动态添加表单输入字段

Question

HTML 表单

 <div class="module">
            <div class="moduleTitle">Upload Photos</div>            
                   <form id="upload" method="post" action="actions/upload.php" enctype="multipart/form-data">
            <div id="drop">
                Drop Here

                <a>Browse</a>
                <input type="file" name="upl" multiple />
            </div>

            <form onSubmit="addTags();return false;" id="tagAddForm">
            <ul>
                <!-- The file uploads will be shown here -->
            </ul>
                    <input type="submit" name="login" value="Add Tags" class="submit" id="login"/>
                    </form>
                    </div>
                    </form>

Javascript 文件

$(function(){

    var ul = $('#upload ul'); 

    $('#drop a').click(function(){
        // Simulate a click on the file input button
        // to show the file browser dialog
        $(this).parent().find('input').click();
    });

    // Initialize the jQuery File Upload plugin
    $('#upload').fileupload({

        // This element will accept file drag/drop uploading
        dropZone: $('#drop'),

        // This function is called when a file is added to the queue;
        // either via the browse button, or via drag/drop:
        add: function (e, data) {

             var tpl = $('<li class="working uploaded"><input type="text" value="0" data-width="48" data-height="48"'+
                ' data-fgColor="#0788a5" data-readOnly="1" data-bgColor="#3e4043" /><p></p><span></span></li>');



        // Append the file name and file size      
            tpl.find('p').text(data.files[0].name);



            // Add the HTML to the UL element
            data.context = tpl.appendTo(ul);

            // Initialize the knob plugin
            tpl.find('input').knob();

            // Listen for clicks on the cancel icon
            tpl.find('span').click(function(){

                if(tpl.hasClass('working')){
                    jqXHR.abort();
                }

                tpl.fadeOut(function(){
                    tpl.remove();
                });

            });

            // Automatically upload the file once it is added to the queue
            var jqXHR = data.submit();
        },

        progress: function(e, data){

            // Calculate the completion percentage of the upload
            var progress = parseInt(data.loaded / data.total * 100, 10);

            // Update the hidden input field and trigger a change
            // so that the jQuery knob plugin knows to update the dial
            data.context.find('input').val(progress).change();

            if(progress == 100){
                data.context.removeClass('working');
            }
        },

        fail:function(e, data){
            // Something has gone wrong!
            data.context.addClass('error');
        }

    });


    // Prevent the default action when a file is dropped on the window
    $(document).on('drop dragover', function (e) {
        e.preventDefault();
    });

    // Helper function that formats the file sizes
    function formatFileSize(bytes) {
        if (typeof bytes !== 'number') {
            return '';
        }

        if (bytes >= 1000000000) {
            return (bytes / 1000000000).toFixed(2) + ' GB';
        }

        if (bytes >= 1000000) {
            return (bytes / 1000000).toFixed(2) + ' MB';
        }

        return (bytes / 1000).toFixed(2) + ' KB';
    }

});

Answer 1

这是一个演示如何根据文件数组动态生成(input/li)s。

//Create an empty container
var $elems = $();
//Cycle thru the files
$.each(data.files, function(idx, file) {
    //Create an input with attrs
    var $input = $("<input/>", {
        'type': 'text',
        'placeholder': 'separate tags with commas',
        'name': file["name"]
    });
    //Create list element & append input
    var $li = $("<li/>").append($input);
    //Populate the container with the list item
    $elems = $elems.add($li);
});
//Append all list items
$("#tagAddForm > UL").append($elems);

还有一个working demo，其中包含我为演示定义的示例文件。

Another one 可以选择根据文件名显示图像缩略图。