如何检查另一个存在的JSON对象 [英] How to check for one JSON object being present in another
问题描述
我在 JSON （data.json）中有两组数据，如下所示：
UP = [{password：jhonjhon，username：jhon}，{password：juliejulie，username：julie}，{password：blakeblake用户名 ： 布莱克}];
和
Admins ='[{Admin：jhon}，{Admin：julie}]';
我有一个 HTML 表单，用户将使用它登录。
< html>
< body>
UserName< input type =textid =uidvalue =UserId/>
UserPassword< input type =passwordid =pwdvalue =UserPwd/>
< input type =submit/>
< / form>
< / body>
< script src =data.json>< / script>
< script src =checking.js>< / script>
< / html>
点击提交按钮，我想先检查用户名（存储在var，例如 x ）是否属于 JSON 文件中的 Admins 列表。例如：如果 x 是 jhon 我想知道相同的 jhon 存在于 JSON 的 Admins 中。
截至目前的JavaScript
如下： function finalcheck（）{
var x = document.forms [myForm] [uid] .value;
var y = document.forms [myForm] [pwd] .value;
}
非常感谢JavaScript的帮助！
<您应该循环遍历JSON对象并检查
uid 是否存在。如果 x 是 $ b
adminFlag 出现在 Admins 。 尝试下面给出的代码：
function finalCheck（）{
var adminJSON = JSON.parse（Admins），//因为Admins是字符串，所以先解析为Json
length = adminJSON。长度，
x = document.forms [myForm] [uid]。value，
y = document.forms [myForm] [pwd]。value，
adminFlag =假;
// for for循环找到admin是否存在
for（var i = 0; i< length; i ++）{
if（adminJSON [i] .Admin == x）{
adminFlag = true;
休息;
}
}
}
I have two sets of data in a JSON (data.json) as below :
UP = [{"password": "jhonjhon", "username":"jhon"}, {"password": "juliejulie", "username":"julie"}, {"password": "blakeblake", "username":"blake"}];
And
Admins = '[{"Admin":"jhon"}, {"Admin":"julie"}]';
I have an HTML form which the user will use to login.
<html>
<body>
<form name="myForm" onsubmit="finalCheck()">
UserName<input type="text" id="uid" value="UserId"/>
UserPassword<input type="password" id="pwd" value="UserPwd"/>
<input type="submit"/>
</form>
</body>
<script src="data.json"></script>
<script src="checking.js"></script>
</html>
On the click of the submit button I want to first check if the username (stored in a var, say x) entered belongs to the Admins list in my JSON file or not. Eg: if x is jhon I want to know if the same jhon exists in the Admins of the JSON.
JavaScript as of now is as :
function finalcheck(){
var x = document.forms["myForm"]["uid"].value;
var y = document.forms["myForm"]["pwd"].value;
}
Help with JavaScript is much appreciated!
Your should loop through the JSON object and check the uid is present or not.
adminFlag will set to true if the x is present in Admins.
Try the code given below:
function finalCheck(){
var adminJSON = JSON.parse(Admins), // since Admins is string, parse to Json first
length = adminJSON.length,
x = document.forms["myForm"]["uid"].value,
y = document.forms["myForm"]["pwd"].value,
adminFlag = false;
// for loop to find admin is present or not
for(var i = 0; i < length; i++){
if(adminJSON[i].Admin == x){
adminFlag = true;
break;
}
}
}
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