[英]Javascript - Alert first item in object's arrays?
我收到一个错误的错误部分的API服务器响应,如下所示:
"errors": {
"username": [
"The username field is required."
],
"password": [
"The password field is required.",
"The password is too short."
]
}
要显示单个错误,我可以这样做: alert(results.body.errors.username);
手动。
我需要做的是在错误对象上映射(如果存在),并仅警告第一项错误。
因此,根据以上API响应,第一个警报应为The username field is required.
一旦用户更正后,如果用户尚未触摸密码字段并且他们重新提交,他们将收到另一个带有错误的API响应,因此下一个警报错误应为The password field is required.
最后,一旦他们输入了一个字符并重新提交,下一个警报应为The password is too short.
此后,由于没有更多错误可显示,因此没有更多警报。
任何想法如何使它工作?
考虑到这是响应:
var response = {
"errors": {
"username": [
"The username field is required."
],
"password": [
"The password field is required.",
"The password is too short."
]
}
}
这将达到目的
alert(response.errors[Object.keys(response.errors)[0]][0])
在您的情况下,将results.body
替换为response
演示1: 必填用户名字段。
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: 密码字段为必填。
var response = { "errors": { "password": [ "The password field is required.", "The password is too short." ] } } alert(response.errors[Object.keys(response.errors)[0]][0]);
Demo3: 密码太短。
var response = { "errors": { "password": [ "The password is too short." ] } } alert(response.errors[Object.keys(response.errors)[0]][0]);
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