javascript - 使用 javascript 4 上传图像

Question

我有一个像这样的图像上传框，它是提交表单的一部分。

<li id="field_1_14" class="gfield field_sublabel_below field_description_above"><label class="gfield_label">Ảnh</label><div class="gfield_description">Ảnh hàng hóa bạn muốn mua hộ</div><div class="ginput_container ginput_container_fileupload"><div id="gform_multifile_upload_1_14" data-settings="{&quot;runtimes&quot;:&quot;html5,flash,html4&quot;,&quot;browse_button&quot;:&quot;gform_browse_button_1_14&quot;,&quot;container&quot;:&quot;gform_multifile_upload_1_14&quot;,&quot;drop_element&quot;:&quot;gform_drag_drop_area_1_14&quot;,&quot;filelist&quot;:&quot;gform_preview_1_14&quot;,&quot;unique_names&quot;:true,&quot;file_data_name&quot;:&quot;file&quot;,&quot;url&quot;:&quot;http:\/\/localhost\/?gf_page=5c28261389c3423&quot;,&quot;flash_swf_url&quot;:&quot;http:\/\/localhost\/wp-includes\/js\/plupload\/plupload.flash.swf&quot;,&quot;silverlight_xap_url&quot;:&quot;http:\/\/localhost\/wp-includes\/js\/plupload\/plupload.silverlight.xap&quot;,&quot;filters&quot;:{&quot;mime_types&quot;:[{&quot;title&quot;:&quot;Allowed Files&quot;,&quot;extensions&quot;:&quot;jpg,gif,png,pdf&quot;}],&quot;max_file_size&quot;:&quot;2097152b&quot;},&quot;multipart&quot;:true,&quot;urlstream_upload&quot;:false,&quot;multipart_params&quot;:{&quot;form_id&quot;:1,&quot;field_id&quot;:14,&quot;_gform_file_upload_nonce_1&quot;:&quot;8b58601a9a&quot;},&quot;gf_vars&quot;:{&quot;max_files&quot;:&quot;10&quot;,&quot;message_id&quot;:&quot;gform_multifile_messages_1_14&quot;,&quot;disallowed_extensions&quot;:[&quot;php&quot;,&quot;asp&quot;,&quot;aspx&quot;,&quot;cmd&quot;,&quot;csh&quot;,&quot;bat&quot;,&quot;html&quot;,&quot;hta&quot;,&quot;jar&quot;,&quot;exe&quot;,&quot;com&quot;,&quot;js&quot;,&quot;lnk&quot;,&quot;htaccess&quot;,&quot;phtml&quot;,&quot;ps1&quot;,&quot;ps2&quot;,&quot;php3&quot;,&quot;php4&quot;,&quot;php5&quot;,&quot;php6&quot;,&quot;py&quot;,&quot;rb&quot;,&quot;tmp&quot;]}}" class="gform_fileupload_multifile" style="position: relative;">
                                        <div id="gform_drag_drop_area_1_14" class="gform_drop_area" style="position: relative;">
                                            <span class="gform_drop_instructions">Drop files here or </span>
                                            <input id="gform_browse_button_1_14" type="button" value="Select files" class="button gform_button_select_files" aria-describedby="extensions_message" tabindex="4" style="z-index: 1;">
                                        </div>
                                    <div id="html5_1ad7o2aq0k8310031upe1gkr1lqf3_container" class="moxie-shim moxie-shim-html5" style="position: absolute; top: 27px; left: 550px; width: 136px; height: 34px; overflow: hidden; z-index: 0;"><input id="html5_1ad7o2aq0k8310031upe1gkr1lqf3" type="file" style="font-size: 999px; opacity: 0; position: absolute; top: 0px; left: 0px; width: 100%; height: 100%;" multiple="" accept="image/jpeg,.jpg,image/gif,.gif,image/png,.png,application/pdf,.pdf"></div></div><span id="extensions_message" class="screen-reader-text">Accepted file types: jpg, gif, png, pdf.</span><div class="validation_message">
                                <ul id="gform_multifile_messages_1_14">
                                </ul>
                            </div></div><div id="gform_preview_1_14"></div></li>

当用户通过拖放或从计算机中选择图像上传图像 test.png 时，会将图像上传到服务器，图像上传框变成这样

<li id="field_1_14" class="gfield field_sublabel_below field_description_above"><label class="gfield_label">Ảnh</label><div class="gfield_description">Ảnh hàng hóa bạn muốn mua hộ</div><div class="ginput_container ginput_container_fileupload"><div id="gform_multifile_upload_1_14" data-settings="{&quot;runtimes&quot;:&quot;html5,flash,html4&quot;,&quot;browse_button&quot;:&quot;gform_browse_button_1_14&quot;,&quot;container&quot;:&quot;gform_multifile_upload_1_14&quot;,&quot;drop_element&quot;:&quot;gform_drag_drop_area_1_14&quot;,&quot;filelist&quot;:&quot;gform_preview_1_14&quot;,&quot;unique_names&quot;:true,&quot;file_data_name&quot;:&quot;file&quot;,&quot;url&quot;:&quot;http:\/\/localhost\/?gf_page=5c28261389c3423&quot;,&quot;flash_swf_url&quot;:&quot;http:\/\/localhost\/wp-includes\/js\/plupload\/plupload.flash.swf&quot;,&quot;silverlight_xap_url&quot;:&quot;http:\/\/localhost\/wp-includes\/js\/plupload\/plupload.silverlight.xap&quot;,&quot;filters&quot;:{&quot;mime_types&quot;:[{&quot;title&quot;:&quot;Allowed Files&quot;,&quot;extensions&quot;:&quot;jpg,gif,png,pdf&quot;}],&quot;max_file_size&quot;:&quot;2097152b&quot;},&quot;multipart&quot;:true,&quot;urlstream_upload&quot;:false,&quot;multipart_params&quot;:{&quot;form_id&quot;:1,&quot;field_id&quot;:14,&quot;_gform_file_upload_nonce_1&quot;:&quot;8b58601a9a&quot;},&quot;gf_vars&quot;:{&quot;max_files&quot;:&quot;10&quot;,&quot;message_id&quot;:&quot;gform_multifile_messages_1_14&quot;,&quot;disallowed_extensions&quot;:[&quot;php&quot;,&quot;asp&quot;,&quot;aspx&quot;,&quot;cmd&quot;,&quot;csh&quot;,&quot;bat&quot;,&quot;html&quot;,&quot;hta&quot;,&quot;jar&quot;,&quot;exe&quot;,&quot;com&quot;,&quot;js&quot;,&quot;lnk&quot;,&quot;htaccess&quot;,&quot;phtml&quot;,&quot;ps1&quot;,&quot;ps2&quot;,&quot;php3&quot;,&quot;php4&quot;,&quot;php5&quot;,&quot;php6&quot;,&quot;py&quot;,&quot;rb&quot;,&quot;tmp&quot;]}}" class="gform_fileupload_multifile" style="position: relative;">
                                        <div id="gform_drag_drop_area_1_14" class="gform_drop_area" style="position: relative;">
                                            <span class="gform_drop_instructions">Drop files here or </span>
                                            <input id="gform_browse_button_1_14" type="button" value="Select files" class="button gform_button_select_files" aria-describedby="extensions_message" tabindex="4" style="z-index: 1;">
                                        </div>
                                    <div id="html5_1ad7o2aq0k8310031upe1gkr1lqf3_container" class="moxie-shim moxie-shim-html5" style="position: absolute; top: 25px; left: 186px; width: 136px; height: 34px; overflow: hidden; z-index: 0;"><input id="html5_1ad7o2aq0k8310031upe1gkr1lqf3" type="file" style="font-size: 999px; opacity: 0; position: absolute; top: 0px; left: 0px; width: 100%; height: 100%;" multiple="" accept="image/jpeg,.jpg,image/gif,.gif,image/png,.png,application/pdf,.pdf"></div></div><span id="extensions_message" class="screen-reader-text">Accepted file types: jpg, gif, png, pdf.</span><div class="validation_message">
                                <ul id="gform_multifile_messages_1_14"></ul>
                            </div></div><div id="gform_preview_1_14"><div id="o_1ad7oetmvfm31gsd11lhsoc1s88f" class="ginput_preview"><img class="gform_delete" src="http://localhost/wp-content/plugins/gravityforms/images/delete.png" onclick="gformDeleteUploadedFile(1,14, this);" alt="Delete this file" title="Delete this file" scale="0"> <strong>test.jpg</strong></div></div></li>

我在表单提交中找到了这部分代码，提交按钮上方

<input type="hidden" name="gform_uploaded_files" id="gform_uploaded_files_1" value="{&quot;input_14&quot;:[{&quot;temp_filename&quot;:&quot;ff301078_input_14_o_1ad7pjak2psd8g4fhpi71ajia.jpg&quot;,&quot;uploaded_filename&quot;:&quot;test.jpg&quot;}]}">

我不想让用户像上面那样上传图像，而是想:

1. 使用 CSS 隐藏图像上传框(完成!)
2. 使用 JavaScript 将“http://localhost/wp-content/uploads/2015/11/myimage.jpg ”上传到该图像框。

myimage.jpg 已在服务器上并且可以公开访问。

有人可以帮我完成步骤(2)吗？

因此，当用户单击表单提交按钮时，用户实际提交的图像是 myimage.jpg。

谢谢。

Answer 1

如果您想要的只是以编程方式将图像设置到框中，而不是让用户上传它。然后你可以使用Jquery并设置图像的src。

var imageSrc = "http://localhost/wp-content/uploads/2015/11/myimage.jpg";

var imageHolder = '<img class="gform_delete" src="'+ imageSrc +'" alt="Delete this file" title="Delete this file" scale="0"><strong>test.jpg</strong>';

$('#gform_preview_1_14').append(imageHolder); // once you append the HTML image will be accessed from the server and loaded.