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Reveal fields if needed

I'm trying to make a contact-form in php. You can find it here.
I try to make the textbox with datepicker invisible until the visitor checks the radiobutton "ja", only then it needs to be visible.
Here's the code for the form:
var FormStuff = {
init: function() {
this.applyConditionalRequired();
this.bindUIActions();
},
bindUIActions: function() {
$("input[type='radio'], input[type='checkbox']").on("change", this.applyConditionalRequired);
},
applyConditionalRequired: function() {
$(".require-if-active").each(function() {
var el = $(this);
if ($(el.data("require-pair")).is(":checked")) {
el.prop("required", true);
} else {
el.prop("required", false);
}
});
}
};
FormStuff.init();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<form method="post" action="mail.php">
<!--< ?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>-->
<table id="contactForm">
<tr>
<th colspan="2">Contact</th>
</tr>
<div>
<tr>
<td><label>Reservatie: </label></td>
<td>
<table>
<tr>
<td id="nospacing"><input type="radio" name="reservatie" value="Ja" id="ja"></td>
<td id="nospacing"><label for="reservatie">Ja</label></td>
<td id="nospacing"><input type="radio" name="reservatie" value="Nee" id="nee"></td>
<td id="nospacing"><label for="reservatie">Nee</label></td>
</tr>
</table>
</td>
</tr>
<div class="reveal-if-active">
<tr>
<td><label for="reservering">Reserveringsdatum: </label></td>
<td><input type="text" id="reservering" autocomplete="off" name="reservering" class="require-if-active" data-require-pair="#ja"></td>
</tr>
</div>
</div>
<tr>
<td><input type="submit" name="submit" value="Verzenden" /></td>
<td><input type="reset" value="Formulier wissen" class="alt" /></td>
</tr>
</table>
</form>

you use $('input[type="radio"]').click(function(){}) to detect you input change see code snippet.
var FormStuff = {
init: function() {
this.applyConditionalRequired();
this.bindUIActions();
},
bindUIActions: function() {
$("input[type='radio'], input[type='checkbox']").on("change", this.applyConditionalRequired);
},
applyConditionalRequired: function() {
$(".require-if-active").each(function() {
var el = $(this);
if ($(el.data("require-pair")).is(":checked")) {
el.prop("required", true);
} else {
el.prop("required", false);
}
});
}
};
FormStuff.init();
/* this is the function to handle you need */
$(function(){
$('input[type="radio"]').click(function(){
if ($('input[type="radio"]#ja').is(':checked'))
{
$(".reveal-if-active").show();
}
else if('input[type="radio"]#nee'){
$(".reveal-if-active").hide();
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<form method="post" action="mail.php">
<!--< ?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>-->
<table id="contactForm">
<tr>
<th colspan="2">Contact</th>
</tr>
<div>
<tr>
<td><label>Reservatie: </label></td>
<td>
<table>
<tr>
<td id="nospacing"><input type="radio" name="reservatie" value="Ja" id="ja"></td>
<td id="nospacing"><label for="reservatie">Ja</label></td>
<td id="nospacing"><input type="radio" name="reservatie" value="Nee" id="nee"></td>
<td id="nospacing"><label for="reservatie">Nee</label></td>
</tr>
</table>
</td>
</tr>
<div >
<!-- make the tr the element to hide and show -->
<tr class="reveal-if-active" style="display:none">
<td ><label for="reservering">Reserveringsdatum: </label></td>
<td><input type="text" id="reservering" autocomplete="off" name="reservering" class="require-if-active" data-require-pair="#ja"></td>
</tr>
</div>
</div>
<tr>
<td><input type="submit" name="submit" value="Verzenden" /></td>
<td><input type="reset" value="Formulier wissen" class="alt" /></td>
</tr>
</table>
</form>

Firstly, your markup is kinda messed up:
You shouldn't mix div tags with tr, only tr tags should be present on the same 'level' of nesting in table tag
Secondly, answering you actual question - add click event listeners on the radiobuttons, so that when YES is clicked, you make visible your "reveal-if-active" row:
var inputToHide = document.getElementsByClassName("reveal-if-active")[0];
var jaInput = document.getElementById("ja");
var neeInput = document.getElementById("nee");
function makeInputVisibleAgain() {
inputToHide.style.display = "block";
}
function hideInput() {
inputToHide.style.display = "none";
}
jaInput.addEventListener("click", makeInputVisibleAgain);
neeInput.addEventListener("click", hideInput);
Thirdly - don't use several ids with same name, better change your id="nospacing" to class

It is possible that you want something like this? Notice that it's very easy to do it in very few lines of code. Since you're a beginner I'll explain:
$( ... ); is jQuery's way to say "when the page is totally loaded, start executing what's inside". In case you didn't know, without this the scripts would start executing any time and could cause errors, mainly because of not finding the elements you work with.
$('input[name="reservatie"]').change(function(){ ... });: the radio buttons have name "reservatie", so when they are changed it will execute the function inside change().
$('#reveal').prop('hidden', !$('#ja').prop('checked'));: I identified the row of the table where the datepicker was as "reveal", because, maybe I'm wrong, but putting one row of it inside of a div didn't let my code go well, so I believe that was just wrong. I deleted the div and used the row instead. So, its attribute hidden will be the opposite of the checked property of "ja", which means, if "ja" is checked, the datepicker won't be hidden, and if it's not, it will.
Hope it helps you.
$(function(){
$('input[name="reservatie"]').change(function(){
$('#reveal').prop('hidden', !$('#ja').prop('checked'));
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<form method="post" action="mail.php">
<!--< ?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>-->
<table id="contactForm">
<tr>
<th colspan="2">Contact</th>
</tr>
<div>
<tr>
<td><label>Reservatie: </label></td>
<td>
<table>
<tr>
<td id="nospacing"><input type="radio" name="reservatie" value="Ja" id="ja"></td>
<td id="nospacing"><label for="reservatie">Ja</label></td>
<td id="nospacing"><input type="radio" name="reservatie" value="Nee" id="nee"></td>
<td id="nospacing"><label for="reservatie">Nee</label></td>
</tr>
</table>
</td>
</tr>
<tr id="reveal" hidden>
<td><label for="reservering">Reserveringsdatum: </label></td>
<td><input type="text" id="reservering" autocomplete="off" name="reservering" class="require-if-active" data-require-pair="#ja"></td>
</tr>
</div>
<tr>
<td><input type="submit" name="submit" value="Verzenden" /></td>
<td><input type="reset" value="Formulier wissen" class="alt" /></td>
</tr>
</table>
</form>

To show error message on ajax error : function()

I want to show error message in directed page if error part is fire in my ajax.but when it goes to this directed page it not show error message if i refresh this page it shows error message.below is my code.
index.html
<form method="post" name="myForm" action="tracking.php">
<input type="text" name="number" id="number" placeholder="Enter LR Number" required>
<input type="submit" name="submit" value="Go">
</form>
tracking.php
<script>
$(document).ready(function () {
var from = "";
$('#loadings').show();
$.ajax({
type: "GET",
url: 'http://apis.abc.abc/api/Get_Loadsheet_Details/<?php echo $number; ?>',
dataType: 'json',
success: function (response) {
$('#loadings').hide();
console.log(response);
document.getElementById('lrid').innerHTML = "LR NO: " + response[0].LRSUFIX + response[0].LR_NO;
document.getElementById('consign').innerHTML = response[0].COMPANY_NAME;
document.getElementById('from').innerHTML = response[0].LOADFROMMST;
document.getElementById('dest').innerHTML = response[0].DESTINATION;
document.getElementById('case').innerHTML = response[0].NO_OF_PKT;
document.getElementById('lrsta').innerHTML = response[0].LR_STATUS;
document.getElementById('lr').innerHTML = response[0].lrLoadStatus;
document.getElementById('vecno').innerHTML = response[0].VEHICLE_NO;
document.getElementById('lrstatus').innerHTML = response[0].LOADIG_STATUS;
document.getElementById('ldate').innerHTML = response[0].DATE;
}, error: function (errors) {
console.log(errors);//alert('hi');
$('#loadings').hide();
$('#error').html("<h2><span style='color:red;'>No data found on this LR No.</span></h2>");
}
});
});
</script>
<section>
<div id="error"></div>
<div class="loader-div" style="position:relative;" ><img id="loadings" src="images/loading2.gif" style=" left: 40%;
position: absolute;
top:250px;
z-index:1111;"></div>
<div class="container" >
<div class="body_left" id="container">
<h1 class="heading_3">Tracking Details</h1>
<table width="100%" class="track">
<tr>
<th >Order Information</th>
<th id="lrid"></th>
</tr>
<tr>
<td>Consignee</td>
<td id="consign"> </td>
</tr>
<tr>
<td>From</td>
<td id="from"></td>
</tr>
<tr>
<td>Destination</td>
<td id="dest"> </td>
</tr>
<tr>
<td>Cases</td>
<td id="case"> </td>
</tr>
<tr>
<td>LR Status</td>
<td id="lrsta"></td>
</tr>
<tr>
<td>LR</td>
<td id="lr"></td>
</tr>
</table>
<br>
<br>
<table width="100%" class="track">
<tr>
<th colspan="2">Load Information</th>
</tr>
<tr>
<td>VEHICLE NUMBER: </td>
<td id="vecno"></td>
</tr>
<tr>
<td>LOAD STATUS </td>
<td id="lrstatus"> </td>
</tr>
<tr>
<td>LOAD DATE:</td>
<td id="ldate"> </td>
</tr>
</table>
</div>
</div>
</section>

Try to put your Script code underneath HTML codes. Because Jquery can't find the selector "#error" before html get loaded.
Just make a try.

why JQuery serialize() is not working in jquery/Ajax request?

I am using jQuery/Ajax to submit a form but when I submit it BUT it's return empty value in .php page. I think the jQuery serialize() is not getting the data from the FORM. can you please fix it why it's not working ?
Here is my html code :
<form id="phone_form">
<table width="290" border="0" cellpadding="0" cellspacing="0" style="margin-bottom:0px;" id="phoneWraper">
<tr>
<td colspan="2"><div id="phone_success"></div></td>
</tr>
<tr><td>Phone ( + )</td><td> </td></tr>
<tr>
<td align="right">Work :</td>
<td align="right"><input value="<?php echo $work_phone; ?>" type="text" name="work_phone" id="work_phone" placeholder="work phone"/></td>
</tr>
<tr>
<td align="right">Mobile :</td>
<td align="right"><input value="<?php echo $mobile_phone; ?>" type="text" name="mobile_phone" id="mobile_phone" placeholder="mobile phone"/></td>
</tr>
</table>
<table width="290" border="0" cellpadding="0" cellspacing="0" style="margin-bottom:0px;">
<tr>
<td colspan="2" align="right"><input type="submit" class="search_submit" value="Save" id="phone_form_submit"></td>
</tr>
</table>
</form>
Here is my JS code :
$("#phone_form_submit").on('click', function(event){
event.preventDefault();
$.ajax({
type : 'post',
url : 'save_phone.php',
data : $("#phone_form").serialize(),
dataType : 'html',
success : function(result){
alert(result);
}
});
});
Thank You.
In firebug I see this :

Scroll to the top of a scrollable pop div atomaticaly using jquery

First thing first, I am having a popup div, which contains a form
Here's is my div
<div class="addnewrule" id="add_message_0">
<form method="post" action="" id="frmadd">
<input type="hidden" name="filter" value="1">
<input name="rule_id" type="hidden" value="0">
<table class="table-responsive" width="100%" border="0" cellspacing="0" cellpadding="10" id="" style="text-align:center; margin-top:0px;">
<tr>
<td colspan="2" align="left"><div id="display_msg_0"></div></td>
</tr>
<tr>
<td width="40%" align="left">Name:</td>
<td width="60%" align="left"><input class="input_field" name="rule_name" type="text"></td>
</tr>
<tr>
<td align="left">Type:</td>
<td align="center">
<input type="radio" name="rule_type" value="0" style="display:none;" />
<input type="radio" name="rule_type" value="1" checked="checked" style="display:none;" />
<div class="btn-group equal_btn">
<button id="block_click" class="btn btn-default" type="button" onclick="setRules(0);">Block Clicks</button>
<button id="filter_click" class="btn btn-default active" type="button" onclick="setRules(1);">Filter Clicks</button>
</div></td>
</tr>
<tr>
<td align="left">Rule Active:</td>
<td align="center">
<input type="radio" id="active_0" name="active" value="1" checked="checked" style="display:none;" />
<input type="radio" id="inactive_0" name="active" value="0" style="display:none;" />
<div class="btn-group">
<button type="button" id="status_enb_0" class="btn btn-default active_btn active" onclick="setruleStatus(0,1);">Enable</button>
<button type="button" id="status_dis_0" class="btn btn-default inactive_btn" onclick="setruleStatus(0,0);">Disable</button>
</div></td>
</tr>
<tr>
<td align="left">Campaign ID:</td>
<td align="left"><input class="input_field" name="camp_id" type="text" /></td>
</tr>
<tr>
<td align="left" id="rRange">Filter IP Ranges:</td>
<td align="left"><table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="padding:0;" width="45%"><input class="input_field" name="start_ip" type="text" /></td>
<td width="10%" align="center">To</td>
<td style="padding:0;" width="45%" align="right"><input class="input_field" name="end_ip" type="text" /></td>
</tr>
</table></td>
</tr>
<tr>
<td align="left" id="rUAs">Filter users agents that contains:</td>
<td align="left"><input class="input_field" name="user_agent" type="text" /></td>
</tr>
<tr>
<td align="left" id="rRefs">Filter referers that contains:</td>
<td align="left"><input class="input_field" name="referer" type="text" /></td>
</tr>
<tr id="rUrl" style="display:none;">
<td align="left">Send Blocked Clicks to:</td>
<td align="left"><input class="input_field" type="text" id="rule_url" name="rule_url" value="" /></td>
</tr>
<tr>
<td align="left" colspan="2"><table class="copypaste" width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>Apply <a href="javascript:void(0)" class="btn orange_button tab2" onclick="cancel_popup('add_new_rule')" >Cancel</a></td>
</tr>
</table></td>
</tr>
</table>
</form>
</div>
Now, here is the jquery ajax function given below.. It checks for the validation and displays the validation message in a message div...
function submitRule(frmId,rule_id)
{
var data=$('#'+frmId).serializeArray();
$.ajax({
type:'POST',
url:'ajax/rule_update_process.php',
data: data,
dataType:'json',
success:function(jData)
{
if(jData.status==1)
{
$("#display_msg_"+rule_id).html(jData.error);
$("#display_msg_"+rule_id).addClass('error');
var child_div = $("#display_msg_"+rule_id);
var parent_div = $("#add_message_"+rule_id);
parent_div.scrollTop(parent_div.scrollTop() + child_div.position().top);
}
else
{
window.location.href='settings_rules.php';
}
}
});
}
Since the popup is a scrollable div, i want to scroll(only within the popup div) to the top so that i can show the message div with the error message..
here'sw how i am getting the screens,.
I used this piece if code to scroll to the top of the popup div to show the error message div,
but this piece of code doesn't seem to work..
What am i doing wrong??
$("#display_msg_"+rule_id).html(jData.error);
$("#display_msg_"+rule_id).addClass('error');
var child_div = $("#display_msg_"+rule_id);
var parent_div = $("#add_message_"+rule_id);
parent_div.scrollTop(parent_div.scrollTop() + child_div.position().top);

replace ur last line of code with this
parent_div.scrollTop(0,0);

I will suggest a very simple apprach:
$("#apply_button").click(function () {
var error_message = $("#your_error_message").css("display");
if (error_message != "none") {
$("#add_message_0").scrollTop(0);
};
});
Code speaks for itself.
BR

You can use css only brother. Example this is your form.
<div>
<form class="has-error">
<p>error</p>
<input name="" value="">
</form>
<div>
you can use the class .has-error to set a css codes. your css codes will only use if the error message is displayed.
div{ overflow-y: scroll; }
div .has-error{ height: 400px; }
height will defend your current section height with errors message.
Something like this on fiddle demo
if the message is not visible on button click, add this to your click function code
$( '#add_message_1' ).delay( 200 ).animate({scrollTop: 0 }, 300);}

Unable to submit form from javascript function

I have a JSP file with struts tags.
<html:form action="showcart">
<table width="100%" border="1">
<tr>
<td width="46" align="center" valign="middle"></td>
<td width="110"></td>
<td width="31"> </td>
<td width="171" class="cart_contents"><span class="heading">Product</span></td>
<td width="157" class="cart_contents"><span class="heading">Quantity</span></td>
<td width="181" align="center" valign="middle" class="cart_contents"><span class="heading">Unit Price</span></td>
<td width="157" class="cart_contents"><span class="heading">Total Price</span></td>
<td width="222" align="center" valign="middle"></td>
</tr>
<%!
java.util.Map cartList = null;
%>
<%
cartList = (java.util.Map)request.getAttribute("cartList");
if (null != cartList) {
for(Object p : cartList.values()) {
com.pojo.Product product = (com.pojo.Product)p;
%>
<tr>
<td width="46" align="center" valign="middle"><input type="checkbox" name="checkbox" value="<%=product.getProductid()%>" /></td>
<td width="110"><img src="images/01.jpg" width="110" height="78" /></td>
<td width="31"> </td>
<td width="171"><span class="heading"><%=product.getProductname()%></span><br /><span class="contents">Serial number:<%=product.getProductid()%></span></td>
<td width="157" align="center" valign="middle" class="contents">
<label>
<input name="textfield2" type="text" value="3" size="5" align="center" onchange="submitForm()" />
</label>
<br /></td>
<td width="181" align="center" valign="middle" class="contents"><span class="price"><%=product.getUnitprice()%></span> </td>
<td width="157" class="cart_contents"><span class="heading">Total Price</span></td>
<td width="222" align="center" valign="middle"><span class="blue_contents">Remove</span></td>
</tr>
<%
}
}
%>
</table>
<html:submit/>
</html:form>
Whenever the user changes the quantity textfield, a the JS function, submitForm() is invoked. I am using an inline script as follows.
<script type="text/javascript">
function submitForm()
{
document.forms[0].action = "showcart.do?method=updateCart&pcount=2&product=2345";
document.forms[0].submit();
}
</script>
But, I am getting a JS error saying the form is undefined. Could you tell me where I am wrong?
Waiting for solutions!
Thanks in advance!

Your code worked perfectly fine for me. Make sure that the javascript code comes after the form. Also make sure there are no javascript errors in your brower's error console. If there are an code after the error will fail to run.