[英]How to read JSON data and compare it with a variable
我在JSON文件中有兩組數據:
Admins = [{"Admin":"jhonmorris"},{"Admin":"clarkechris"}]
UIDS = [{"password":"Jhon", "username":"jhonmorris"}, {"password":"Jean", "username":"jeanheadly"}, {"password":"Clarke", "username":"clarkechris"}]
我有一個用戶登錄頁面的HTML如下:
<html>
<head>
<script type="text/javascript" src="data.json" ></script>
<script type="text/javascript" src="checking.js" ></script>
</head>
<body>
<form name="myForm" method="post">
UserName<input type="text" id="uid" value="uid"/>
UserPassword<input type="password" id="pwd" value="pwd"/>
<input type="submit" value="Submit" onclick="fnCheck()"/>
</form>
</body>
</html>
我有兩種類型的用戶,一種是admin
( Admins
在JSON中 ),另一種是regular user
(除了JSON中的 Admins
之外的任何其他用戶用戶名)。 單擊提交按鈕時,我想獲取在var x
輸入的userID,並檢查它是否具有與JSON中的UIDS
相對應的正確密碼。 此外,我想檢查相同的用戶名是否屬於JSON中的Admins
數據集。 如果是,我想將他重定向到谷歌。 如果沒有,我想將他重定向到雅虎。 我正在使用JavaScript讀取JSON數據,如下所示:
function fnCheck(){
alert("in fnCheck()");
if(checkUP() == true){
alert("checkUP returned true! UserID and Password are correct");
if(checkAdmin() == true){
alert("checkAdmin() returned true! going to admin page now");
window.location = 'http://www.google.com';
}
else if(checkAdmin() == false){
alert("checkAdmin() returned false! going to userIndex page now");
window.location = 'http://www.yahoo.com';
}
}
else{
alert("checkUP() returned false. Creds are Invalid!");
}
}
function checkAdmin(){
alert("in checkAdmin()");
//var adminJSON = JSON.parse(Admins);
//length = adminJSON.length;
x = document.forms["myForm"]["uid"].value;
for(var key in Admins){
var admin = Admins[key]
//alert(""+admin.Admin)
if(admin.Admin == x){
alert("Admin match found. Returning true!");
return true;
}
else{
alert("Admin match not found. Returning false");
return false;
}
}
}
function checkUP(){
alert("hello!!");
var x = document.forms["myForm"]["uid"].value;
var y = document.forms["myForm"]["pwd"].value;
alert("In checkUP, value of x = "+x+" calue of y = "+y);
for(var key in UP){
var user = UP[key]
//if(user.username == x && user.password == y){
if(x.match(user.username) && x.match(user.password)){
alert("user.username = "+user.username+"user.password = "+user.password+" User Id and password matched. Returning true now");
//alert("Matching "+x+ "with "+user.username"+ and "+y+" with user.password"+ y);
//break;
return true;
}
else{
//alert("User ID and password did not match. Returning false now. user.username = "+user.username+" user.password = "+user.password);
//break;
return false;
}
}
}
我試過發出警報,找出所有地方出了什么問題,但我仍然無法弄清楚出了什么問題。 非常感謝幫助!
這里不調用你的函數,不要使用提交按鈕的onclick
事件,最好使用onsubmit="fnCheck()"
形式的onsubmit
事件:
<form name="myForm" method="post" onsubmit="fnCheck(event)">
注意:
在JSON中存儲密碼是一種非常糟糕的做法,會使您的頁面非常脆弱和不安全。
給定文件不提供有效的JSON結構,這些只是JavaScript對象,假設您有一個有效的JSON,使用JSON.parse(json)
來解析您的json對象/數組。
undefined
變量,例如UP
的情況。 onsubmit
測試您的函數是否正確調用,但仍需要刪除/更正undefined
變量。 var Admins = [{ "Admin": "jhonmorris" }, { "Admin": "clarkechris" }]; UIDS = [{ "password": "Jhon", "username": "jhonmorris" }, { "password": "Jean", "username": "jeanheadly" }, { "password": "Clarke", "username": "clarkechris" }]; function fnCheck(e) { e.preventDefault(); console.log("in fnCheck()"); if (checkUP() == true) { console.log("checkUP returned true! UserID and Password are correct"); if (checkAdmin() == true) { alert("checkAdmin() returned true! going to admin page now"); window.location = 'http://www.google.com'; } else if (checkAdmin() == false) { alert("checkAdmin() returned false! going to userIndex page now"); window.location = 'http://www.yahoo.com'; } } else { alert("checkUP() returned false. Creds are Invalid!"); } } function checkAdmin() { alert("in checkAdmin()"); //var adminJSON = JSON.parse(Admins); //length = adminJSON.length; x = document.forms["myForm"]["uid"].value; for (var key in Admins) { var admin = Admins[key] //alert(""+admin.Admin) if (admin.Admin == x) { console.log("Admin match found. Returning true!"); return true; } else { console.log("Admin match not found. Returning false"); return false; } } } function checkUP() { console.log("hello!!"); var x = document.forms["myForm"]["uid"].value; var y = document.forms["myForm"]["pwd"].value; console.log("In checkUP, value of x = " + x + " calue of y = " + y); for (var key in UP) { var user = UP[key] //if(user.username == x && user.password == y){ if (x.match(user.username) && x.match(user.password)) { console.log("user.username = " + user.username + "user.password = " + user.password + " User Id and password matched. Returning true now"); return true; } else { return false; } } }
<form name="myForm" method="post" onsubmit="fnCheck(event)"> UserName <input type="text" id="uid" value="uid" />UserPassword <input type="password" id="pwd" value="pwd" /> <input type="submit" value="Submit" /> </form>
編輯:
在函數中,您在if語句中返回true / false,因此它將始終在第一次迭代中保留該函數。
您應該使用布爾標志並在if語句中相應地更改其值,並僅在函數的末尾返回它:
function checkUP() {
console.log("hello!!");
var bool = false;
var x = document.forms["myForm"]["uid"].value;
var y = document.forms["myForm"]["pwd"].value;
console.log("In checkUP, value of x = " + x + " calue of y = " + y);
for (var key in UP) {
var user = UP[key]
if (x === user.username && y === user.password) {
console.log("user.username = " + user.username + "user.password = " + user.password + " User Id and password matched. Returning true now");
return true;
}
}
return bool;
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.