[英]Javascript - Alert first item in object's arrays?
我收到一個錯誤的錯誤部分的API服務器響應,如下所示:
"errors": {
"username": [
"The username field is required."
],
"password": [
"The password field is required.",
"The password is too short."
]
}
要顯示單個錯誤,我可以這樣做: alert(results.body.errors.username);
手動。
我需要做的是在錯誤對象上映射(如果存在),並僅警告第一項錯誤。
因此,根據以上API響應,第一個警報應為The username field is required.
一旦用戶更正后,如果用戶尚未觸摸密碼字段並且他們重新提交,他們將收到另一個帶有錯誤的API響應,因此下一個警報錯誤應為The password field is required.
最后,一旦他們輸入了一個字符並重新提交,下一個警報應為The password is too short.
此后,由於沒有更多錯誤可顯示,因此沒有更多警報。
任何想法如何使它工作?
考慮到這是響應:
var response = {
"errors": {
"username": [
"The username field is required."
],
"password": [
"The password field is required.",
"The password is too short."
]
}
}
這將達到目的
alert(response.errors[Object.keys(response.errors)[0]][0])
在您的情況下,將results.body
替換為response
演示1: 必填用戶名字段。
var response = { "errors": { "username": [ "The username field is required." ], "password": [ "The password field is required.", "The password is too short." ] } } alert(response.errors[Object.keys(response.errors)[0]][0]);
Demo2: 密碼字段為必填。
var response = { "errors": { "password": [ "The password field is required.", "The password is too short." ] } } alert(response.errors[Object.keys(response.errors)[0]][0]);
Demo3: 密碼太短。
var response = { "errors": { "password": [ "The password is too short." ] } } alert(response.errors[Object.keys(response.errors)[0]][0]);
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