如何使用FormData进行AJAX文件上传?

问题描述：

这是我使用拖放功能动态生成的HTML.

This is my HTML which I'm generating dynamically using drag and drop functionality.

<form method="POST" id="contact" name="13" class="form-horizontal wpc_contact" novalidate="novalidate" enctype="multipart/form-data">
<fieldset>
    <div id="legend" class="">
        <legend class="">file demoe 1</legend>
        <div id="alert-message" class="alert hidden"></div>
    </div>

    <div class="control-group">
        <!-- Text input-->
        <label class="control-label" for="input01">Text input</label>
        <div class="controls">
            <input type="text" placeholder="placeholder" class="input-xlarge" name="name">
            <p class="help-block" style="display:none;">text_input</p>
        </div>
        <div class="control-group">  </div>
        <label class="control-label">File Button</label>

        <!-- File Upload --> 
        <div class="controls">
            <input class="input-file" id="fileInput" type="file" name="file">
        </div>
    </div>
    <div class="control-group">    

        <!-- Button --> 
        <div class="controls">
            <button class="btn btn-success">Button</button>
        </div>
    </div>
</fieldset>
</form>

这是我的JavaScript代码:

This is my JavaScript code:

<script>
    $('.wpc_contact').submit(function(event){
        var formname = $('.wpc_contact').attr('name');
        var form = $('.wpc_contact').serialize();               
        var FormData = new FormData($(form)[1]);

        $.ajax({
            url : '<?php echo plugins_url(); ?>'+'/wpc-contact-form/resources/js/tinymce.php',
            data : {form:form,formname:formname,ipadd:ipadd,FormData:FormData},
            type : 'POST',
            processData: false,
            contentType: false,
            success : function(data){
            alert(data); 
            }
        });
   }

答

要正确使用表格数据，您需要执行2个步骤.

For correct form data usage you need to do 2 steps.

准备工作

您可以将整个表单交给FormData()进行处理

You can give your whole form to FormData() for processing

var form = $('form')[0]; // You need to use standard javascript object here
var formData = new FormData(form);

或为FormData()指定确切数据

or specify exact data for FormData()

var formData = new FormData();
formData.append('section', 'general');
formData.append('action', 'previewImg');
// Attach file
formData.append('image', $('input[type=file]')[0].files[0]);

发送表单

带有jquery的Ajax请求将如下所示:

Ajax request with jquery will looks like this:

$.ajax({
    url: 'Your url here',
    data: formData,
    type: 'POST',
    contentType: false, // NEEDED, DON'T OMIT THIS (requires jQuery 1.6+)
    processData: false, // NEEDED, DON'T OMIT THIS
    // ... Other options like success and etc
});

此后，它将发送ajax请求，就像您使用enctype="multipart/form-data"

After this it will send ajax request like you submit regular form with enctype="multipart/form-data"

更新:如果没有选项中的type:"POST"，此请求将无法工作，因为所有文件都必须通过POST请求发送.

Update: This request cannot work without type:"POST" in options since all files must be sent via POST request.

注意::contentType: false仅在从jQuery 1.6开始可用

如何使用FormData进行AJAX文件上传?

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