How to realize second-hand transaction and idle item exchange in uniapp

Title: Specific code examples to implement second-hand transactions and idle item exchanges in UniApp

Introduction:
With the rise of second-hand transactions and idle item exchanges, more and more More and more people are looking for a convenient and fast trading platform. As a cross-platform development framework, UniApp provides a wealth of interfaces and components to facilitate developers to implement various functions. This article will introduce how to use the UniApp framework to realize the functions of second-hand trading and idle item exchange, and provide specific code examples.

1. Preparation work
Before proceeding with specific development, we need to prepare some necessary work:

1. Install the UniApp development environment: Please refer to the UniApp official documentation for installation.
2. Create project: Use the command line tool or graphical interface tool provided by UniApp to create a new UniApp project.

2. Implementation of second-hand transaction function

1. Create product list page
   In the uniapp project, we can create a product list page to display all second-hand product information . On this page, we can display the title, price, pictures and other information of the product, and provide filtering functions for users to quickly find the products they are interested in. The following is a simple sample code:

<template>
  <view class="container">
    <view class="search">
      <input class="search-input" type="text" placeholder="请输入关键字" />
      <button class="search-button">搜索</button>
    </view>
    <view class="goods-list">
      <!-- 循环展示商品列表 -->
      <view class="goods-item" v-for="(item, index) in goodsList" :key="index">
        <view class="goods-title">{{ item.title }}</view>
        <view class="goods-price">￥{{ item.price }}</view>
        <image class="goods-image" :src="item.imageUrl" mode="aspectFill"></image>
      </view>
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      goodsList: [
        {
          title: "二手手机",
          price: 1000,
          imageUrl: "https://example.com/phone.jpg"
        },
        // 其他商品信息...
      ]
    };
  }
};
</script>

<style>
.container {
  padding: 20rpx;
}
.search {
  display: flex;
  margin-bottom: 20rpx;
}
.search-input {
  flex: 1;
  border: 1px solid #ccc;
  border-radius: 5rpx;
  padding: 5rpx;
  font-size: 14px;
}
.search-button {
  margin-left: 10rpx;
  background-color: #333;
  color: #fff;
  border: none;
  border-radius: 5rpx;
  padding: 5rpx 10rpx;
  font-size: 14px;
}
.goods-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.goods-item {
  width: 45%;
  margin-bottom: 20rpx;
  border: 1px solid #ccc;
  border-radius: 5rpx;
  padding: 10rpx;
}
.goods-title {
  font-size: 16px;
  font-weight: bold;
}
.goods-price {
  color: #f00;
  margin-top: 5rpx;
}
.goods-image {
  width: 100%;
  height: 200rpx;
  margin-top: 10rpx;
}
</style>

2. Create product details page
   When the user clicks on a product, we can jump to the product details page to display the details of the product Information, including product description, seller information, contact information, etc. The following is a simple sample code:

<template>
  <view class="container">
    <view class="goods-info">
      <image class="goods-image" :src="goodsInfo.imageUrl" mode="aspectFit"></image>
      <view class="goods-title">{{ goodsInfo.title }}</view>
      <view class="goods-price">￥{{ goodsInfo.price }}</view>
      <view class="goods-desc">{{ goodsInfo.desc }}</view>
    </view>
    <view class="contact">
      <text class="contact-text">联系卖家：{{ goodsInfo.contact }}</text>
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      goodsInfo: {
        title: "二手手机",
        price: 1000,
        imageUrl: "https://example.com/phone.jpg",
        desc: "这是一部二手手机，配置X，性能优秀。",
        contact: "138********"
      }
    };
  }
};
</script>

<style>
.container {
  padding: 20rpx;
}
.goods-info {
  margin-bottom: 20rpx;
}
.goods-image {
  width: 100%;
  height: 300rpx;
  margin-bottom: 10rpx;
}
.goods-title {
  font-size: 20px;
  font-weight: bold;
  margin-bottom: 10rpx;
}
.goods-price {
  font-size: 16px;
  color: #f00;
  margin-bottom: 10rpx;
}
.goods-desc {
  font-size: 16px;
  line-height: 1.5;
  color: #666;
  margin-bottom: 10rpx;
}
.contact {
  display: flex;
  align-items: center;
}
.contact-text {
  font-size: 16px;
  margin-right: 10rpx;
}
</style>

In the above sample code, the product information is fixed, and the real product data can be obtained through the interface request.

3. Implementation of Idle Item Exchange Function
Idle item exchange is similar to second-hand trading. The difference is that users can publish their own idle item information and actively look for items of interest. In UniApp, we can achieve this function by creating pages for publishing items and browsing item lists.

1. Create a published item page
   Users can fill in the title, price, description, contact information and other information of the item on this page, and upload photos of the item. The following is a simple sample code:

<template>
  <view class="container">
    <form class="publish-form">
      <div class="form-group">
        <label class="label">标题：</label>
        <input class="input" type="text" placeholder="请输入标题" />
      </div>
      <div class="form-group">
        <label class="label">价格：</label>
        <input class="input" type="number" placeholder="请输入价格" />
      </div>
      <div class="form-group">
        <label class="label">描述：</label>
        <textarea class="textarea" placeholder="请输入物品描述"></textarea>
      </div>
      <div class="form-group">
        <label class="label">联系方式：</label>
        <input class="input" type="text" placeholder="请输入联系方式" />
      </div>
      <div class="form-group">
        <label class="label">照片：</label>
        <input class="input" type="file" accept="image/*" />
      </div>
      <button class="publish-button">发布</button>
    </form>
  </view>
</template>

<script>
export default {};
</script>

<style>
.container {
  padding: 20rpx;
}
.publish-form {
  display: grid;
  grid-template-columns: auto;
  grid-row-gap: 10rpx;
  max-width: 400rpx;
}
.form-group {
  display: flex;
  align-items: center;
}
.label {
  width: 100rpx;
}
.input,
.textarea {
  flex: 1;
  border: 1px solid #ccc;
  border-radius: 5rpx;
  padding: 5rpx;
  font-size: 14px;
}
.publish-button {
  margin-top: 10rpx;
  background-color: #333;
  color: #fff;
  border: none;
  border-radius: 5rpx;
  padding: 5rpx 10rpx;
  font-size: 14px;
}
</style>

2. Create a browse item list page
   Users can browse idle item information posted by other users on this page, and filter and contact them. The following is a simple sample code:

<template>
  <view class="container">
    <view class="search">
      <input class="search-input" type="text" placeholder="请输入关键字" />
      <button class="search-button">搜索</button>
    </view>
    <view class="goods-list">
      <!-- 循环展示物品列表 -->
      <view class="goods-item" v-for="(item, index) in goodsList" :key="index">
        <view class="goods-title">{{ item.title }}</view>
        <view class="goods-price">￥{{ item.price }}</view>
        <image class="goods-image" :src="item.imageUrl" mode="aspectFill"></image>
        <view class="goods-contact">{{ item.contact }}</view>
      </view>
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      goodsList: [
        {
          title: "闲置书籍",
          price: 50,
          imageUrl: "https://example.com/book.jpg",
          contact: "138********"
        },
        // 其他物品信息...
      ]
    };
  }
};
</script>

<style>
.container {
  padding: 20rpx;
}
.search {
  display: flex;
  margin-bottom: 20rpx;
}
.search-input {
  flex: 1;
  border: 1px solid #ccc;
  border-radius: 5rpx;
  padding: 5rpx;
  font-size: 14px;
}
.search-button {
  margin-left: 10rpx;
  background-color: #333;
  color: #fff;
  border: none;
  border-radius: 5rpx;
  padding: 5rpx 10rpx;
  font-size: 14px;
}
.goods-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.goods-item {
  width: 45%;
  margin-bottom: 20rpx;
  border: 1px solid #ccc;
  border-radius: 5rpx;
  padding: 10rpx;
}
.goods-title {
  font-size: 16px;
  font-weight: bold;
}
.goods-price {
  color: #f00;
  margin-top: 5rpx;
}
.goods-image {
  width: 100%;
  height: 200rpx;
  margin-top: 10rpx;
}
.goods-contact {
  font-size: 14px;
  margin-top: 5rpx;
  color: #666;
}
</style>

In the above sample code, the item information is also fixed, and the real item data can be obtained through the interface request.

Conclusion:
Through the UniApp framework, we can easily realize the functions of second-hand transactions and idle item exchange, providing users with a convenient platform for transactions. I hope the above examples will be helpful to you in developing second-hand trading and idle item exchange functions in UniApp. If you need more in-depth technical details, please refer to the UniApp official documentation or check out the relevant tutorials. I wish you success in UniApp development!

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