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How to do unsuccess to submit form jquery

I've got a problem regarding my contact form page. I did callback after clicking the submit button. I tried not to fill name textbox but form still submits.
My code:
function sendFeedback() {
alert("Thank you for the feedback :)");
}
<form>
<p class="font3">Name:</p>
<input name="name" type="text" maxlength="50" size="30" required/>
<br />
<p class="font3">Email:</p>
<input name="email" type="email" placeholder="" required/>
<br />
<p class="font3">Subject:</p>
<input name="subject" type="text" required/>
<br />
<p class="font3">Message:</p>
<textarea name="comment" row="80" cols="30" required></textarea>
<br>
<br>
<input type="submit" value="Submit" onclick="sendFeedback()">
<input type="reset" value="Reset">
</form>

You should change <form> to <form onsubmit="test()",where test() would go something like this:
test(e){
e.preventDefault();
/* do some validations here */
document.querySelector("form").submit();
}
Hope it helps

The form submitting and your alert triggering are two completely different things. The required attributes you have on the inputs are working correctly. If you leave any of the required inputs blank, the form will not submit to the server, instead you'll trigger standard error messaging in whatever browser you're using (usually a red outline and a popover).
The bit of JavaScript you have (i.e. your alert) will trigger regardless of whether the form submits successfully or not since it's executed BEFORE the submit goes through. You need to either do something like e.preventDefault() or return false at the end of your function, but that will prevent the form from being submitted altogether.
As #dvenkatsagar said, your best option is to change your onclick to onsubmit.

Javascript Form not posting anything into the body

The Javascript form submits all the information except for the body part.
<form action="javascript:;" method="post" enctype="text/plain" onSubmit="this.action='mailto:'
+document.getElementById('friend1').value+','
+document.getElementById('friend2').value+','
+document.getElementById('friend3').value+
'?cc=test#test.com&subject=Tester and space&body=testit';">
<input type="Email" id="friend1" value="" required placeholder="1st friend's email"/><br>
<input type="Email" id="friend2" value="" required placeholder="2nd friend's email"/><br>
<input type="Email" id="friend3" value="" required placeholder="3rd friend's email"/><br>
<input type="submit" value="Send">
</form>
The part that is suppose to change the contents of the body located in the "onSubmit" action in the form:
&body=testit
Any help would be appreciated. Thanks in advance. :)

Replace your spaces in the subject with %20. I remember having an issue with this years ago. It has to do with the encoding.
&subject=Tester%20and%20space

Text disappear on click, but new text entered disappears to

Well I am making my first landing page, something not overly professional, I want to get in the hang of being able to make simple web pages myself.
So my issue is that whenever you click on the textbox, the text disappears. Which it should. But when the user enters text, clicks off the text box and clicks back on it, that text disappears.
How can I make it so that the newly entered text does not disappear?
My current code for the text fields:
http://pastie.org/8366114
<input type="text" value="Enter Your First Name" id="form"
onblur="javascript:if(this.value=='')this.value='Enter Your First Name';"
onclick="javascript:if(this.value=='Enter Your First Name')this.value='';"
onFocus="this.value=''">
</input></br>
<input type="text" value="Enter Your Email" id="form"
onblur="javascript:if(this.value=='')this.value='Enter Your Email';"
onclick="javascript:if(this.value=='Enter Your Email')this.value='';"
onFocus="this.value=''">
</input></br>
<input type="text" value="Enter Your Phone Number" id="form"
onblur="javascript:if(this.value=='')this.value='Enter Your Phone Number';"
onclick="javascript:if(this.value=='Enter Your Phone Number')this.value='';"
onFocus="this.value=''">
</input></br>
<input type="submit" class="button" name="submit" value=""></input>
I apologize for not posting it on here, but I don't know how to do the code block thing..

to do this with javascript all you need is
<input type="text" value="Enter Your First Name"
onblur="if(this.value=='')this.value='Enter Your First Name';"
onfocus="if(this.value=='Enter Your First Name')this.value='';" />
DEMO
however you can just simply use the html5 placeholder reference
also
dont use the same id more then once, instead use class.
input is self-closing (like <br>)
</br> is wrong use <br> or <br />
here is a working version of your code, i also added submit as the value for your button
<input type="text" placeholder="Enter Your First Name" class="form"><br/>
<input type="text" placeholder="Enter Your Email" class="form"><br/>
<input type="text" placeholder="Enter Your Phone Number" class="form"><br/>
<input type="submit" class="button" name="submit" value="submit">
DEMO

<input type="text" value="Enter Your First Name" id="form" onblur="if(this.value=='')this.value='Enter Your First Name';" onfocus="if(this.value=='Enter Your First Name')this.value='';" />
or if you are using HTML5, you can use placeholder attribute:
<input type="text" placeholder="Enter Your First Name" id="form" />

you have to make the onfocus event the same as the onclick event, e.g:
onfocus="javascript: if (this.value == 'Enter Your First Name') this.value = '';"

onFocus="this.value=''"
This is causing your text fields to be reset to blank unconditionally.
You probably only need onclick or onfocus here, and since onfocus will take into account tabbing into the field as well as clicking it with the mouse, I would recommend moving the code from onclick to onfocus and deleting onclick altogether.

Remove content from form onclick:
in haml:
= f.text_field :title, :value => 'Name', :onfocus => "if (this.value=='Name') this.value='';"
in html:
<input id="project_title" name="project[title]" onfocus="if (this.value=='Name') this.value='';" type="text" value="Name">

Post data in two forms, The first form doesn't send any data until the second one is filled out

Basically I have two forms. I want to have a user upon registration fill out the first lot of information. Press next (submit), then fill out the second lot of information. Once they press register, submit both sets of POST information.
What I have is this - two sections with two different forms (there's a reason why these are split into two forms - part of the look of the site):
<section class="first">
<header>
<h1>Signup 1/2</h1>
</header>
<form id="firstForm">
<label>First Name</label>
<input type="text" class="input-text" value="" name="firstName" required />
<label>Surname</label>
<input type="text" class="input-text" value="" name="Surname" required />
<label>Username</label>
<input type="text" class="input-text" value="" name="Username" required />
<input type="submit" name="firstSubmit" value="next"/>
</form>
</section>
<section class="second">
<header>
<h1>Signup 2/2</h1>
</header>
<form name="secondForm" class="clearfix">
<label>Your Email</label>
<input type="email" class="input-text" value="" name="email" required />
<label>Password</label>
<input type="text" class="input-text" value="" name="password" required />
<input type="submit" name="secondSubmit" value="Register" />
</form>
</section>
So the second section is hidden until the user clicks the next button (submit). I have javascript stopping it from submitting, and hiding the first section, and making the second one appear:
<script type="text/javascript">
$("#firstForm").bind("submit", nextForm);
function nextForm() {
$('.first').css("display", "none");
$('.second').css("display", "block");
return false;
}
This works.
My issue is then getting the secondForm to submit, but POST both the first and second's information, as if with the one submit button, I was submitting both. Is this possible? And if so, how?
To use a GET method I'd go:
$("#secondForm").bind("submit", submitForm);
function submitForm() {
document.getElementById("firstForm").submit();
document.getElementById("secondForm").submit();
}
But I don't want to do that, as GET = a bad idea for sensitive info.

I would use one form, but wrap the two sets of inputs in divs. Just hide the first div and show the second on the first button click (which you wouldn't keep as a submit button), then submit the entire form on the second button click.

Hiding and showing Divs with form validation

Upon submit I am trying to have "quiz" hide and have "thanks" be shown. All was working correct until I added a JavaScript form validation code, and now it just reloads the first div "welcome" I thought adding "#thanks" to the action upon submit would solve the issue, but it did not. Then trying to add an "if true" statement to my form validation ended up breaking the form validation. I am using jquery.validate to validate my form as suggested. With the current code it skips the validation and just shows "thanks" If anyone has any suggestions it would be greatly appreciated.
<div id="quiz">
<form class="cmxform" id="commentForm" method="get" action="" onSubmit="showHide(); return false;">
<label for="cname">Name</label>
<input id="cname" name="name" size="20" class="required" minlength="2" />
</p>
<p>
<label for="ccompany">Company Title</label>
<input id="ccompany" name="company" size="20" class="required company" minlength="2" />
</p>
<p>
<label for="cnumber">Phone Number</label>
<input id="cnumber" name="number" size="20" class="required number" />
</p>
<p>
<label for="cemail">Email</label>
<input id="cemail" name="email" size="20" class="required email" />
<p></p>
<input class="submit" type="submit" value="Submit" align="center"/>
</form>
</div>
<div id="thanks"><h2>Thank you.</h2>
You will receive an email momentarily
</div>
<script>
$("#begin").click(function(){
$("#quiz").show();
$("#welcome").hide();
});
function showHide(){
$("#thanks").show();
$("#quiz").hide();
};
</script>

All I can say is that you are doing it wrong.... While the form validation that you are doing can work there are a lot of good form validation jquery plugins that would both simplify your life and add a much richer user experience. jquery.validate is probably the most widely used library and would be well worth using.