This tutorial continues the journey of building decentralized applications (DApps) on the Ethereum blockchain. Part 6 concluded the DAO's core functionality (voting, blacklisting, dividend distribution), and this final part focuses on creating a user interface for interaction.
Key Concepts:
- A straightforward HTML and JavaScript front-end connects to Ethereum smart contracts. Prioritizing core functionality over elaborate design.
- Truffle migrations automate token transfers during deployment, streamlining testing.
- Web3.js facilitates communication between the front-end and the Ethereum blockchain, requiring MetaMask for wallet management.
- Dynamically displays user status (logged in/out), token balance, and transaction history using Web3.js's asynchronous capabilities.
- Real-time event listening (token transfers, voting results) enhances the user experience.
- A user interface for proposal submission and voting promotes community participation.
- Thorough local testing is crucial before deploying to the main Ethereum network.
Automating Token Transfers:
The initial deployment leaves the token and DAO unconnected. To simplify testing, a migration script (4_configure_relationship.js) automates token transfer to the DAO:
var Migrations = artifacts.require("./Migrations.sol");
var StoryDao = artifacts.require("./StoryDao.sol");
var TNSToken = artifacts.require("./TNSToken.sol");
var storyInstance, tokenInstance;
module.exports = function (deployer, network, accounts) {
deployer.then(function () {
return TNSToken.deployed();
}).then(function (tIns) {
tokenInstance = tIns;
return StoryDao.deployed();
}).then(function (sIns) {
storyInstance = sIns;
return balance = tokenInstance.totalSupply();
}).then(function (bal) {
return tokenInstance.transfer(storyInstance.address, bal);
})
.then(function (something) {
return tokenInstance.transferOwnership(storyInstance.address);
});
}
This promise-based code sequentially deploys the token and DAO, then transfers the total token supply and ownership to the DAO's address. truffle migrate --reset executes this migration.
The Front-End (index.html):
A basic HTML structure with embedded JavaScript handles blockchain interaction:
<!DOCTYPE html>
<html lang="en">
<head>
<title>The Neverending Story</title>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<meta name="description" content="The Neverending Story is an community curated and moderated Ethereum dapp-story">
<link rel="stylesheet" href="assets/css/main.css"/>
</head>
<body>
<div class="grid-container">
<!-- ... (HTML structure for the DApp UI) ... -->
</div>
<🎜>
<🎜>
<🎜>
</body>
</html>
(Note: The full HTML and CSS are omitted for brevity. The provided snippets illustrate the key elements.)
JavaScript Interaction (app.js and main.js):
The JavaScript code leverages Web3.js to interact with the blockchain, assuming MetaMask is installed. It handles account information, event listening, and transaction submission. (Detailed JavaScript code is omitted for brevity but key concepts are explained below).
Account Information:
The DApp dynamically displays account information based on MetaMask login status. A user's avatar is generated using the Blockies library. The code fetches and displays token balances, submission counts, and whitelist/blacklist status. Asynchronous calls are used to handle blockchain interaction.
Event Listening:
The DApp listens for contract events (e.g., Whitelisted) using Web3.js's event listening capabilities. This allows for real-time updates in the UI. The code efficiently handles both historical events and newly emitted events, preventing duplicate display.
Submitting Entries:
The UI includes a form for submitting new entries to the story. The JavaScript code handles submission, converting text to hexadecimal format before sending the transaction to the blockchain. Gas limits are set to ensure successful transaction execution.
Conclusion and Further Development:
This section provides a foundation for a basic DApp front-end. Further development, such as integrating a full-fledged front-end framework (like Vue.js or React), enhancing the UI, and adding more sophisticated features, is encouraged. The tutorial concludes with a list of suggested improvements and FAQs covering various aspects of Ethereum DApp development. The next part will cover deployment to a live environment.
The above is the detailed content of Ethereum DApps: Building a Web3 UI for a DAO Contract. For more information, please follow other related articles on the PHP Chinese website!
Behind the first Android access to DeepSeek: Seeing the power of womenMar 12, 2025 pm 12:27 PMThe rise of Chinese women's tech power in the field of AI: The story behind Honor's collaboration with DeepSeek women's contribution to the field of technology is becoming increasingly significant. Data from the Ministry of Science and Technology of China shows that the number of female science and technology workers is huge and shows unique social value sensitivity in the development of AI algorithms. This article will focus on Honor mobile phones and explore the strength of the female team behind it being the first to connect to the DeepSeek big model, showing how they can promote technological progress and reshape the value coordinate system of technological development. On February 8, 2024, Honor officially launched the DeepSeek-R1 full-blood version big model, becoming the first manufacturer in the Android camp to connect to DeepSeek, arousing enthusiastic response from users. Behind this success, female team members are making product decisions, technical breakthroughs and users
DeepSeek's 'amazing' profit: the theoretical profit margin is as high as 545%!Mar 12, 2025 pm 12:21 PMDeepSeek released a technical article on Zhihu, introducing its DeepSeek-V3/R1 inference system in detail, and disclosed key financial data for the first time, which attracted industry attention. The article shows that the system's daily cost profit margin is as high as 545%, setting a new high in global AI big model profit. DeepSeek's low-cost strategy gives it an advantage in market competition. The cost of its model training is only 1%-5% of similar products, and the cost of V3 model training is only US$5.576 million, far lower than that of its competitors. Meanwhile, R1's API pricing is only 1/7 to 1/2 of OpenAIo3-mini. These data prove the commercial feasibility of the DeepSeek technology route and also establish the efficient profitability of AI models.
Top 10 Best Free Backlink Checker Tools in 2025Mar 21, 2025 am 08:28 AMWebsite construction is just the first step: the importance of SEO and backlinks Building a website is just the first step to converting it into a valuable marketing asset. You need to do SEO optimization to improve the visibility of your website in search engines and attract potential customers. Backlinks are the key to improving your website rankings, and it shows Google and other search engines the authority and credibility of your website. Not all backlinks are beneficial: Identify and avoid harmful links Not all backlinks are beneficial. Harmful links can harm your ranking. Excellent free backlink checking tool monitors the source of links to your website and reminds you of harmful links. In addition, you can also analyze your competitors’ link strategies and learn from them. Free backlink checking tool: Your SEO intelligence officer
Midea launches its first DeepSeek air conditioner: AI voice interaction can achieve 400,000 commands!Mar 12, 2025 pm 12:18 PMMidea will soon release its first air conditioner equipped with a DeepSeek big model - Midea fresh and clean air machine T6. The press conference is scheduled to be held at 1:30 pm on March 1. This air conditioner is equipped with an advanced air intelligent driving system, which can intelligently adjust parameters such as temperature, humidity and wind speed according to the environment. More importantly, it integrates the DeepSeek big model and supports more than 400,000 AI voice commands. Midea's move has caused heated discussions in the industry, and is particularly concerned about the significance of combining white goods and large models. Unlike the simple temperature settings of traditional air conditioners, Midea fresh and clean air machine T6 can understand more complex and vague instructions and intelligently adjust humidity according to the home environment, significantly improving the user experience.
Another national product from Baidu is connected to DeepSeek. Is it open or follow the trend?Mar 12, 2025 pm 01:48 PMDeepSeek-R1 empowers Baidu Library and Netdisk: The perfect integration of deep thinking and action has quickly integrated into many platforms in just one month. With its bold strategic layout, Baidu integrates DeepSeek as a third-party model partner and integrates it into its ecosystem, which marks a major progress in its "big model search" ecological strategy. Baidu Search and Wenxin Intelligent Intelligent Platform are the first to connect to the deep search functions of DeepSeek and Wenxin big models, providing users with a free AI search experience. At the same time, the classic slogan of "You will know when you go to Baidu", and the new version of Baidu APP also integrates the capabilities of Wenxin's big model and DeepSeek, launching "AI search" and "wide network information refinement"
Prompt Engineering for Web DevelopmentMar 09, 2025 am 08:27 AMAI Prompt Engineering for Code Generation: A Developer's Guide The landscape of code development is poised for a significant shift. Mastering Large Language Models (LLMs) and prompt engineering will be crucial for developers in the coming years. Th
Building a Network Vulnerability Scanner with GoApr 01, 2025 am 08:27 AMThis Go-based network vulnerability scanner efficiently identifies potential security weaknesses. It leverages Go's concurrency features for speed and includes service detection and vulnerability matching. Let's explore its capabilities and ethical
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
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Dreamweaver CS6
Visual web development tools
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
Dreamweaver Mac version
Visual web development tools
