Passing parameters on different pages of uniapp

With the popularity of mobile Internet, the development of mobile applications has attracted more and more attention. As one of the most popular cross-platform development frameworks, Uniapp is widely used in the development of mobile applications. In the development of Uniapp, how to transfer parameters between different pages is a very common problem. This article will introduce how to transfer parameters between different pages in Uniapp from several aspects.

1. Query parameters passing

In Uniapp, parameters can be passed through the query parameters of the page. For example, we can jump to the details page by clicking the button on the home page, and pass the product ID to the details page. The code is implemented as follows:

// Jump code on the home page
uni.navigateTo( {
url: '/pages/detail/detail?id=' this.goodsId
});

// Obtain code in the details page
onLoad(options) {
this.goodsId = options.id;
}

In the home page, we jump to the details page through the uni.navigateTo method, and pass the product id to the details page through the query parameter. In the details page, we obtain the passed product ID through the options parameter in the onLoad method, and assign it to the variable goodsId corresponding to the details page.

2. Vuex parameter transfer

In Uniapp, you can use Vuex to transfer parameters between different pages. Vuex is a state management library specially designed for the Vue.js framework, which can realize state sharing between different components. In Uniapp, you can define a global variable in Vuex and introduce Vuex into the pages that need to pass parameters, thereby realizing parameter transfer between pages.

For example, we can define a global variable goodsId in the Vuex state, change the value of the variable on the home page, and obtain the value of the variable on the details page. The code is implemented as follows:

// Define the global variable goodsId
state in Vuex's state: {
goodsId: ''
}

// Change the value of this variable in the homepage
methods: {
jumpToDetail() {

this.$store.state.goodsId = '123456';
uni.navigateTo({
  url: '/pages/detail/detail'
});

}
}

// Get the value of this variable in the details page
computed: {
goodsId() {

return this.$store.state.goodsId;

}
}

In the home page, we assign a value to the global variable goodsId through this.$store.state.goodsId, and jump to the details page through the uni.navigateTo method. In the details page, we obtain the goodsId variable in Vuex through the computed attribute to obtain the passed value.

3. Event bus parameter transfer

In Uniapp, we can also use the event bus to transfer parameters between different pages. Event bus is a design pattern that allows different components to communicate and pass parameters by listening to events and triggering events. In Uniapp, you can use the uni.$emit and uni.$on methods to monitor and trigger events.

For example, we can trigger an event through the uni.$emit method on the homepage, and listen to the event through the uni.$on method on the details page, thereby realizing the transfer of parameters. The code is implemented as follows:

// Use uni.$emit to trigger events on the homepage
methods: {
jumpToDetail() {

uni.$emit('goodsId', '123456');
uni.navigateTo({
  url: '/pages/detail/detail'
});

}
}

// On the details page Use uni.$on to listen for events
onLoad() {
uni.$on('goodsId', (goodsId) => {

this.goodsId = goodsId;

});
}

In the home page, we trigger the event named 'goodsId' through the uni.$emit method and pass the product id '123456' as a parameter. In the details page, we listen to the event named 'goodsId' through the uni.$on method in the onLoad method, and assign the passed product id to the variable goodsId corresponding to the details page.

To sum up, parameter transfer between different pages in Uniapp can be achieved through query parameter transfer, Vuex parameter transfer and event bus parameter transfer. Developers can choose the appropriate method to pass parameters based on actual needs to better realize the functional requirements of the application.

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