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How to achieve multi-level linkage of data through PHP and UniApp
Introduction:
When developing web applications and mobile applications, we often encounter the need to achieve multi-level linkage, such as provinces and municipalities selection, product classification selection, etc. This article will introduce how to use PHP and UniApp to achieve multi-level linkage of data, and give corresponding code examples.
1. Data preparation
Before starting, we first need to prepare the data required for multi-level linkage. Suppose we want to implement a selector for three-level linkage of provinces and municipalities, we need to prepare a data table for provinces and municipalities.
Province table (provinces table):
id name
1 Province 1
2 Province 2
...
City table (cities table):
id province_id name
1 1 City 1
2 1 City 2
3 2 City 3
4 2 City 4
...
region table (areas table ):
id city_id name
1 1 area 1
2 1 area 2
3 2 area 3
4 2 area 4
...
II. PHP side implementation
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// Get province data
$provinces = $pdo->query('select * from provinces')->fetchAll(PDO::FETCH_ASSOC);
// Get the corresponding city data based on the province ID
if (isset($_GET['province_id'])) {
$provinceId = $_GET['province_id']; $cities = $pdo->query("select * from cities where province_id = $provinceId")->fetchAll(PDO::FETCH_ASSOC); echo json_encode($cities);
}
// Get the corresponding regional data based on the city ID
if (isset($_GET['city_id '])) {
$cityId = $_GET['city_id']; $areas = $pdo->query("select * from areas where city_id = $cityId")->fetchAll(PDO::FETCH_ASSOC); echo json_encode($areas);
}
?>
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<view class="container"> <picker mode="selector" range-key="name" range="{{provinces}}" bind:change="onChangeProvince"> <view class="picker"> {{province}} </view> </picker> <picker mode="selector" range-key="name" range="{{cities}}" bind:change="onChangeCity"> <view class="picker"> {{city}} </view> </picker> <picker mode="selector" range-key="name" range="{{areas}}"> <view class="picker"> {{area}} </view> </picker> </view>
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3f1c4e4b6b16bbbd69b2ee476dc4f83a
export default { data() { return { province: '', // 省份 city: '', // 城市 area: '', // 区域 provinces: [], // 省份数据 cities: [], // 城市数据 areas: [] // 区域数据 } }, mounted() { this.getProvinces() }, methods: { // 获取省份数据 getProvinces() { uni.request({ url: 'http://localhost/getData.php', success: (res) => { this.provinces = res.data } }) }, // 根据省份ID获取对应的城市数据 getCities(provinceId) { uni.request({ url: 'http://localhost/getData.php?province_id=' + provinceId, success: (res) => { this.cities = res.data } }) }, // 根据城市ID获取对应的区域数据 getAreas(cityId) { uni.request({ url: 'http://localhost/getData.php?city_id=' + cityId, success: (res) => { this.areas = res.data } }) }, // 省份选择器变化时的事件 onChangeProvince(event) { const index = event.detail.value this.province = this.provinces[index].name this.city = '' this.area = '' this.getCities(this.provinces[index].id) }, // 城市选择器变化时的事件 onChangeCity(event) { const index = event.detail.value this.city = this.cities[index].name this.area = '' this.getAreas(this.cities[index].id) } } }
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c9ccee2e6ea535a969eb3f532ad9fe89
.container { display: flex; flex-direction: column; align-items: center; justify-content: center; height: 100vh; } .picker { padding: 10px; border: 2px solid #ddd; border-radius: 4px; background-color: #f5f5f5; margin-bottom: 20px; }
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3. Summary
Through the above examples, we can see that using PHP and UniApp to achieve multi-level linkage of data It's not complicated. Through data processing on the PHP side and page writing on the UniApp side, a simple and practical multi-level linkage selector can be implemented with only a few lines of code. I hope this article can be helpful to you in realizing your needs for multi-level data linkage.
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