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Show/hide multiple fields based on drop down selection

I am using SharePoint Calendar and we are using multiple columns and it is 25 columns, in each time when we want to add new record, we have to skip a lot of columns. So using a dropdown list by showing or hiding multiple columns based on my selection would be a good idea.
What I did after discovering below code, I create a dropdown named Selection and applied the script code below but however it does not work based on my selection. I will be grateful if you guys could help me on this issue.
Thank you
<script src="/SiteAssets/jquery-3.3.1.js"></script>
<script src="/SiteAssets/sputility.js "></script>
<script>
$(document).change(function() {
var ddlValue = SPUtility.GetSPField('Selection').GetValue();
if (ddlValue == 'Country') {
SPUtility.ShowSPField('Country');
SPUtility.ShowSPField('Colour');
SPUtility.HideSPField('Animal');
SPUtility.HideSPField('Fruit');
}
if (ddlValue == 'Fruit') {
SPUtility.ShowSPField('Fruit');
SPUtility.ShowSPField('Colour');
SPUtility.HideSPField('Country');
SPUtility.HideSPField('Animal');
}
if (ddlValue == 'Animal') {
SPUtility.ShowSPField('Animal');
SPUtility.HideSPField('Country');
SPUtility.HideSPField('Fruit');
SPUtility.HideSPField('Colour');
}
if (ddlValue == 'Colour') {
SPUtility.ShowSPField('Colour');
SPUtility.ShowSPField('Animal');
SPUtility.HideSPField('Country');
SPUtility.HideSPField('Fruit');
}
});
</script>

First thing you need to do is create a change() function linked to your dropdown so that the function triggers every time you change the values. You can do that by doing this:
$("your selector for your dropdownfield").change(function() {
//your actions here
});
The next thing you need to do is get the value of the dropdown field then perform the hiding of the fields based from its value. To do that, you need to do the following:
var ddlValue = SPUtility.GetSPField('Selection').GetValue();
if (ddlValue == 'Test Value 1') {
//hide fields for 'Test Value 1'
}
So if we combine the two together you will end up with:
$("your selector for your dropdownfield").change(function() {
var ddlValue = SPUtility.GetSPField('Selection').GetValue();
if (ddlValue == 'Test Value 1') {
//hide fields for 'Test Value 1'
}
});
You can just add more if conditions within the change() function and you should now be able to hide/show fields based on the value of the dropdown.
Let me know if it works!

jQuery Validation based on Next Prev values

I have ran into this problem where I am specifying a Quanitity by both Units and Price. If Units is given, price must also be supplied and if price is given, Units must also be supplied. But they are both blank, then it is ok.
+----------+-------+
| Quantity | Units |
+----------+-------+
| | |
+----------+-------+
I have used the following code to check this condition and it does work for the first instance of the classes but not the proceeding ones.
$(".Quantity").rules("add",{
required:function(element){
return $(".Quantity").next('input').val() > 0;
},
});
$(".Units").rules("add",{
required:function(element){
return $(".Units").prev('input').val() > 0;
},
});
So basically it check only the first value of occurance and not the rest. What I want is it go through complete page and compare prev next value of each occurance. In my case, data is arranged in table and each cell contains Quantity and Price input boxes which I want to retrieve by prev next. but it is not working.
Here is codepen demo. Note that I am using bootstrap dialog as well in the example which shows total number of errors and again it stops at the first instances of the class, not showing all errors because I am using class based rules. Any help would be appreciated.

With this plugin's methods, when using a selector that targets more than one element, you must enclose the method within a jQuery .each()...
$(".Quantity").each(function() {
$(this).rules("add",{
required: function(element) {
return $(".Quantity").next('input').val() > 0;
},
});
});
Otherwise, when you don't use an each(), only the first matching element is considered.

Answering it myself. I had to use the following code to fix my issue
$('.Units').each(function () {
$(this).rules("add", {
onkeyup: false,
required: function (element) {
return element.nextElementSibling.nextElementSibling.value > 0 ? true : false;
},
})
});
$('.Cost').each(function () {
$(this).rules("add", {
required: function (element) {
return element.previousElementSibling.previousElementSibling.value > 0 ? true : false;
},
})
});
The actual code I used is more complicated where prev and next values were dependent on each other.

MVC 4 using jquery how to check if the model property has elements in it

I'm passing in a view model that works with the CheckBoxListFor property and I would like to hide the checkbox section if when I repost to the page there are no check marks ticked. I can show and hide the check box section with no problem using:
$('div.KSearch').hide();
or
$('div.KSearch').show();
What I've been trying to do is check the view model which has a List which hold the information for the keyword model. Is there anyway to check if this list has element being passed in within jquery so that I can show or hide the section with something like:
if (('#Model.SelectedKeywords').length) {
$('div.KSearch').show();
} else {
$('div.KSearch').hide();
}
but this always shows the section. Any ideas?

Something like this?
var len = #Model.SelectedKeywords.Count;
if (len > 0) {
$('div.KSearch').show();
} else {
$('div.KSearch').hide();
}
('#Model.SelectedKeywords').length is treated as a string length in javascript, and it's always positive (and true) ;)

Check MVC Model is null or not in jquery
<script type="text/javascript">
var checkBoxCount = #(Model.SelectedKeywords != null ? Model.SelectedKeywords.Count : 0);
if (checkBoxCount != 0) {
$('div.KSearch').show();
} else {
$('div.KSearch').hide();
}
</script>
I hope this will help.

jquery dropdownlist hide value if selected in second dropdown

Okay so I have two drop downs I want the selected item in dropdown one to be hidden in dropdown two and vice versa.
I have done the following so far can't seem to figure out the final step was hoping for a hand.
What I have currently is I have two lists that append to the dropdowns from and to, these list are looped over and append values to the dropdownlists, I then check for change event and when this occurs I remove values from a dropdown based on its index.
I am currently removing on selectedIndex, I want to remove on selectedValue rather then index but could not grasp that either.
<script type="text/javascript">
var fromCurrencies = {
FRO : 'Convert this currency',
AUD : 'AUD, Australian Dollar',
NZD : 'NZD, New Zealand Dollar',
EUR : 'EUR, Euro',
USD : 'USD, United States Dollar',
};
var toCurrencies = {
TOC : 'To this currency',
AUD : 'AUD, Australian Dollar',
NZD : 'NZD, New Zealand Dollar',
EUR : 'EUR, Euro',
USD : 'USD, United States Dollar',
};
$(document).ready(function () {
var ddFrom = $(".ddConvertFrom");
$.each(fromCurrencies, function (val, text) {
ddFrom.append(
$('<option></option>').val(val).html(text)
);
}); /*End ddFrom loop*/
var ddTo = $(".ddConvertTo");
$.each(toCurrencies, function (val, text) {
ddTo.append(
$('<option></option>').val(val).html(text)
);
}); /*End ddTo loop*/
}); /*End document.ready function*/
function doAction(){
if ($('.ddConvertFrom').val == "" || $('.ddConvertFrom').get(0).selectedIndex == 0) {
//Do nothing or hide...?
} else {
/*Hide selected value from other dropdown*/
var index = $('.ddConvertFrom').get(0).selectedIndex;
$('.ddConvertTo option:eq(' + index + ')').remove();
}
}
</script>
The html:
<div class="selectstyler">
<asp:DropDownList ID="ddConvertFrom" OnChange="doAction()" CssClass="ddConvertFrom" runat="server"></asp:DropDownList>
</div>
<div class="selectstyler">
<asp:DropDownList ID="ddConvertTo" CssClass="ddConvertTo" runat="server"></asp:DropDownList>
</div>

Purely for completeness to add to an already working answer from undefined.
To address the vice versa and the extended issue of re-adding those values including auto-selecting the previous value if it exists see: DEMO
See below for the changes I made to your original scripts.
I'm sure the code below can be optimised on several levels but I only tried to get it working first. Making it pretty I leave to you :)
To start I re-factored your code so the values are attached in their respective methods.
The dropdowns are now fully cleared before the values are re-added.
First though we record the value of the currently selected option to ensure we can re-select it if it exists. Adds a more dynamic feel to it and saves the user form re-selecting manually.
See example of attaching values to the from-dropdown:
function attachFromValues() {
var ddFrom = $(".ddConvertFrom");
var selectedValue = ddFrom.val();
var selectedIndex = 0;
ddFrom.html("");
var index = 0;
$.each(fromCurrencies, function(val, text) {
ddFrom.append(
$('<option></option>').val(val).text(text));
if (selectedValue == val) {
selectedIndex = index;
}
index++;
}); /*End ddFrom loop*/
if (selectedIndex > 0) {
ddFrom.get(0).selectedIndex = selectedIndex;
}
};
I also re-factored the code which removes the value in the other dropdown calling the new re-factored methods to re-attach all values first before removing the specific value. That makes sure you do not end up with an empty dropdown after while.
See example of the change event of the to-dropdown:
(taken from undefined's answer, only added call to re-populate)
$('select.ddConvertTo').change(function() {
if ($('.ddConvertTo').val == "") {
//Do nothing or hide...?
} else { /*Hide selected value from other dropdown*/
attachFromValues();
var txt = $(this).val();
$('.ddConvertFrom option[value=' + txt + ']').remove();
}
})
For the complete code changes check the linked DEMO
Edit (25-Jun-2012)
Updated code as I noticed an inconsistency whereby the currencies did not re-set correctly if the default selection (index 0) was made. The latest version of this code now re-binds the currencies correctly.

try this and instead of using onChange attribute you can use change event handler.
$('select:first').change(function(){
/*remove selected value from other dropdown*/
var txt = $(this).val();
$('.ddConvertTo option[value=' + txt + ']').remove();
})
http://jsfiddle.net/ue4Cm/1/

Show field if true, hide field if false?

Want to have a notification box displayed if amount in fieldA is higher than amount in fieldB.
Currently have some code working but the notification box toggles on and off not depending on the actual amount.
What am I missing?
jquery:
$(document).ready(function() {
$('#fieldA').change(function(){
if($(this).val()>$('#fieldb').val()){
//display it on the form
$('.labelNotification').toggle();
$('.labelNotification').append('Not recommended to have FieldA figure higher than FieldB.');
}
})
});
HTML:
< p style="display: none;" class="error labelNotification">

This is tailor-made for the toggle(boolean) method. Also, you have to be careful about appending to the notification label ... what if the user changes his answer twice? It's better to have multiple notification objects, each of which can contain stuff for a single type of notification.
$(function() {
$('#fieldA').change(function() {
var isLarger = +$(this).val() > +$('#fieldB').val(); // Note: convert to number with '+'
var $labelNotification = $('.labelNotification');
$labelNotification.toggle(isLarger);
if (isLarger) {
//display it on the form
$labelNotification.html('Not recommended to have FieldA figure higher than FieldB.');
}
})
});

If you're comparing numerical values (which it seems like you are), you should use parseInt or parseFloat to convert the (string) value returned by val() to an integer. According to the documentation for val, the function always returns a string value.

I found the problem ,
First thing is you need to have semicolon properly as below
$('#fieldA').change(function () {
if ($(this).val() > $('#fieldB').val()) {
alert("its greater");
//display it on the form
$('.labelNotification').append('Not recommended to have FieldA figure higher than FieldB.');
$('.labelNotification').show();
}
else {$('.labelNotification').hide();
$('.labelNotification').html('');}
});
Second thing , when you toggle it it won't show for the second time
if 40 > 30
and again if you entery 50 and 50 > 30 it won't show
this is second problem
final problem is empty the label all the time
$('.labelNotification').html('')'

Toggle is not the best approach for your situation.
You want to compare and then decide.
Since you are looking at numbers I would strongly suggest using a number type to do the comparison, either using parseInt() or parseFloat().
The text in the notification label only needs to be set once, since you don't have any comment for it showing something when B > A. I would suggest setting this in your HTML.
<span class="labelNotification" style="display:none">Your Warning Text</span>
<!-- if your CSS class has `display:none` remove the style attribute -->
as for the jQuery.
$(function() {
$("#fieldA").change(function() {
var a = parseInt($(this).val());
var b = parseInt($("#fieldb").val());
// handle if a or b is not a number --> isNaN(a) || isNaN(b)
if( a > b ) {
$('.labelNotification').show()
} else {
$('.labelNotification').hide()
}
});
});