Question

我正在使用jQuery form plugin上传文件并显示进度条。

JS代码：

var bar = $('.bar');
var percent = $('.percent');
var status = $('#status');

var options = { 
    target:     '.result', 
    url:        'slider_insert_now.php', 



    beforeSend: function() {


    var img_file = $.trim($(".img_file").val());

    if(img_file==$.trim('')){

    $(".result").html('<span class="error">No file selected</span>');


    return false; 

    }else{

    status.empty();
    var percentVal = '0%';
    bar.width(percentVal)
    percent.html(percentVal);

    return true;
 }


},
uploadProgress: function(event, position, total, percentComplete) {
var percentVal = percentComplete + '%';
bar.width(percentVal)
percent.html(percentVal);
},
success: function() {
var percentVal = '100%';
bar.width(percentVal)
percent.html(percentVal);
},
complete: function(xhr) {
status.html(xhr.responseText);
}



}; 



$('#form_upload').ajaxForm(options);

HTML：

<div class="result"></div>


    <form id="form_upload" action="javascript:void(0)" method="POST" enctype="multipart/form-data">

    <div class="progress">
<div class="bar"></div>
<div class="percent">0%</div>
</div>
<div id="status"></div>



    <input type="file" value="" name="img_file" class="img_file" />

    <br></br>

    <input type="submit" value="Upload the Image" />


    </form>

在beforeSend函数中，我使用return false来阻止表单提交自己。但它不起作用。我怎样才能做到这一点？

Answer 1

在你的html中删除javascript：void（0）并将＃替换为，并使用event.preventDefault（）;你在哪里触发提交。像这样：

$(document).on('click', '#submitname', function (event) {
 event.preventDefault();
  $.ajax({
    url: 'somepage.php',
    type: 'post',
    dataType:'html',   
    data: $('#formname').serialize(),
    success: function(response, textStatus, jqXHR){

     ///Do something

},
   error: function(jqXHR, textStatus, errorThrown){
      console.log('error(s):'+textStatus, errorThrown);
   }
 });
});

Answer 2

要中止当前'in run'请求，你需要中止它;）在beforeSend回调中，第一个参数是jqXHR对象：

beforeSend: function(jqXHR) {
    //some other code to check if we need to abort current request, if so...
    jqXHR.abort();
}

jQuery表单插件，如何防止表单提交

2 个答案: