Develop Reference

.change() adds two values at the same time

Good day,
In my code, I need to use a drop-down list that has two values, say 1 and 2. When I click the #action-link link I append the corresponding text of the value into a textarea (#main-reply). I use Jquery .change() method to determine when selected value changed. Works ok unless I switch options several times and then it starts to add multiple values at a time even though I need insert in textarea only the corresponding value.
Here is a simple snippet of the code I use:
$("#action-link").click(function() {
if ($("#option").val() == 1) {
$("#main-reply").append("One");
}
});
$("#option").change(function() {
if ($(this).val() == 2) {
$("#action-link").click(function() {
$("#main-reply").append("Two");
});
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="option"><option value='1' selected>One</option><option value='2'>Two</option></select>
Add Value to textarea
<br>
<textarea id="main-reply"></textarea>
How can I solve this? Thanks!

Code adds another on-click listener when the value of the option was changed to '2' Link. Therefore the append() statament was being called multiple times, one from each listener.
$("#action-link").click(function() {
var option = $("#option").val();
if (option == 1) $("#main-reply").append("One");
else if(option == 2) $("#main-reply").append("Two");
});

Most of the times, this issue occurs when you load the same js file twice.
When JS file gets loaded twice, 2 on change events will get attached to the same event. Hence the actions will happen twice
Check your code and make sure that the JS file is not loaded twice
If it's not loaded twice and somehow this issue is still occurring, then use below code
$("#option").off().on("change",function() {
if ($(this).val() == 2) {
$("#action-link").click(function() {
$("#main-reply").append("Two");
});
}
});
This will remove any events attached to the change event and then adds the function

In your code click event is added on every change event for option value 2, which is not a good way as well.
You can write code as below
$("#action-link").click(function() {
if ($("#option").val() == 1) {
$("#main-reply").append("One");
} else if ($("#option").val() == 2) {
$("#main-reply").append("Two");
}
});
$("#option").change(function() {
// Just trigger click on change which handle other stuff
$("#action-link").trigger("click);
// You can write use below code as well.
// $("#action-link").click();
});
OR you can make it very simple as below which is dynamic regardless of any option value which will adds selected option value.
$("#action-link").click(function() {
appendOptionValue($("#option").val());
});
$("#option").change(function() {
appendOptionValue($("#option").val());
});
function appendOptionValue(optionValue){
$("#main-reply").append(optionValue);
}

this is it :
var val = $("#option").val();
$("#action-link").click(function() {
$("#main-reply").append(val);
});
$("#option").change(function() {
val = $(this).val();
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="option">
<option value='One' selected>One</option>
<option value='Two'>Two</option>
</select>
Add Value to textarea
<br>
<textarea id="main-reply"></textarea>

this might helpful to you. Use text() instead of append
$(document).ready(function(){
$('#action-link').click(function(event) {
if($('#option').val()==1){
$('#main-reply').text('one');
}else{
$('#main-reply').text('two');
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="option"><option value='1' selected>One</option><option value='2'>Two</option></select>
Add Value to textarea
<br>
<textarea id="main-reply"></textarea>

Disable a particular span using jQuery

I am creating a calendar event app where you can save people's birthday dates and edit people's names or dates whenever you want.
To display stored events I am using a forEach loop in JSP. I have a span named ld-option-okay-edit in each div. You can edit previous data after you click on that span and save your data.
But before clicking on the save button I am checking whether any field in a particular div is empty or not, using a jQuery hover function.
If any field is empty then I am disabling the span element so that it can't forward request to the servlet, but the problem is I am not able to disable it.
??????
THE PROBLEM
???????
My question is how can I disable a span through jQuery, or how can I prevent the onclick event of a span using jQuery?
Here is my code:
<c:forEach items="${relativeUser}" var="user">
<div class="elementsdiv">
<form action="<c:url value=" ******">" method="post">
<div class="cld-option-okay" >
<span class="glyphicon glyphicon-ok cld-option-okay-edit" name="cld-option-okay-edit" ></span>
</div>
<div class="cld-option-name" >
<input class="cld-name-input" value="${user.name}" placeholder="Name of the person" type="text" name="name">
</div>
</form>
</div>
</c:forEach>
What I have tried until now in jQuery is:
$(".elementsdiv").each(function (i, data) {
$($(data).find('.cld-option-okay')).hover(function (e) {
e.preventDefault();
if ($($(data).find('input[name="name"]')).val() === "") {
$($(data).find('span[name="cld-option-okay-edit"]')).addClass('disabled');//in this line i am getting trouble
}
}
});
For that line I even tried:
1)$($(data).find('span[name="cld-option-okay-edit"]')).attr("disabled","true");//with single quote also
2)$($(data).find('span[name="cld-option-okay-edit"]')).attr("disabled","disabled");//with single quote also
3).prop("disabled", true );
4).attr('disabled', '');
5).attr("disabled", "disabled");
6).off( "click", "**" );
7).unbind( "click", handler );
but when I apply:
`$($(data).find('span[name="cld-option-okay-edit"]')).hide()`;//it is applying
**********************
`$($(data).find('span[name="cld-option-okay-edit"]'))`till here code is working fine my problem is in applying disable.
previously i applied disable like below
$('.cld-option-okay-edit').addClass('disabled');
but it disables okay span in all divs
*************************

For enable or disable a span, you could do it like this:
var isEmpty = false;
$('#myDiv > input').keyup(function(){
isEmpty = false;
$('#myDiv > input').each(function(i,obj){
if(this.value == ""){
isEmpty = true;
return false;
}
});
// Styles for the span.
if( ! isEmpty){
$('#myDiv > span').removeClass('disabled');
} else {
$('#myDiv > span').addClass('disabled');
}
});
$('#myDiv > span').click(function(){
if(isEmpty){
alert("disabled");
} else {
alert("enabled");
}
});

I think this is what your code should look like based on what you have written, but I am not sure it is actually what you want to happen. If you want to disable it, you need to use prop()
$(".elementsdiv").each(function() {
var elem = $(this);
elem.find('.cld-option-okay').hover(function(e) {
if (elem.find('input[name="name"]').val() === "") {
elem.find('span[name="cld-option-okay-edit"]').addClass('disabled'); /*.prop("disabled",true); */
}
});
});

jquery click event to swap text not firing on first click but works after

I'm new to javascript and jquery, and I have this little bit of code to swap one bit of text for another that works perfectly except for the very first time you click the div.
Any ideas? I'm probably just calling on it wrong but not sure how to proceed
Here's a fiddle: http://jsfiddle.net/pauljackson/4r8v6/
js:
$(document).ready(function() {
$("#showemail").click(function() {
var $self = $(this);
if ($self.text() == "Contact")
$self.text("someguy#theinternet.com");
else
$self.text("Contact");
});
});
html:
<div id="showemail">
Contact
</div>
css:
#showemail:hover {
cursor:pointer;
}
Thanks!

Your text has some whitespace originally, trim it:
if ($self.text().trim() == "Contact")
The reason it works the second click is because your else condition sets the text to "Contact" without whitespace - then the next time you click your condition evaluates to true and all is well
Fiddle: http://jsfiddle.net/4r8v6/3/

Heres an update. Note the trim. It seems there is some additional text in the #showemail div that needs to be trimmed.
$(document).ready(function() {
$("#showemail").click(function() {
var $self = $(this);
console.log($self.text());
if ($self.text().trim() == "Contact") {
$self.text("someguy#theinternet.com");
}
else {
$self.text("Contact");
}
});
});

Using Jquery to show and hide elements based on an input

I have been trying to create a form which changes depending on the users entry. So far I have been successful in using a radio input to change which content is to be shown, but I am having trouble editing the JS to work with a drop down menu.
HTML
<div class="show-and-hide-content">
<select>
<option></option>
<option data-type="true">true</option>
<option data-type="false">false</option>
</select>
<div class="hidden content content-true">You have selected true.</div>
<div class="hidden content content-false">You have selected false.</div>
</div>
CSS
.hidden {
display:none;
}
Javascript
$(function () {
$('.show-and-hide-content').each(function (i) {
var $row = $(this);
var $selects = $row.find('select');
$selects.on('change', function () {
var type = $(this).attr('data-type');
$row
.find('.content').hide()
.filter('.content-' + type)
.show();
});
});
});
Working radio button JSFiddle
Non working drop down JSFiddle
I know that the JQuery is finding the right elements and is changing the display of them, but it never changes the display to make them visible. I think the problem may be that the JS isn't correctly getting the data-type variable from the option's.
I want the JQuery to work as intended and show the correct divs based on the users selection.
How can I amend the code to do this? Thanks for helping.

You now got:
var type = $(this).attr('data-type');
Since the function is called on the <select>, you select the data-type attribute of the <select> (which is defined), and not from the <option>.
So, you'll need to find the selected <option>:
var type = $(this).find('option:selected').attr('data-type');
Check the updated Fiddle.
[EDIT]
If you want to simplify your code, you could use this:
$(function () {
$('.show-and-hide-content select').on('change', function() {
$(this).parent().
find('.content').hide()
.filter('.content-' + $(this).find('option:selected').attr('data-type') ).show();
});
});
Demo.

Or change your select data-type to value and use
var type = $(this).val();
DEMO

Try this one
$(function () {
$('#select').on('change', function () {
var selctedval = $(this).val();
$('.content').hide();
$('.content-' + selctedval).show();
});
});

This will use whatever value you have in the "data-type" attribute and match it to the "content-" class that you have on the message. If there is no matching message then, no message will show.
$('.show-and-hide-content select').on('change', function(){
var selected = $(this).find('option:selected').data('type');
$('.content').addClass('hidden');
$('.content-' + selected).removeClass('hidden');
});
Here is a fiddle

Jquery: Hide a link button based on contains in option

EDIT: Will be more specific with requirements see bottom for additions:
I am trying to hide an a link (button formatted as a href), however I am trying to do it based on text found with in an option drop down menu.
So for example
<form id="phonetypeform">
<select name="porting-p1" class="dropdown">
<option value="">Please select an option...</option>
<option value="1">I want to keep my current phone number</option>
<option value="2">I want to choose a new number</option>
</select>
</form>
Next Step
If the 'please select an option' is selected it hides the a link, if anything else is selected then it shows the link
here is the jquery I have which is not working
$(document).ready(function() {
$("a.nextbutton").hide()
$('.dropdown').change(function() {
if($('.dropdown option:contains'Please)') {
$('a.nextbutton',this).hide();
} else {
$("a.nextbutton")show();
}
});
});
EDIT starts here:
thanks to everyone that has given me some answers, but what I now have works, but its not ideal, and ideally would like to use the contains, simple reason is I have about 20 of these scripts I would have to create and target the value, ugly!
to show my exact requirement please see the fiddle, while this is working, as I said I have many of these scripts to put in place, ideally I would like to:
1. target the text 'select...'
2. Have it so that it stays hidden until all options no longer contain 'Select...' (the contains should take care of that right)
Here is a fiddle to make life easier for anyone that can help?
http://jsfiddle.net/p3ewE/
END EDIT

Try this instead:
$("a.nextbutton").hide();
$('.dropdown').change(function () {
if ($('.dropdown').val() == "") {
$('a.nextbutton', this).hide();
} else {
$("a.nextbutton").show();
}
});
jsFiddle example
You had a few syntax issues with missing periods and brackets.

Typo here
if($('.dropdown option:contains(Please)')
^ ^
:contains()
Use this code
DEMO
$('.dropdown').change(function () {
if (this.value == "") {
$('a.nextbutton').hide();
} else {
$("a.nextbutton").show();
}
}).change();

Here is the link http://jsfiddle.net/XXDwr/5/
have a look at it.
$(document).ready(function() {
$(".nextbutton").hide();
$('.dropdown').on('change',function() {
var h= $('.dropdown').val();
if(h=="")
{
$(".nextbutton").hide();
}
else{
$(".nextbutton").show();
}
});
});
I hope you wanted to achieve this.

$(document).ready(function() {
var btnNext = $("a.nextbutton").hide();
$('.dropdown').change(function() {
if(this.value){
btnNext.show();
} else {
btnNext.hide();
}
});
});
You had a typo right before "please".
You could/should save the button in a variable so you don't have to make that query every time.