Home Web Front-end JS Tutorial Ajax image upload based on firefox

Ajax image upload based on firefox

May 25, 2018 am 11:29 AM
ajax firefox picture

This article mainly introduces the implementation of ajax image upload based on firefox. Everyone knows that using ajax under FF is very difficult. Today I will introduce to you a perfect solution to this problem. Friends can refer to it.

There are many protocols for uploading image files. This time we mainly talk about the form of "Content-Type: multipart/form-data;".

At work, some static files in the frontend are referenced through the FTL template system, and the frontend page is referenced through SSI. During project development, a large number of static SHTML files need to be generated. I originally thought it should be a backend thing, but Ever since I joined this company, this fast thing has been handed over to the front end~~ I was speechless, I had no choice but to follow my habits, but I am a lazy person, so I just thought about whether I could submit it through ajax

Based on my usual reading of MDN, today it is mainly the FormData object that solves the protocol for uploading multiple files.

https://developer.mozilla.org/en-US/docs/DOM/XMLHttpRequest/FormData

Everything seems to be perfect, but in the File method, only on the chrome level to run. There is no way to upload pictures. Generally, ordinary files can be implemented through Blob objects.

The following are some methods to achieve it, an exploration process

1. After looking for a long time, I found a method to convert URL to File object. , all failed. . .

2.HTML5 File direction

a. Let’s start with the example of HTML5 File

https://developer.mozilla.org/en-US/docs/DOM/ FileReader

In the example, when printing oFREvent.target.result, only "data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAUDBAQEAwUEBAQFBQ..."

is found. It turns out to be base64 encoded. Data

When I saw the encoded data above, I wondered if the Blob object was supported. The code is as follows

var fd = new FormData();
fd.append('my-file', new Blob(["data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAUDBAQEAwUEBAQFBQ..."],{type:"image/jpeg"}));
fd.append('my-file', new Blob(["data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAUDBAQEAwUEBAQFBQ..."],{type:"image/jpeg;base64"}));
Copy after login

b. I thought that base64 had been encoded. Is it possible to decode it through the method?

I found an example of base64 encoding and decoding on the Internet, and used it

fd.append('my-file', new Blob([new Base64().decode('/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAUDBAQEAwUEBAQFBQ...')],{type:"image/jpeg"}));
Copy after login

After capturing the packets, I found that the normal file transfer is different from the ajax data, so it must have failed

3. For the sake of security at the browser page level, it seems that the operation of selecting files must be done manually

https://developer.mozilla.org/en-US/docs/DOM/XMLHttpRequest/FormData/Using_FormData_Objects

fd.append('my-file',document.querySelector(Selector).files[0])
Copy after login

In fact, I was misled by the File api at the beginning. I always thought it was at the page level.

Suddenly I discovered that this method was used at the top of the last address. . It seems that I still didn’t look at things seriously and took some detours.

Postscript, by adding functions like the Oil Monkey plug-in and supporting the chrome-level File method, we can easily upload photos.

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

Related articles:

Ajax loading external page pop-up layer effect implementation method

AJAX submission form data example analysis

Ajax cross-domain (same basic domain name) form submission method

The above is the detailed content of Ajax image upload based on firefox. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

How to solve the problem of automatically saving pictures when publishing on Xiaohongshu? Where is the automatically saved image when posting? 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? 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 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 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 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 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 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 remove Firefox Snap in Ubuntu Linux? How to remove Firefox Snap in Ubuntu Linux? Feb 21, 2024 pm 07:00 PM

To remove FirefoxSnap in Ubuntu Linux, you can follow these steps: Open a terminal and log in to your Ubuntu system as administrator. Run the following command to uninstall FirefoxSnap: sudosnapremovefirefox You will be prompted for your administrator password. Enter your password and press Enter to confirm. Wait for command execution to complete. Once completed, FirefoxSnap will be completely removed. Note that this will remove versions of Firefox installed via the Snap package manager. If you installed another version of Firefox through other means (such as the APT package manager), you will not be affected. Go through the above steps

See all articles