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Thread: How do I get data from HTML form

  1. #1
    Join Date
    May 2012
    Posts
    8

    How do I get data from HTML form

    We were givent the following DOM problem where we have to take the emai and password and if it is correct sent it to a website if wrong have it state bad email or password. My question is how do I get the data that is enterd into the form? do I have to use a oneclick to have it call the valid login function? Thanks.


    <!doctype html>
    <html lang="en">
    <head>
    <meta charset="utf-8">
    <title>DOM problem</title>
    <meta name="author" content="unknown">
    <style type="text/css">

    body {
    background-color: gray;
    font-family: Tahoma, sans-serif;
    }

    fieldset {
    width: 44em;
    background-color: olive;
    color: white;
    font-family: Tahoma, sans-serif;
    }

    label {
    margin-top: 1em;
    margin-right: 0.5em;
    width: 4em;
    float: left;
    text-align: right;
    display: block;
    }

    input {
    margin-top: 1em;
    }


    textarea {
    margin-top: 1em;
    width: 40em;
    height: 4em;
    padding: 1em;
    border: none;
    overflow: hidden;
    background-color: olive;
    color: white;
    font-family: Tahoma, sans-serif;
    }

    .loginbutton {
    margin-top: 1em;
    margin-left: 5.5em;
    }

    </style>

    <script type=text/javascript>
    <!--

    var logins = ['dwright@mets.com', 'djeter@yankees.com', 'msmith@aol.com'];
    var passwords = ['mets86', 'yankee10', 'password'];

    function isValidLogin(login, emailList, passwd, passwdList) {
    for (var i=0; i < emailList.length; i++)
    if (login == emailList[i])
    break;

    if (i == emailList.length)
    return false;
    else {
    if (passwd == passwdList[i])
    return true;
    else
    return false;
    }
    }


    //-->
    </script>

    </head>

    <body>

    <form name='loginForm'>

    <fieldset>
    <legend>please login</legend>
    <label>email</label> <input type="text" name="email" id="email" size="30" /><br/>
    <label>password</label> <input type="password" name="passwd" id="passwd" size="30" /><br/>
    <input type="button" name="login" id="login" value= "login" class="loginbutton" /><br/>
    <textarea name="messageArea" id="messageArea" rows="2" cols="40"></textarea>
    </fieldset>

    </form>

    <script>
    </script>
    </body>
    </html>

  2. #2
    Join Date
    May 2011
    Location
    Lancashire
    Posts
    35
    Hi,

    you will need to "submit" the information (i.e. using <input type="submit" etc.../> button) and then in the form tag use an onsubmit event handler to run the validation functions.

    Hope this helps
    LF

  3. #3
    Join Date
    May 2012
    Posts
    8
    LF thanks for pointing me in the direction I need to go.

    Rusty

  4. #4
    Join Date
    Feb 2012
    Location
    Bokaro Steel City (Jharkhand), India!
    Posts
    194
    See this:
    HTML Code:
    <!doctype html>
    <html>
    <body>
        <form name="_form" action="#" method="post" onsubmit="return Check()">
            <label>Email ID:</label> <input type="email" name="_email" /> <br/>
            <label>Password:</label> <input type="password" name="_pwd" /> <br/>
            <input type="submit" value="Log in" />
        </form>
        
        <script>
            var Check = function () {
                var eList = ['a@a.com', 'b@b.com', 'v@v.com'];
                var pList = ['aa', 'bb', 'vv'];
            
                var email = document.forms['_form'].elements['_email'].value;
                var pwd = document.forms['_form'].elements['_pwd'].value;
                
                for(i=0; i<eList.length; i++) {
                    if(email == eList[i]) {
                        for(j=0; j<pList.length; j++) {
                            if(pwd == pList[j]) {
                                alert('Correct feed!');
                                return true;
                                break;
                            }
                        }
                    }
                }
                alert('Incorrect feed!');
                return false;
            }
        </script>
    </body>
    </html>
    "It will never rain roses: when we want to have more roses, we must plant more roses." - George Eliot

  5. #5
    Join Date
    May 2012
    Posts
    8
    TAW Thanks!

    Rusty

  6. #6
    Join Date
    May 2012
    Posts
    8
    I am tryingn to call the isValidLogin from the
    <input type="button" name="login" id="login" value= "login" class="loginbutton" /><br/>

    I added <input type="button" name="login" id="login" value= "login" class="loginbutton" onclick="isValidLogin" /><br/>
    but it doesn't seem to call the function. Am I missing somthing?

    Thanks,

    Rusty

  7. #7
    Join Date
    Nov 2010
    Posts
    1,088
    Quote Originally Posted by RustyC View Post
    Am I missing somthing?
    just a couple of brackets

    Code:
    onclick="isValidLogin()"

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