1.准备
下载jQuery1.x版本（测试用v1.12.4）
下载jQuery的form插件（下载地址）
本例子是通过Java后端进行测试的，后端为spring boot框架
2.后端代码
1测试的controller代码
package com.example;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class TestController {
@GetMapping(value = { "/", "/index.html" })
public Object index() {
return new ModelAndView("index");
}
@PostMapping(value = { "/fileupload.do" }, produces = { "text/html;charset=UTF-8" })
@ResponseBody
public Object fileUpload(String name, MultipartFile file) {
try {
if (file.getBytes().length > 0) {
return "{\"message\":\"success\",\"name\":\"" + name + "\"}";
} else {
return "{\"message\":\"fail\"}";
}
} catch (Exception e) {
throw new RuntimeException("文件上传异常");
}
}
@PostMapping(value = { "/fileupload2.do" }/*, produces = { "text/html;charset=UTF-8" }*/)
public void fileUpload2(String name, MultipartFile file,HttpServletResponse response) {
try {
if (file.getBytes().length > 0) {
response.setContentType("");
response.setHeader("Content-Type", "text/html;charset=UTF-8");
response.getWriter().write("{\"message\":\"success\",\"name\":\"" + name + "\"}");
} else {
response.setHeader("Content-Type", "text/html;charset=UTF-8");
response.getWriter().write("{\"message\":\"fail\"}");
}
} catch (Exception e) {
throw new RuntimeException("文件上传异常");
}
}
}
注意:上面的第一种写法produces = { "text/html;charset=UTF-8" }必须这样写,其他写法则会出现各种问题
3.后端代码
1HTML页面代码
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8"/>
<title>测试</title>
</head>
<body>
<form method="post" enctype="multipart/form-data" id="upload-form">
<input type="text" name="name" />
<input type="file" name="file"/>
</form>
<button type="button" id="btn-upload">上传测试</button>
<script type="text/javascript" src="/libs/jquery.min.js"></script>
<script type="text/javascript" src="/libs/jquery.form.js"></script>
<script type="text/javascript" src="/libs/index.js"></script>
</body>
</html>
2.index.js文件代码
/**
*
*/
$(function() {
$('#btn-upload').click(function(){
var options = {
url : "/fileupload.do",
success : function(data) {
var returnData = JSON.parse(data);
alert(data);
},
resetForm : true,
};
$("#upload-form").ajaxSubmit(options);
})
})4jQuery form控件API
Options
Note: All standard $.ajax options can be used.
beforeSerialize
Callback function invoked prior to form serialization. Provides an opportunity to manipulate the form before its values are retrieved. Returning false from the callback will prevent the form from being submitted. The callback is invoked with two arguments: the jQuery wrapped form object and the options object.
beforeSerialize: function($form, options) {
// return false to cancel submit
}beforeSubmit
Callback function invoked prior to form submission. Returning false from the callback will prevent the form from being submitted. The callback is invoked with three arguments: the form data in array format, the jQuery wrapped form object, and the options object.
beforeSubmit: function(arr, $form, options) {
// form data array is an array of objects with name and value properties
// [ { name: 'username', value: 'jresig' }, { name: 'password', value: 'secret' } ]
// return false to cancel submit
}filtering
Callback function invoked before processing fields. This provides a way to filter elements.
filtering: function(el, index) {
if ( !$(el).hasClass('ignore') ) {
return el;
}
}clearForm
Boolean flag indicating whether the form should be cleared if the submit is successful
data
An object containing extra data that should be submitted along with the form.
data: { key1: 'value1', key2: 'value2' }
dataType
Expected data type of the response. One of: null, 'xml', 'script', or 'json'. The dataType option provides a means for specifying how the server response should be handled. This maps directly to jQuery's dataType method. The following values are supported:
- 'xml': server response is treated as XML and the 'success' callback method, if specified, will be passed the responseXML value
- 'json': server response will be evaluted and passed to the 'success' callback, if specified
- 'script': server response is evaluated in the global context
delegation
true to enable support for event delegation requires jQuery v1.7+
// prepare all existing and future forms for ajax submission
$('form').ajaxForm({
delegation: true
});error
Callback function to be invoked upon error.
forceSync
Only applicable when explicity using the iframe option or when uploading files on browses that don't support XHR2. Set to true to remove the short delay before posting form when uploading files. The delay is used to allow the browser to render DOM updates prior to performing a native form submit. This improves usability when displaying notifications to the user, such as "Please Wait..."
iframe
Boolean flag indicating whether the form should always target the server response to an iframe instead of leveraging XHR when possible.
iframeSrc
String value that should be used for the iframe's src attribute when an iframe is used.
iframeTarget
Identifies the iframe element to be used as the response target for file uploads. By default, the plugin will create a temporary iframe element to capture the response when uploading files. This options allows you to use an existing iframe if you wish. When using this option the plugin will make no attempt at handling the response from the server.
method
The HTTP method to use for the request (e.g. 'POST', 'GET', 'PUT').
replaceTarget
Optionally used along with the the target option. Set to true if the target should be replaced or false if only the target contents should be replaced.
resetForm
Boolean flag indicating whether the form should be reset if the submit is successful
semantic
Boolean flag indicating whether data must be submitted in strict semantic order (slower). Note that the normal form serialization is done in semantic order with the exception of input elements of type="image". You should only set the semantic option to true if your server has strict semantic requirements and your form contains an input element of type="image".
success
Callback function to be invoked after the form has been submitted. If a 'success' callback function is provided it is invoked after the response has been returned from the server. It is passed the following standard jQuery arguments:
data, formatted according to the dataType parameter or the dataFilter callback function, if specifiedtextStatus, stringjqXHR, object$formjQuery object containing form element
target
Identifies the element(s) in the page to be updated with the server response. This value may be specified as a jQuery selection string, a jQuery object, or a DOM element.
type
The HTTP method to use for the request (e.g. 'POST', 'GET', 'PUT').
An alias for method option. Overridden by the method value if both are present.
uploadProgress
Callback function to be invoked with upload progress information (if supported by the browser). The callback is passed the following arguments:
- event; the browser event
- position (integer)
- total (integer)
- percentComplete (integer)
url
URL to which the form data will be submitted.
Utility Methods
formSerialize
Serializes the form into a query string. This method will return a string in the format: name1=value1&name2=value2
var queryString = $('#myFormId').formSerialize();fieldSerialize
Serializes field elements into a query string. This is handy when you need to serialize only part of a form. This method will return a string in the format: name1=value1&name2=value2
var queryString = $('#myFormId .specialFields').fieldSerialize();fieldValue
Returns the value(s) of the element(s) in the matched set in an array. This method always returns an array. If no valid value can be determined the array will be empty, otherwise it will contain one or more values.
resetForm
Resets the form to its original state by invoking the form element's native DOM method.
clearForm
Clears the form elements. This method emptys all of the text inputs, password inputs and textarea elements, clears the selection in any select elements, and unchecks all radio and checkbox inputs. It does not clear hidden field values.
clearFields
Clears selected field elements. This is handy when you need to clear only a part of the form.
File Uploads
The Form Plugin supports use of XMLHttpRequest Level 2 and FormData objects on browsers that support these features. As of today (March 2012) that includes Chrome, Safari, and Firefox. On these browsers (and future Opera and IE10) files uploads will occur seamlessly through the XHR object and progress updates are available as the upload proceeds. For older browsers, a fallback technology is used which involves iframes. More Info
https://blog.xqlee.com/article/275.html
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