使用Javascript提交表单并使用ajaxForm处理

时间:2019-01-26 14:57:35

标签: javascript jquery html ajax forms

我当前正在更改系统,以便在提交表单时具有加载进度栏。

在我的旧系统中,我有以下表格和脚本来检查文件是否存在并且格式正确:

Index.php

<form  method="POST" enctype="multipart/form-data" id="myForm" action="upload.php">

    <input type="file" name="imageSent" id="imgFile" class="inputImg" />
    <label for="imgFile" class="labelForImgF">
        <span>Select Img</span>
    </label>

    <button type="button" class="btnSubmit" onclick='verifyImg();'>
        <span>Send</span>
    </button>

</form>

    <script>
function verifyImg() {
    document.getElementById("warning").innerHTML = "";
    var fileName = document.getElementById("imgFile");
    if(fileName.files.item(0) == null) {
        document.getElementById("warning").innerHTML = "You must select an img";
    } else {
        if(!isValidFileType(fileName.files.item(0).name,'image')) {
            document.getElementById("warning").innerHTML = "Bad format";
        } else {
            document.getElementById('myForm').submit();
            document.getElementById("warning").innerHTML = "Sucess";
        }
    }
}

var extensionLists = {}; 
extensionLists.image = ['jpg', 'nef', 'bmp', 'png', 'jpeg', 'svg', 'webp', '3fr', 'arw', 'crw', 'cr2', 'cr3', 'dng', 'kdc', 'mrw', 'nrw', 'orf', 'ptx', 'pef', 'raf', 'R3D', 'rw2', 'srw', 'x3f'];

function isValidFileType(fName, fType) {
return extensionLists[fType].indexOf(fName.toLowerCase().split('.').pop()) > -1;
}
</script>

这是我的新系统,它可以与ajax一起很好地工作,但是我无法检查格式是否正确,因为只要将onclick:verifyImg();放在按钮中,表单提交就不会通过Ajax系统

这是我的新代码:

<form  method="POST" enctype="multipart/form-data" id="myForm" action="upload.php">

    <input type="file" name="imageSent" id="imgFile" class="inputImg" />
    <label for="imgFile" class="labelForImgF">
        <span>Select Img</span>
    </label>

    <button class="btnSubmit">
        <span>Send</span>
    </button>

</form>
<div id="bararea">
    <div id="bar"></div>
</div>

<div id="percent"></div>
<div id="status"></div>
<script>
$(function() {
$(document).ready(function(){
    var bar = $('#bar')
    var percent = $('#percent');
    var status = $('#status');

    $('form').ajaxForm({
        beforeSend: function() {
            status.empty();
            var percentVal = '0%';
            bar.width(percentVal);
            percent.html(percentVal);
        },
        uploadProgress: function(event, position, total, percentComplete) {
            var percentVal = percentComplete + '%';
            percent.html(percentVal);
            bar.width(percentVal);
        },
        complete: function(xhr) {
            status.html(xhr.responseText);
        }
    });
});
});
</script>

这两个系统可以分别很好地工作,但是我不能混合使用它们,以便使用javascript验证表单并使用Ajax提交。

我认为我不太了解Ajax的工作原理,您能帮我吗?

我是初学者,请放纵。

解决方案: 我尝试了Chris G答案,并通过beforeSubmit更改了beforeSend函数,现在它可以正常工作了。

代码:

<form  method="POST" enctype="multipart/form-data" id="myForm" action="upload.php">

    <input type="file" name="imageSent" id="imgFile" class="inputImg" />
    <label for="imgFile" class="labelForImgF">
        <span>Select Img</span>
    </label>

    <button class="btnSubmit">
        <span>Send</span>
    </button>

</form>
<div id="bararea">
    <div id="bar"></div>
</div>

<div id="percent"></div>
<div id="status"></div>
    <script>
function verifyImg() {
    document.getElementById("warning").innerHTML = "";
    var fileName = document.getElementById("imgFile");
    if(fileName.files.item(0) == null) {
        document.getElementById("warning").innerHTML = "You must select an img";
        return false;
    } else {
        if(!isValidFileType(fileName.files.item(0).name,'image')) {
            document.getElementById("warning").innerHTML = "Bad format";
            return false;
        } else {
            return true;
            document.getElementById("warning").innerHTML = "Sucess";
        }
    }
}

var extensionLists = {}; 
extensionLists.image = ['jpg', 'nef', 'bmp', 'png', 'jpeg', 'svg', 'webp', '3fr', 'arw', 'crw', 'cr2', 'cr3', 'dng', 'kdc', 'mrw', 'nrw', 'orf', 'ptx', 'pef', 'raf', 'R3D', 'rw2', 'srw', 'x3f'];

function isValidFileType(fName, fType) {
return extensionLists[fType].indexOf(fName.toLowerCase().split('.').pop()) > -1;
}
</script>
<script>
$(document).ready(function(){
    var bar = $('#bar')
    var percent = $('#percent');
    var status = $('#status');

    $('form').ajaxForm({
        beforeSubmit: function() {
            if (!verifyImg()) return false ;
            status.empty();
            var percentVal = '0%';
            bar.width(percentVal);
            percent.html(percentVal);
        },
        uploadProgress: function(event, position, total, percentComplete) {
            var percentVal = percentComplete + '%';
            percent.html(percentVal);
            bar.width(percentVal);
        },
        complete: function(xhr) {
            status.html(xhr.responseText);
        }
    });
});
</script>

1 个答案:

答案 0 :(得分:1)

使用此代码,我已经检查了它,它运行良好。如果要测试上传进度,请在Google浏览器的控制台中选择network→然后在此处选择慢速3G: simulate slow network

否则,您将看不到上传进度的增加,除非您的照片尺寸很大,否则您会一眼看到100%的闪光。

用户无法通过在输入框accept中添加accept="image/*"属性来选择非图片文件,即使不使用此属性,JavaScript也会通过代码验证文件格式,您可以添加如果需要“(jpeg | png | bmp)”,请在此处输入其他类型:

    var file = $('input[name="photo"]').get(0).files[0];
    var matchArr = file.type.match(/image\/(jpeg|png|bmp)/);
    if (!matchArr) {
      alert("file type not allow!");
      return false;
    }

这是完整的代码:

$(document).ready(function() {
  $('input[type="button"]').on('click', function() {
    var file = $('input[name="photo"]').get(0).files[0];
    var matchArr = file.type.match(/image\/(jpeg|png|bmp)/);
    if (!matchArr) {
      alert("file type not allow!");
      return false;
    }

    var words = $('input[name="words"]').val();
    var formData = new FormData();
    formData.append('photo', file);
    formData.append('words', words);

    $.ajax({
      type: 'post',
      url: '',
      data: formData,
      //contentType must be false(otherwise it will use default value:application/x-www-form-urlencoded; charset=UTF-8, which is wrong)
      contentType: false,
      //tell jquery don't process data(otherwise it will throw an error:Uncaught TypeError: Illegal invocation)
      processData: false,
      xhr: function() {
        let xhr = new XMLHttpRequest();
        //listening upload progress
        xhr.upload.addEventListener('progress', function(e) {
          if (e.lengthComputable) {
            let progress = e.loaded / e.total;
            progress = Math.round(progress * 10000) / 100 + '%';
            $('.upload-progress').html(progress);
          }
        }, false);
        return xhr;
      },
      success: function(response) {
        console.log(response);
      }
    });
    return false;
  });
});
<html>

<head>
  <title>AjaxFormDataUpload</title>
  <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport" />
  <script src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
  <style>
    #upload-form {
      width: 50%;
      margin: 0 auto;
      border: 1px solid blue;
    }
    
    .field {
      padding: 10px;
    }
    
    .submit-btn {
      text-align: center;
      font-size: 20px;
    }
  </style>
</head>

<body>
  <form id="upload-form">
    <div class="field">
      <input type="file" name="photo" accept="image/*">
      <span class="upload-progress"></span>
    </div>
    <div class="field">
      <input type="text" name="words">
    </div>
    <div class="submit-btn">
      <input type="button" value="submit">
    </div>
  </form>
</body>

</html>