Asynchronous file or image upload ajax
This time I will bring you asynchronous file or picture upload ajax, what are the precautions for asynchronous file or picture upload ajax, the following is a practical case, let's take a look.
As we all know, most major websites now have a In fact, there are two ways to upload files, one is from form submit submission, and the other is asynchronous submission through ajax. However, a problem with form form submission is that the interface will be refreshed every time the upload is completed, which cannot be implemented. Asynchronous upload, so now almost all websites use ajax asynchronous upload. Now I will show you how to implement ajax asynchronous upload. First I create a form form, the code is as follows:<form action="" id="form"> 用户名：<input type="text" name="user"/></br> 密码：<input type="password" name="pass" /></br> 性别：<input type="radio" name="sex" value="男"/>男 <input type="radio" name="sex" value="女"/>女 头像：<input type="file" id="file" name="file"/></br> <button id="btn" type="button">提交</button> </form> <p class="con"></p>
var imgs=[];//存储图片链接
//为文件上传添加change事件
var fileM=document.querySelector("#file");
$("#file").on("change",function(){
console.log(fileM.files);
//获取文件对象，files是文件选取控件的属性，存储的是文件选取控件选取的文件对象，类型是一个数组
var fileObj=fileM.files[0];
//创建formdata对象，formData用来存储表单的数据，表单数据时以键值对形式存储的。
var formData=new FormData();
formData.append('file',fileObj); //创建ajax对象
var ajax=new XMLHttpRequest();
//发送POST请求
ajax.open("POST","http://localhost/phpClass/file-upload/move_file.php",true);
ajax.send(formData);
ajax.onreadystatechange=function(){
if (ajax.readyState == 4) {
if (ajax.status>=200 &&ajax.status<300||ajax.status==304) {
console.log(ajax.responseText);
var obj=JSON.parse(ajax.responseText);
alert(obj.msg);
if(obj.err == 0){、
//上传成功后自动动创建img标签放在指定位置
var img =$("<img src='"+obj.msg+"' alt='' />");
$(".con").append(img);
imgs.push(obj.msg);
}else{
alert(obj.msg);
}
}
}
}
});<?php
//解决跨域问题
header("Access-Control-Allow-Origin:*");
//说明向前台返回的数据类型为JSON
header("Content-type:text/json");
//$_FILES超全局变量存储是文件数据，是一个关联数组
$fileObj=$_FILES['file'];
var_dump($fileObj);
if($fileObj["error"]==0){
//判断文件是否合法
$types=["jpg","jpeg","png","gif"];
$type = explode("/", $fileObj["type"])[1];
if(in_array($type, $types)){
$time = time();//获取时间戳 返回一个整形
//获取文件详细路径
$filePath="http://localhost/phpClass/image1".$time.".".$type;
echo $filePath;
//移动文件
$res=move_uploaded_file($fileObj["tmp_name"],"../image1/".$time.".".$type);
if($res){
$infor=array("err"=>0,"msg"=>"文件移动成功");
}else{
$infor=array("err"=>1,"msg"=>"文件移动失败");
}
}else{
$infor=array("err"=>1,"msg"=>"文件格式不合法");
}
echo json_encode($infor);
}
?>//完成form表单数据的提交
$('#btn').on('click',function(){
// serializeArray()将form表单控件中的数据序列化成数组,数组中含有若干对象,对象包含对应控件的name和value
var infor = $('#form').serializeArray();
// console.log(infor);
var stu = {};
for (var i=0;i<infor.length;i++) {
var obj=infor[i];
stu[obj.name] = obj.value;
}
stu["imgs"] = imgs;
stu["imgs"] = imgs[0];
//发送ajax请求
$.ajax({
url:"http://localhost/phpClass/file-upload/data.php",
data:{
parameter :JSON.stringify(stu)
},
success:function(res){
console.log(res.msg);
}
});
});Why garbled characters appear when ajax passes json
Summary of Ajax that novices must learn
The above is the detailed content of Asynchronous file or image upload ajax. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
How to solve the problem of automatically saving pictures when publishing on Xiaohongshu? Where is the automatically saved image when posting?
Mar 22, 2024 am 08:06 AM
With the continuous development of social media, Xiaohongshu has become a platform for more and more young people to share their lives and discover beautiful things. Many users are troubled by auto-save issues when posting images. So, how to solve this problem? 1. How to solve the problem of automatically saving pictures when publishing on Xiaohongshu? 1. Clear the cache First, we can try to clear the cache data of Xiaohongshu. The steps are as follows: (1) Open Xiaohongshu and click the "My" button in the lower right corner; (2) On the personal center page, find "Settings" and click it; (3) Scroll down and find the "Clear Cache" option. Click OK. After clearing the cache, re-enter Xiaohongshu and try to post pictures to see if the automatic saving problem is solved. 2. Update the Xiaohongshu version to ensure that your Xiaohongshu
How to post pictures in TikTok comments? Where is the entrance to the pictures in the comment area?
Mar 21, 2024 pm 09:12 PM
With the popularity of Douyin short videos, user interactions in the comment area have become more colorful. Some users wish to share images in comments to better express their opinions or emotions. So, how to post pictures in TikTok comments? This article will answer this question in detail and provide you with some related tips and precautions. 1. How to post pictures in Douyin comments? 1. Open Douyin: First, you need to open Douyin APP and log in to your account. 2. Find the comment area: When browsing or posting a short video, find the place where you want to comment and click the "Comment" button. 3. Enter your comment content: Enter your comment content in the comment area. 4. Choose to send a picture: In the interface for entering comment content, you will see a "picture" button or a "+" button, click
6 Ways to Make Pictures Sharper on iPhone
Mar 04, 2024 pm 06:25 PM
Apple's recent iPhones capture memories with crisp detail, saturation and brightness. But sometimes, you may encounter some issues that may cause the image to look less clear. While autofocus on iPhone cameras has come a long way, allowing you to take photos quickly, the camera can mistakenly focus on the wrong subject in certain situations, making the photo blurry in unwanted areas. If your photos on your iPhone look out of focus or lack sharpness overall, the following post should help you make them sharper. How to Make Pictures Clearer on iPhone [6 Methods] You can try using the native Photos app to clean up your photos. If you want more features and options
How to make ppt pictures appear one by one
Mar 25, 2024 pm 04:00 PM
In PowerPoint, it is a common technique to display pictures one by one, which can be achieved by setting animation effects. This guide details the steps to implement this technique, including basic setup, image insertion, adding animation, and adjusting animation order and timing. Additionally, advanced settings and adjustments are provided, such as using triggers, adjusting animation speed and order, and previewing animation effects. By following these steps and tips, users can easily set up pictures to appear one after another in PowerPoint, thereby enhancing the visual impact of the presentation and grabbing the attention of the audience.
What should I do if the images on the webpage cannot be loaded? 6 solutions
Mar 15, 2024 am 10:30 AM
Some netizens found that when they opened the browser web page, the pictures on the web page could not be loaded for a long time. What happened? I checked that the network is normal, so where is the problem? The editor below will introduce to you six solutions to the problem that web page images cannot be loaded. Web page images cannot be loaded: 1. Internet speed problem The web page cannot display images. It may be because the computer's Internet speed is relatively slow and there are more softwares opened on the computer. And the images we access are relatively large, which may be due to loading timeout. As a result, the picture cannot be displayed. You can turn off the software that consumes more network speed. You can go to the task manager to check. 2. Too many visitors. If the webpage cannot display pictures, it may be because the webpages we visited were visited at the same time.
How to convert pdf documents into jpg images with Foxit PDF Reader - How to convert pdf documents into jpg images with Foxit PDF Reader
Mar 04, 2024 pm 05:49 PM
Are you also using Foxit PDF Reader software? So do you know how Foxit PDF Reader converts pdf documents into jpg images? The following article brings you how Foxit PDF Reader converts pdf documents into jpg images. For those who are interested in the method of converting jpg images, please come and take a look below. First start Foxit PDF Reader, then find "Features" on the top toolbar, and then select the "PDF to Others" function. Next, open a web page called "Foxit PDF Online Conversion". Click the "Login" button on the upper right side of the page to log in, and then turn on the "PDF to Image" function. Then click the upload button and add the pdf file you want to convert into an image. After adding it, click "Start Conversion"
How to arrange two pictures side by side in wps document
Mar 20, 2024 pm 04:00 PM
When using WPS office software, we found that not only one form is used, tables and pictures can be added to the text, pictures can also be added to the table, etc. These are all used together to make the content of the entire document look richer. , if you need to insert two pictures into the document and they need to be arranged side by side. Our next course can solve this problem: how to place two pictures side by side in a wps document. 1. First, you need to open the WPS software and find the picture you want to adjust. Left-click the picture and a menu bar will pop up, select "Page Layout". 2. Select "Tight wrapping" in text wrapping. 3. After all the pictures you need are confirmed to be set to "Tight text wrapping", you can drag the pictures to the appropriate position and click on the first picture.
How to upload lyrics to QQ Music
Feb 23, 2024 pm 11:45 PM
With the advent of the digital age, music platforms have become one of the main ways for people to obtain music. However, sometimes when we listen to songs, we find that there are no lyrics, which is very disturbing. Many people hope that lyrics can be displayed when listening to songs to better understand the content and emotions of the songs. QQ Music, as one of the largest music platforms in China, also provides users with the function of uploading lyrics, so that users can better enjoy music and feel the connotation of the songs. The following will introduce how to upload lyrics on QQ Music. first
