uniapp gets the requested parameters

When developing mobile applications, we inevitably need to request data from the server. In this process, it is very important to obtain the parameters of the request. This is a very common requirement for developers using uniapp for mobile application development. The following will introduce how uniapp obtains the requested parameters.

Request parameters refer to the data we need to pass to the server, usually including query conditions, page numbers, number of pages per page, etc. In order to facilitate unified management of these parameters, we usually encapsulate them into an object, and then pass this object to the server when calling the interface. In uniapp, we can use the following method to get the parameters of the request.

1. Using JavaScript’s URLSearchParams object

URLSearchParams is a built-in object used to parse the query string of a URL. We can use this object to get request parameters. The following is a sample code using URLSearchParams:

let params = new URLSearchParams(window.location.search)
let id = params.get('id')
console.log(id)

In this code, we first create a URLSearchParams object and pass the query string (window.location.search) to it. Then, we call the params.get('id') method to get the value of the query parameter named "id".

2. Use the getCurrentPages() method of uni-app

uni-app provides a getCurrentPages() method that can obtain all pages in the current page stack. We can use this method to get the parameters of the current page. The following is a sample code using the getCurrentPages() method:

let currentPages = getCurrentPages()
let currentPage = currentPages[currentPages.length - 1]
let options = currentPage.options
console.log(options.id)

In this code, we first call the getCurrentPages() method to obtain the current page and other pages in the page stack. Then, we use the array index (currentPages.length - 1) to get the current page, and get the parameters of the current page through currentPage.options. Finally, we print the value of the query parameter named "id".

3. Use the onLoad() method of uni-app

In the page life cycle hook function (onLoad, onReady, etc.) of uni-app, you can receive the formal parameter options, which contains Parameters of the current page. We can use the onLoad() method to get the parameters. The following is a sample code using the onLoad() method:

export default {
  onLoad(options) {
    console.log(options.id)
  }
}

In this code, we define an onLoad() event. When the page is loaded, the method will be automatically called and an options is passed. object. We can get the value of the query parameter named "id" directly from options.

Summary

The above three methods can obtain request parameters in uniapp. Parameters can be obtained outside the page using the URLSearchParams object, parameters can be obtained on the current page in the getCurrentPages() method, and parameters can also be obtained on the current page in the onLoad() method. Depending on the specific needs, we can choose different methods based on priorities.

In short, for developers who develop mobile applications, obtaining request parameters is a very common need. The above method can help us solve this problem well.

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