停止javascript以在alert()函数之后重定向
我正在使用javascript检查文件大小。如果它大于1m,则显示警报,然后重定向到索引页 我想知道如何使它在没有重定向和刷新的情况下保持在同一页面上,并保持用户插入的所有页面信息不变 代码如下:停止javascript以在alert()函数之后重定向,javascript,alert,Javascript,Alert,我正在使用javascript检查文件大小。如果它大于1m,则显示警报,然后重定向到索引页 我想知道如何使它在没有重定向和刷新的情况下保持在同一页面上,并保持用户插入的所有页面信息不变 代码如下: if(fileInput.files[0].size > 1050000) { alert('File size is bigger than 1Mb!'); return false; } 孔代号: var handleUpload = function(event){
if(fileInput.files[0].size > 1050000) {
alert('File size is bigger than 1Mb!');
return false;
}
孔代号:
var handleUpload = function(event){
event.preventDefault();
event.stopPropagation();
var fileInput = document.getElementById('file');
var data = new FormData();
data.append('javascript', true);
if(fileInput.files[0].size > 1050000) {
//document.getElementById("image_id").innerHTML = "Image too big (max 1Mb)";
alert('File bigger than 1Mb!');
//window.location="upload.php";
return false;
}
for (var i = 0; i < fileInput.files.length; ++i){
data.append('file[]', fileInput.files[i]);
}
var request = new XMLHttpRequest();
request.upload.addEventListener('progress', function(event){
if(event.lengthComputable){
var percent = event.loaded / event.total;
var progress = document.getElementById('upload_progress');
while (progress.hasChildNodes()){
progress.removeChild(progress.firstChild);
}
progress.appendChild(document.createTextNode(Math.round(percent * 100) +' %'));
document.getElementById("loading-progress-17").style.width= Math.round(percent * 100) +'%';
}
});
request.upload.addEventListener('load', function(event){
document.getElementById('upload_progress').style.display = 'none';
});
request.upload.addEventListener('error', function(event){
alert('Upload failed');
});
request.addEventListener('readystatechange', function(event){
if (this.readyState == 4){
if(this.status == 200){
var links = document.getElementById('uploaded');
var uploaded = eval(this.response);
var div, a;
for (var i = 0; i < uploaded.length; ++i){
div = document.createElement('div');
a = document.createElement('a');
a.setAttribute('href', 'files/' + uploaded[i]);
a.appendChild(document.createTextNode(uploaded[i]));
div.appendChild(a);
links.appendChild(div);
}
}else{
console.log('server replied with HTTP status ' + this.status);
}
}
});
request.open('POST', 'upload.php');
request.setRequestHeader('Cache-Control', 'no-cache');
document.getElementById('upload_progress').style.display = 'block';
request.send(data);
}
window.addEventListener('load', function(event){
var submit = document.getElementById('submit');
submit.addEventListener('click', handleUpload);
});
var handleUpload=函数(事件){
event.preventDefault();
event.stopPropagation();
var fileInput=document.getElementById('file');
var data=new FormData();
data.append('javascript',true);
如果(fileInput.files[0].size>1050000){
//document.getElementById(“image_id”).innerHTML=“图像太大(最大1Mb)”;
警报('文件大于1Mb!');
//window.location=“upload.php”;
返回false;
}
对于(变量i=0;i
带有html的upload.php代码
<?php
foreach($_FILES['file']['name'] as $key => $name){
if ($_FILES['file']['error'][$key] == 0 && move_uploaded_file($_FILES['file']['tmp_name'][$key], "files/{$name}")){
$uploaded[] = $name;
}
}
if(!empty($_POST['javascript'])){
die(json_encode($uploaded));
}
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="upload.js"></script>
</head>
<body>
<div id="uploaded">
<?php
if (!empty($uploaded)){
foreach ($uploaded as $name){
echo '<div><a href="files/',$name,'">',$name,'</a></div>';
}
}
?>
</div>
<div id="upload_progress"></div>
<div>
<form action="" method="post" enctype="multipart/form-data">
<input type="file" id="file" name="file[]" />
<input type="submit" id="submit" value="upload" />
</form>
提前感谢您可以摆脱
返回
它应该可以工作。否则,也许你应该尝试模态而不是警报。它们更加整洁漂亮返回false会阻止重定向
var val = $("#inputId").val();
if (val >= 0 || val <=9)
{
return true;
}
else
{
alert("Enter Digits Only");
return false;
}
```
var val=$(“#inputId”).val();
如果(val>=0 | | val在警报函数下方添加event.preventDefault();
。
这可能会帮助您保持在同一页面上。显示执行重定向的代码。在警报框中按“确定”后,它会将我重定向到索引page@Barmar需要页面代码吗?如果我们一开始不知道它是如何重定向的,那么很难告诉我们如何阻止它重定向。请尝试将其减少到理解所需的最小值发生了什么。PHP代码与此无关,因为当大小检查失败时,您不会进行上载。重要的是调用handleupload()
的代码,它必须执行重定向。在这种情况下,请尝试modals。