使用Javascript提交表单并使用ajaxForm处理它

问题描述 投票：0回答：1

我正在更改我的系统，以便在我现在提交表单时有一个加载进度条。

在我的旧系统中，我有这个表单和这个脚本来检查文件是否存在并且格式正确：

的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，它适用于ajax但我无法检查格式是否正确，因为只要我将onclick:verifyImg();放在我的按钮中，表单提交而不通过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>

这两个系统分别运行良好，但我不能混用它们，以便用javascript验证我的表单并用Ajax提交它。

我想我不太了解Ajax是如何工作的，你能帮助我吗？

我是初学者请放纵。

解决方案：我尝试了Chris G的回答并在发送之前更改了函数，然后现在它完美地工作了。

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>
javascript jquery html ajax forms
1个回答
1
投票

使用此代码，我检查它，它运行良好。如果你想测试上传进度，请在谷歌浏览器的控制台中选择network→然后在这里选择慢速3G：simulate slow network

否则，您无法看到上传进度增加，除非您的照片尺寸非常大，否则您将看到100％的闪光灯。

用户无法通过将accept属性添加到输入框accept="image/*"来选择非图像文件，即使不使用此属性，javascript也会通过代码验证文件格式，如果需要，可以在此处添加其他类型“（jpeg | png | BMP）“：

    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>
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