react native uses fetch to upload images
This time I will bring you how to use fetch to upload pictures in react native. What are the precautions for using fetch to upload pictures in react native? The following is a practical case, let’s take a look.
Normal networkRequest parameter is a JSON object
The request parameter for image upload uses the formData objectThe code for uploading images using fetch is encapsulated as follows:
let common_url = 'http://192.168.1.1:8080/'; //服务器地址
let token = ''; //用户登陆后返回的token
/**
* 使用fetch实现图片上传
* @param {string} url 接口地址
* @param {JSON} params body的请求参数
* @return 返回Promise
*/
function uploadImage(url,params){
return new Promise(function (resolve, reject) {
let formData = new FormData();
for (var key in params){
formData.append(key, params[key]);
}
let file = {uri: params.path, type: 'application/octet-stream', name: 'image.jpg'};
formData.append("file", file);
fetch(common_url + url, {
method: 'POST',
headers: {
'Content-Type': 'multipart/form-data;charset=utf-8',
"x-access-token": token,
},
body: formData,
}).then((response) => response.json())
.then((responseData)=> {
console.log('uploadImage', responseData);
resolve(responseData);
})
.catch((err)=> {
console.log('err', err);
reject(err);
});
});
}Usage method
let params = {
userId:'abc12345', //用户id
path:'file:///storage/emulated/0/Pictures/image.jpg' //本地文件地址
}
uploadImage('app/uploadFile',params )
.then( res=>{
//请求成功
if(res.header.statusCode == 'success'){
//这里设定服务器返回的header中statusCode为success时数据返回成功
upLoadImgUrl = res.body.imgurl; //服务器返回的地址
}else{
//服务器返回异常，设定服务器返回的异常信息保存在 header.msgArray[0].desc
console.log(res.header.msgArray[0].desc);
}
}).catch( err=>{
//请求失败
})let file = {uri : params.path, type: 'application/octet-stream', name: 'image.jpg'} may also be the type in multipart/form-data
formData.append("file", file) The file field may also be images
Several ways to bind this to react events
How to use characters in String.prototype.format String concatenation
Detailed explanation of implicit type conversion in JS
How to use $http service in angular
The above is the detailed content of react native uses fetch to upload images. 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
1655
14
1414
52
1307
25
1255
29
1228
24
How to build a reliable messaging app with React and RabbitMQ
Sep 28, 2023 pm 08:24 PM
How to build a reliable messaging application with React and RabbitMQ Introduction: Modern applications need to support reliable messaging to achieve features such as real-time updates and data synchronization. React is a popular JavaScript library for building user interfaces, while RabbitMQ is a reliable messaging middleware. This article will introduce how to combine React and RabbitMQ to build a reliable messaging application, and provide specific code examples. RabbitMQ overview:
React Router User Guide: How to implement front-end routing control
Sep 29, 2023 pm 05:45 PM
ReactRouter User Guide: How to Implement Front-End Routing Control With the popularity of single-page applications, front-end routing has become an important part that cannot be ignored. As the most popular routing library in the React ecosystem, ReactRouter provides rich functions and easy-to-use APIs, making the implementation of front-end routing very simple and flexible. This article will introduce how to use ReactRouter and provide some specific code examples. To install ReactRouter first, we need
PHP, Vue and React: How to choose the most suitable front-end framework?
Mar 15, 2024 pm 05:48 PM
PHP, Vue and React: How to choose the most suitable front-end framework? With the continuous development of Internet technology, front-end frameworks play a vital role in Web development. PHP, Vue and React are three representative front-end frameworks, each with its own unique characteristics and advantages. When choosing which front-end framework to use, developers need to make an informed decision based on project needs, team skills, and personal preferences. This article will compare the characteristics and uses of the three front-end frameworks PHP, Vue and React.
How to use React to develop a responsive backend management system
Sep 28, 2023 pm 04:55 PM
How to use React to develop a responsive backend management system. With the rapid development of the Internet, more and more companies and organizations need an efficient, flexible, and easy-to-manage backend management system to handle daily operations. As one of the most popular JavaScript libraries currently, React provides a concise, efficient and maintainable way to build user interfaces. This article will introduce how to use React to develop a responsive backend management system and give specific code examples. Create a React project first
Integration of Java framework and front-end React framework
Jun 01, 2024 pm 03:16 PM
Integration of Java framework and React framework: Steps: Set up the back-end Java framework. Create project structure. Configure build tools. Create React applications. Write REST API endpoints. Configure the communication mechanism. Practical case (SpringBoot+React): Java code: Define RESTfulAPI controller. React code: Get and display the data returned by the API.
Vue.js vs. React: Project-Specific Considerations
Apr 09, 2025 am 12:01 AM
Vue.js is suitable for small and medium-sized projects and fast iterations, while React is suitable for large and complex applications. 1) Vue.js is easy to use and is suitable for situations where the team is insufficient or the project scale is small. 2) React has a richer ecosystem and is suitable for projects with high performance and complex functional needs.
What closures does react have?
Oct 27, 2023 pm 03:11 PM
React has closures such as event handling functions, useEffect and useCallback, higher-order components, etc. Detailed introduction: 1. Event handling function closure: In React, when we define an event handling function in a component, the function will form a closure and can access the status and properties within the component scope. In this way, the state and properties of the component can be used in the event processing function to implement interactive logic; 2. Closures in useEffect and useCallback, etc.
React's Role in HTML: Enhancing User Experience
Apr 09, 2025 am 12:11 AM
React combines JSX and HTML to improve user experience. 1) JSX embeds HTML to make development more intuitive. 2) The virtual DOM mechanism optimizes performance and reduces DOM operations. 3) Component-based management UI to improve maintainability. 4) State management and event processing enhance interactivity.
