Develop Reference

How to show a message when a button is clicked

I want to show the following message when the button below is clicked using jQuery
<p class="msg-confirm" id="msgConf">
Great! You got this. Let's continue.
</p>
Button:
<input type="button" value="Start" class="btn-start" id="exec">
This message is set as none in CSS:
.msg-confirm{
display: none;
}
I have this function that worked before on a similar context, but without the validation. If the checkbox below is checked, I want this function working.
$("#exec").click(function(){
if($('#d3').is(':checked')){
$("#msgConf").show('slow');
}
});
Checkbox:
<input type="radio" name="image" id="d3" class="input-step1 aheadF1"/>

Let's make use of the simplicity of some of the new features of jQuery such as the .prop() method that will allow us to verify if a checkbox or radio button is checked. For the purpose of this example, I switched the input to a checkbox since it is more appropriate UX/UI wise speaking, however, this property can be verified in both controls. We will use the toggleClass() method of jQuery to toggle the class that hides the P tag and its content initially. I certainly hope this helps.
Happy coding!
$(document).ready(function () {
$("#exec").click(function () {
if ($('#d3').prop('checked')) {
$("p").toggleClass("msg-confirm");
} else {
alert("Please select the checkbox to display info.");
}
});
});
.msg-confirm {
display: none;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.0/jquery.min.js"></script>
<p class="msg-confirm">
Great! You got this. Let's continue.
</p>
<input type="button" value="Start" class="btn-start" id="exec">
<input type="checkbox" name="image" id="d3" class="input-step1 aheadF1"/>

Try this
$("#exec").on("click",function (){
if($('#d3').is(':checked')){
$("#msgConf").css("display","")
}
})

Replacing checkboxes with images?

I am trying to replace three check boxes within an html form with three different images. The idea being that the user can select the pictures by clicking on them rather than clicking on a check box. I've been putting togther some code but can't figure out how to make all the checkboxes selectable. At the moment only the first images works when it is clicked on. Can anyone help me? I'm a real novice with javascript I'm afraid. See fiddle here
The form
<form id="form1" action="" method="GET" name="form1">
<div class="col-md-3">
<img src="https://cdn2.iconfinder.com/data/icons/windows-8-metro-style/128/unchecked_checkbox.png" title="blr" id="blr"><input type="checkbox" id="imgCheck" name="pic1" value=9></div><div class="col-md-3">
<img src="https://cdn2.iconfinder.com/data/icons/windows-8-metro-style/128/unchecked_checkbox.png" title="blr" id="blr"><input type="checkbox" id="imgCheck" name="pic2" value=12></div><div class="col-md-3">
<img src="https://cdn2.iconfinder.com/data/icons/windows-8-metro-style/128/unchecked_checkbox.png" title="blr" id="blr"><input type="checkbox" id="imgCheck" name="pic3" value=7></div>
<input type="submit" name="submit" value="Add" />
</div>
</form>
The javascript
$('#blr').on('click', function(){
var $$ = $(this)
if( !$$.is('.checked')){
$$.addClass('checked');
$('#imgCheck').prop('checked', true);
} else {
$$.removeClass('checked');
$('#imgCheck').prop('checked', false);
}
})

Why use JavaScript at all? You can do this with CSS, the :checked attribute and a label element.
input[type=checkbox] {
display: none;
}
:checked+img {
border: 2px solid red;
}
<label>
<input type="checkbox" name="checkbox" value="value">
<img src="http://lorempixel.com/50/50/" alt="Check me">
</label>

This is happening because you're using the same ID more than one. IDs should be unique. Instead of using id="blr", try using class="blr". I updated the fiddle:
http://jsfiddle.net/0rznu4ks/1/

First, as Amar said, id should be unique. Use classes for multiple elements.
Also pay attention for semicolons and closing html tags.
To your question:
use the function .siblings() to get the relevant checkbox element.
$('.blr').on('click', function () {
var $$ = $(this);
if (!$$.is('.checked')) {
$$.addClass('checked');
$$.siblings('input.imgCheck').prop('checked', true);
} else {
$$.removeClass('checked');
$$.siblings('input.imgCheck').prop('checked', false);
}
});
See demo here:
http://jsfiddle.net/yd5oq032/1/
Good luck!

How to grey out checkbox unless radio button is selected?

very new to javascript, but any help to get me started would be appreciated. I have a simple form:
<div><input type="radio" name="o1" id="burger" />Burger</div>
<div id="yesFries"><input type="checkbox" name="e1" id="fries" />Fries with that?</div>
<div><input type="radio" name="o1" id="pizza" />Pizza</div>
<div><input type="radio" name="o1" id="hotdog" />Hot Dog</div>
I want the "Fries" checkbox greyed out unless the "Burger" radio button is selected. I'm not sure if Javascript or CSS is the best way to do it. Thanks in advance!

what you want to do is set the elements disabled, until the state of the radio changes, that'd be done with javascript, and then you'd add/remove the disabled class in the onchange of the radio button.
What javascript libraries are you considering using? jQuery would make this fairly simple.
$('#burger').change( function () {
if ($('#burger').checked() ) {
$('#fries').removeClass('disabled');
} else {
$('#fries').addClass('disabled');
}
});

Actually with a bit CSS3 you can mock up a very simplistic solution.
Here we don't gray the button out, but you make it visible just if the checkbox is checked.
But, we could also gray it out with a bit more of CSS on top of this example.
You will always have to consider what kind of support you want to offer.
But if you are fine with it working on modern browsers, just give it a go.
Here's the HTML
<label>
<input type="checkbox" name="test" />
<span>I accept terms and cons</span><br><br>
<button>Great!</button>
</label>
Here's the CSS
button { display: none}
:checked ~ button {
font-style: italic;
color: green;
display: inherit;
}
And here's the DEMO http://jsfiddle.net/DyjmM/

I've noticed that you don't specify whether or not you can use jQuery. If that's an option, please see one of the other posts as I highly recommend it.
If you cannot use jquery then try the following:
<script>
function setFries(){
var el = document.getElementById("burger");
if(el.checked)
document.getElementById("fries").disabled = false;
else
document.getElementById("fries").disabled = true;
}
</script>
<div><input type="radio" name="o1" id="burger" onchange="setFries();"/>Burger</div>
<div id="yesFries"><input type="checkbox" name="e1" id="fries" disabled="disabled"/>Fries with that?</div>
<div><input type="radio" name="o1" id="pizza" onchange="setFries();"/>Pizza</div>
<div><input type="radio" name="o1" id="hotdog" onchange="setFries();"/>Hot Dog</div>​
Simple example on jsFiddle

If you're using jQuery, a really-easy-to-use Javascript library (that I would highly recommend for beginners), you can do this in two steps by adding some code to a script tag in your page containing:
$(function(){
$("#burger").change(function() {
if ($(this).is(':checked')) $("#fries").removeAttr("disabled");
else $("#fries").attr("disabled", true);
});
});
This code does three things:
Listens for change events on #burger.
When a change occurs, execute the provided function.
In that function, set the disabled attribute of #fries to the checked property of #burger.

use JQuery
$().ready(function() {
var toggleAskForFries = function() {
if($('#burger').is(':checked')) {
$('#yesFries').show()
else
$('#yesFries').hide()
}
return false
}
toggleAskForFries()
$('#burger').change(toggleAskForFries)
}

Using jQuery: http://jsfiddle.net/kboucher/cMcP5/ (Also added labels to your labels)

You nay try this without any function library
<input type="checkbox" name="e1" id="fries" disabled />
JS
window.onload=function(){
var radios=document.getElementsByName('o1');
for(i=0;i<radios.length;i++) radios[i].onclick=checkFire;
};
function checkFire(e)
{
var fires=document.getElementById('fries');
var evt=e||window.event;
var target=evt.target||evt.srcElement;
if(target.checked && target.id==='burger') fires.disabled=false;
else
{
fires.checked=false;
fires.disabled=true;
}
}
DEMO.

JQuery Dropdown behavior

really new to JQuery.. like 2 hours new. Began to write a drop down menu for a login box like this:
HTML:
<button id="loginButton">Login</button>
When you hover over that, this JQuery runs:
$('#loginButton').live('hover', function() {
login_drop();
});
function login_drop(){
$('#loginBox').fadeIn();
}
$('#loginButton').live('hover', function() {
login_away();
});
function login_away(){
$('#loginBox').fadeOut();
}
And then this HTML DIV appears directly under the button:
<div id="loginBox">
<label for="email_B">Email Address</label>
<input type="text" name="email_B" id="email_B" />
<label for="password">Password</label>
<input type="password_B" name="password_B" id="password_B" />
<input type="submit" id="login" value="Sign in" />
<label for="checkbox"><input type="checkbox" id="checkbox" />Remember me</label>
<span>Forgot your password?</span>
</div>
and the CSS on that DIV is this:
#loginBox {
position:absolute;
top:70px;
right:100px;
display:none;
z-index:1;
}
This all works, but the behavior of it stinks. How do I make it so you can hover over the button put your mouse in the newly appeared DIV and the div won't fade away until your mouse leaves the div?
Sorry if my coding stinks.
Thanks a bunch guys!
--------------------------------EDITS AKA the ANSWERS--------------------
So for all of you reading this down the line. There are so many ways of making this work depending on how you want the user to interact with it.
Here is way 1...This way the login box fades out when your mouse leaves the login button. This is a quick way fo making it work. This answer is thanks to elclanrs besure to Up 1 his answer below if you like this.
JQuery:
$(function(){
$('#loginButton').mouseenter(function(){ $('#loginBox').fadeIn(); });
$('#login').mouseout(function(){ $('#loginBox').fadeOut(); });
});
HTML:
<div id="loginBox">
<label for="email_B">Email Address</label>
<input type="text" name="email_B" id="email_B" />
<label for="password">Password</label>
<input type="password_B" name="password_B" id="password_B" />
<input type="submit" id="login" value="Sign in" />
<label for="checkbox"><input type="checkbox" id="checkbox" />Remember me</label>
<span>Forgot your password?</span>
</div>
CSS:
#loginBox {
position:absolute;
top:70px;
right:100px;
width:200px;
height:200px;
display:none;
z-index:99;
background:url(../images/162.png);
}
WAY 2 is adding is a cancel button like Jared Farrish did here:
http://jsfiddle.net/j4Sj5/4/
if you like his answer, be sure to vot him up below!!
and WAY 3 is what I'm attempting now and should be the most user friendly and flashy. I'll post back once I get it to work correctly!

Ah this is a great one to do yourself. Here's how to do it. First off, live might be overkill for what you need to do. In your case you can use a standard hover event handler in jQuery:
$('#loginButton').hover(function() {
$('#loginBox').fadeIn();
}), function(){
$('#loginBox').fadeOut();
});
The real trick here is that you will trigger the mouse out effect as soon as your mouse moves off the button. This will make the menu disappear when the mouse enters the login box!
So what you actually want to do is handle the hover effect on a containing element. Make sure your #loginButton and #loginBox are contained in a parent element like so:
<div id="loginControl">
<button id="loginButton">Login</button>
<div id="loginBox">...</div>
</div>
Then attach the event to the loginButton's parent:
$('#loginButton').parent().hover(function() { ... }), function(){ ... });
Also, if you are using absolute positioning on #loginBox you'll want to also make sure you use position: relative on it's parent (#loginControl in my example):
#loginControl{ position: relative; }
Let me know if you have any trouble.
Getting More Advanced:
If you want to take this a step further you can try out implementing a simple timeout. I learned early on that it's bad for usability to have a dropdown menu that disappears when I accidentally moved my mouse off the dropdown. To fix this I add a simple delay that prevents the dropdown from hiding if the user's mouse returns to the dropdown within a very short period of time (say 250 to 350ms). I have this as a gist on github in case you want to try it out later: https://gist.github.com/71548

EDIT
(Subsequent EDIT: added a timeout to hide after only a mouseover on the show login element, plus some other updates.)
While I still think using mouseenter and mouseout to handle a login form is not the right way to go from a usability perspective, below is code that demonstrates what Jim Jeffers is describing and attempts to handle some of the pitfalls of the approach:
var setuplogindisplay = function(){
var $loginbox = $('#loginBox'),
$loginshow = $('#loginShow'),
$logincontainer = $('#loginContainer'),
$cancellogin = $('#cancelLogin'),
keeptimeout,
closetimeout;
var keepDisplay = function(){
clearAllTimeouts();
keeptimeout = setTimeout(loginHide, 2000);
};
var loginDisplay = function(){
clearAllTimeouts();
if ($loginbox.is(':hidden')) {
$loginbox.fadeIn();
}
};
var loginHide = function(){
clearAllTimeouts();
if ($loginbox.is(':visible')) {
if (!$(this).is('#cancelLogin')) {
closetimeout = setTimeout(function(){
$loginbox.fadeOut();
}, 1500);
} else {
$loginbox.fadeOut();
}
}
};
function clearAllTimeouts() {
if (keeptimeout) {
clearTimeout(keeptimeout);
}
if (closetimeout) {
clearTimeout(closetimeout);
}
}
$loginshow.mouseover(loginDisplay);
$loginshow.mouseout(keepDisplay);
$logincontainer
.mouseout(loginHide)
.children()
.mouseover(loginDisplay)
.mouseout(keepDisplay);
$cancellogin.click(loginHide);
};
$(document).ready(setuplogindisplay);
http://jsfiddle.net/j4Sj5/19/
Note, you have to make concessions to handle the fact mouseouts will fire when you mouse over elements within the #logincontrol element. I handle this by having them loginDisplay() on mouseenter event (it will work on mouseout, but it makes more logical sense on mouseenter).
I would keep in mind usability of the form when trying to access it and try not to get too clever or over-engineer the user experience. Consider:
<input type="button" id="cancelLogin" value="Cancel" />
Use this to close/hide the form, not an action on another element. If you put the close form action on an event like mouseout, you're going to aggravate your users when they move the mouse accidentally or intentionally out of the way, only to find the login form was closed when they did so. The form, IMO, should have the control which fires the event to hide it according to the user's choice.
<span id="loginButton">Show Login</span>
<div id="loginBox">
<label for="email_B">Email Address</label>
<input type="text" name="email_B" id="email_B" />
<label for="password">Password</label>
<input type="password_B" name="password_B" id="password_B" />
<input type="submit" id="login" value="Sign in" />
<input type="button" id="cancelLogin" value="Cancel" />
<label for="checkbox"><input type="checkbox" id="checkbox" />Remember me</label>
<span>Forgot your password?</span>
</div>
$(document).ready(function(){
var $loginbox = $('#loginBox'),
$button = $('#loginButton'),
$cancellogin = $('#cancelLogin');
var loginDisplay = function(){
$loginbox.fadeIn();
};
var loginHide = function(){
$loginbox.fadeOut();
};
$button.click(loginDisplay);
$cancellogin.click(loginHide);
});
http://jsfiddle.net/j4Sj5/4/

Instead of reinventing the wheel, I would recommend looking into a jquery plugin like hoverintent. It does most of the work for you.
And, on a related note, .live() is being deprecated in jquery as of v1.8. you should instead use .on().

This should work. Plus you don't need live() which by the way is deprecated in favor on on(). You also don't need those functions for a simple fadeIn()/fadeOut():
$('#loginButton').mouseenter(function(){ $('#loginBox').fadeIn(); });
$('#loginBox').mouseout(function(){ $(this).fadeOut(); });

How to do this box in Javascript?

I'm trying to do the following sort of thing in Javascript, where you click on the down arrow and it expands downward and displays options (I'll have some input fields and checkboxes and text and stuff in there).
Can anyone please help me out or point me in the right direction, I've tried google searching but I have no idea what they're even called in the Javascript world. "Javascript expanding box", "javascript drop down box", "javascript expanding modal dialog", etc. Nothing seems to hit.
Here's the example:
http://imageshack.us/f/810/examplebe.jpg/
There will be a submit button in the top section (not in the expand section), which will submit the options in the drop down menu as well as the options in the section near the submit button.
Thanks!

Set your markup something like this:
<div class="expandingBox" id="expandingBox">
<div id="expandingBoxContent">
//Content here
</div>
</div>
Expand
and in your CSS, the expandingBox class should be set to:
.expandingBox
{
height: <your initial box height here>
overflow: hidden;
// other styling here
}
Then to get it to expand, you can do something like:
$('#expandButton').bind('click', function(){
var contentHeight = $('#expandingBoxContent').height();
$('#expandingBox').animate({ height: contentHeight }, 1000);
}

a little demo. it may help you
HTML:
<input id="login_button" type="button" value="∨" />
<form name-"myForm" id="login_form" style="height:150px">
<div id="toggle" style="width:150px; height:100px;position:absolute;top:30px;left:20px;background:#9BCDFF;display:none;padding:10px">
<label for="name">Name:</label>
<input type="text" name="name" />
<label for="password">Password:</label>
<input type="text" class="password" />
</div>
<input type="submit" id="#submit" value="Submit" style="position:absolute; top:150px"/>
</form>
JQUERY:
$('#login_button').click(function(e) {
$('#toggle').slideToggle(1200,
function() {});
});
$('#submit').click(function() {
$('form[name=myForm]').submit(function() {
alert('form submit');
});
});

$('#toggleBtn').click(function(){ $("#toggleBox").toggle();});

If you're using jQuery, I think you might want to look at the jQuery UI implementation of the collapsible accordion.

THere is an inbuilt jquery effect 'SlideDown'. Check it here: http://api.jquery.com/slideDown

It should not be really difficult. You can use jQuery animation effects for that.
Some code example, just to give you direction:
// html
<div id="some-container">Click me!</div>
<div id="some-container-to-show">Hey, I'm appeared on screen!</div>
// js
$(function () {
$("#some-container-to-show").hide();
$("#some-container").live("click", function () {
$("#some-container-to-show").slideDown();
});
});