
<div class="form-group has-float-label required">
<textarea
id="itemDescription"
name="itemDescription"
class="form-control"
aria-describedby="descriptionHelpBlock"
placeholder=" "
required></textarea>
<label for="itemDescription">Description</label>
<div id="descriptionHelpBlock" class="form-text text-muted">
<small>Please be as descriptive as possible, such as color, size, brand name etc.</small>
</div>
</div>
<div class="input-group">
<div class="custom-file">
<input
type="file"
id="fileUpload"
name="fileUpload"
class="custom-file-input"
aria-describedby="fileUploadHelpBlock" />
<label for="fileUpload" class="custom-file-label">Add photo</label>
</div>
<div id="fileUploadHelpBlock" class="form-text text-muted">
<small>File type can be .jpg, .jpeg, .gif or .png. The maximum file size limit for .jpeg/.jpg files is 10mb. The maximum file size limit for .gif and .png is 4mb</small>
</div>
</div>
</fieldset>
<fieldset>
<legend><h3>Your contact infomation</h3></legend>
<div class="form-group has-float-label required">
<input
type="text"
id="name"
name="name"
class="form-control"
placeholder=" "
required />
<label for="name">Name</label>
</div>
<div class="form-group has-float-label required">
<input
type="email"
id="email"
name="email"
class="form-control"
placeholder=" "
required />
<label for="email">Email</label>
</div>
<div class="form-group has-float-label">
<input
type="text"
id="phone"
name="phone"
class="form-control"
placeholder=" " />
<label for="phone">Phone</label>
</div>
</fieldset>
<fieldset>
<legend><h3>Return by mail</h3></legend>
<div class="custom-control custom-checkbox">
<input
type="checkbox"
id="mailItem"
name="mailItem"
class="custom-control-input" />
<label for="mailItem" class="custom-control-label">If found, return item by mail</label>
</div>
<div id="mailingAddress">
<p>Please provide your mailng address to have the item mailed to you, if we are able to find it.</p>
<div class="form-group has-float-label required">
<input
type="text"
id="address"
name="address"
class="form-control"
placeholder=" " />
<label for="address">Address</label>
</div>
<div class="form-group has-float-label">
<input
type="text"
id="address2"
name="address2"
class="form-control"
placeholder=" " />
<label for="address2">Address 2</label>
</div>
<div class="form-group has-float-label required">
<input
type="text"
id="city"
name="city"
class="form-control"
placeholder=" " />
<label for="city">City</label>
</div>
<div class="form-group has-float-label required">
<input
type="text"
id="state"
name="state"
class="form-control"
placeholder=" " />
<label for="state">State</label>
</div>
<div class="form-group has-float-label required">
<input
type="text"
id="zipCode"
name="zipCode"
class="form-control"
placeholder=" " />
<label for="zipCode">Zip code</label>
</div>
</div>
</fieldset>
<hr />
<div class="ml-auto text-center">
<button type="submit" class="btn btn-primary">Submit</button>
</div>
这里是js代码
const validateForm = (function ($, window, document, undefined) {
$.validator.addMethod('maxFileSize', function (value, element) {
return this.optional(element) || checkFileSize(value, element);
});
var checkFileSize = function (fileNames, files) {
const ext = $(files);
if ($.inArray(ext, ['gif', 'jpeg', 'jpg', 'png', 'pdf']) >= 0) {
// Check file size
const fileSize = $(element)[0].files[0].size;
if (ext === 'gif' || ext === 'png' || ext === 'pdf') {
if (fileSize > 4000000) {
return false;
} else {
return true;
}
} else {
if (ext === 'jpeg' || ext === 'jpg') {
if (fileSize > 10000000) {
return false;
} else {
return true;
}
}
}
}
}
const init = function () {
// Set rules and messages
$('#aspnetForm').validate({
debug: true,
errorElement: 'div',
errorClass: 'is-invalid',
validClass: 'is-valid',
rules: {
fileUpload: {
required: false,
accept: 'image/gif,image/jpg,image/jpeg,image/png,application/pdf,',
maxFileSize: true,
},
},
messages: {
date: 'Please select a date.',
route: 'Please enter a route.',
description: 'Please enter a description.',
fileUpload: {
accept: 'The file selected is not a valid type.',
maxFileSize: 'The file selected is too large.',
},
name: 'Please provide your name.',
email: 'Please enter a valid email',
address: 'Please enter your street address.',
city: 'Please enter a city.',
state: 'Please enter a state.',
zipCode: 'Please enter a zip code.',
},
errorPlacement: function (error, element) {
// Add the `help-block` class to the error element
error.addClass('help-block');
element
.parents('.form-group, .input-group, .custom-control')
.addClass('has-feedback');
if (
element.prop('type') === 'checkbox' ||
element.prop('type') === 'radio'
) {
error.appendTo(element.parents('.custom-control'));
} else if (
element.prop('type') === 'file'
) {
error.appendTo(element.parents('.input-group'));
} else {
error.appendTo(element.parents('.form-group, .input-group'));
}
},
highlight: function (element, errorClass, validClass) {
$(element)
.parents('.form-group, .input-group, .custom-control')
.addClass(errorClass)
.removeClass(validClass);
// Sets error icon.
$(element)
.next('.alert-red')
.show();
},
unhighlight: function (element, errorClass, validClass) {
$(element)
.parents('.form-group, .input-group, .custom-control')
.addClass(validClass)
.removeClass(errorClass);
$(element)
.next('.alert-red')
.remove();
},
});
// Show address form when checked
$('#mailingAddress').hide();
$('#mailItem').click(function () {
if ($(this).is(':checked')) {
$('#mailingAddress').fadeIn(300);
$('#mailingAddress [aria-required="true"]').attr('required', 'required');
} else if ($(this).is(':not(:checked)')) {
$('#mailingAddress').fadeOut(300);
$('#mailingAddress [aria-required="true"]').removeAttr('required', 'required');
}
});
};
return {
init: init,
checkFileSize: checkFileSize,
};
})(jQuery, window, document);
$(document).ready(function () {
validateForm.init();
});
【问题讨论】：