如何找到一個數組的索引並將該索引值用於另一個數組中的 select 值

Question

const COUNTY = ["DELHI","GUJARAT","GOA","ANDHRA"]

const COUNTY_CODE = ["001","002","003","004"]

我們有 2 個 arrays。第一個數組，我們在下拉列表中顯示。 我們需要根據第一個數組中選擇的縣從第二個數組傳遞縣代碼。

如何使用 angular JS 和 javascript 和 typescript 來做到這一點？

Answer 1

您可以使用indexOf function 來查找縣的索引，然后使用它來查找第二個數組中的代碼。

 const COUNTY = ["DELHI","GUJARAT","GOA","ANDHRA"] const COUNTY_CODE = ["001","002","003","004"] const selected = "DELHI"; const selectedIndex = COUNTY.indexOf(selected); const code = COUNTY_CODE[selectedIndex]; console.log(code);