Mercurial > rlmcintyre

     1 var showingLoggedIn = false;

     2 var messageElement = false;

     3 var messageP = false;

     4 

     5 // focusField method: called when username and password gain focus

     6 function focusField()

     7 {

     8 	try {

     9 		if (messageElement != false)

    10 		{

    11 			document.getElementById('message').removeChild(messageElement);

    12 		}

    13 		getSeed();

    14 	}

    15 	catch (e)

    16 	{ } // do nothing... hides an apparent firefox bug: https://bugzilla.mozilla.org/show_bug.cgi?id=236791

    17 }

    18 

    19 // blurField method: called when username and password are blurred

    20 function blurField()

    21 {

    22 	try {

    23 		validateLogin();

    24 	}

    25 	catch (e)

    26 	{ } // hide bug https://bugzilla.mozilla.org/show_bug.cgi?id=236791

    27 }

    28 

    29 // showLogin method: displays if necessariy that we are logged in

    30 function showLogin() {

    31 	if (messageElement != false)

    32 	{

    33 		try {

    34 			document.getElementById('message').removeChild(messageElement);

    35 		}

    36 		catch (e) { }

    37 	}

    38 	if (loggedIn)

    39 	{

    40 		showingLoggedIn = true;

    41 		

    42 		loginPanel = document.getElementById('login');

    43 		p = document.createElement('p');

    44 		pre = document.createTextNode('Logged in as ');

    45 		strong = document.createElement('strong');

    46 		strong_text = document.createTextNode(fullname);

    47 		strong.appendChild(strong_text);

    48 		mid = document.createTextNode(' [');

    49 		a = document.createElement('a');

    50 		a.href='javascript:logout();';

    51 		a_text = document.createTextNode('logout');

    52 		a.appendChild(a_text);

    53 		post = document.createTextNode(']');

    54 		

    55 		p.appendChild(pre);

    56 		p.appendChild(strong);

    57 		p.appendChild(mid);

    58 		p.appendChild(a);

    59 		p.appendChild(post);

    60 		

    61 		messageP = document.getElementById('message');

    62 		loginPanel.removeChild(messageP);

    63 		loginPanel.appendChild(p);

    64 		

    65 		messageElement = p;

    66 		

    67 		document.getElementById('username').disabled = 'disabled';

    68 		document.getElementById('password').disabled = 'disabled';

    69 		

    70 		document.getElementById('comments').focus();

    71 	}

    72 	else

    73 	{

    74 		messageElement = document.createElement('strong');

    75 		messageElement.appendChild(document.createTextNode(' ' + messages));

    76 		messageElement.style.color = '#ff0000';

    77 		document.getElementById('message').appendChild(messageElement);

    78 	}

    79 }

    80 

    81 // logout method: prepares for a new login

    82 function logout()

    83 {

    84 	resetLogin();

    85 	username = document.getElementById('username');

    86 	password = document.getElementById('password');

    87 	loginPanel = document.getElementById('login');

    88 	username.value = '';

    89 	password.value = '';

    90 	username.disabled = null;

    91 	password.disabled = null;

    92 	

    93 	loginPanel.removeChild(messageElement);

    94 	loginPanel.appendChild(messageP);

    95 	

    96 	messageElement = false;

    97 	showingLoggedIn = false;

    98 	

    99 	username.focus();

   100 }

   101 

   102 // setupLogin method: to be called on page load, sets up the login script

   103 function setupLogin()

   104 {

   105 	username = document.getElementById('username');

   106 	password = document.getElementById('password');

   107 	addEvent(username, 'focus', focusField);

   108 	addEvent(username, 'blur', blurField);

   109 	addEvent(password, 'focus', focusField);

   110 	addEvent(password, 'blur', blurField);

   111 }

   112 

   113 

   114 // function to add events to the page in a cross-browser manner

   115 function addEvent(objObject, strEventName, fnHandler) { 

   116 	// DOM-compliant way to add an event listener 

   117  	if (objObject.addEventListener) {

   118 		objObject.addEventListener(strEventName, fnHandler, false); 

   119 	}

   120 	// IE/windows way to add an event listener 

   121 	else if (objObject.attachEvent) {

   122 		objObject.attachEvent('on' + strEventName, fnHandler); 

   123 	}

   124 }

   125 

   126 addEvent(window,'load',setupLogin);
author	Robert McIntyre <rlm@mit.edu>
date	Mon, 27 Sep 2010 16:57:26 -0400
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