我目前正在更改我的系统,以便在提交表单时有一个加载进度栏。
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:
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,它可以很好地与ajax配合使用,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时不经过 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>
这两个系统单独工作得很好,但我不能混合使用它们,以便使用 javascript 验证我的表单并使用 Ajax 提交它。
我想我不太了解 Ajax 的工作原理,你能帮助我吗?
本人是初学者,请多多包涵。
解决方案: 我尝试了 Chris G 的回答,并通过 beforeSubmit 更改了 beforeSend 函数,现在它工作得很好。
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>
最佳答案
使用这个代码,我已经检查过,它运行良好。如果你想测试上传进度,在谷歌浏览器的控制台中,选择网络
→然后在此处选择慢速3G:
否则,你看不到上传进度的增加,除非你的照片尺寸非常大,否则你会很快看到100%。
用户无法通过在输入框添加accept
属性accept="image/*"
来选择非图像文件,即使不使用该属性,javascript将通过那里的代码验证文件格式,如果您需要“(jpeg|png|bmp)”,您可以在此处添加其他类型:
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>
关于javascript - 使用 Javascript 提交表单并使用 ajaxForm 处理,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54379553/