Develop Reference

Select options disappearing when appending new option

I'm currently creating a interface to select an option from one select element on double click, and append it to another select element.
The issue I am coming across is when doing so, it is added and visible, however all other options disappear in the destination select, until I click on the option and then click off.
You can see this in action here: https://i.imgur.com/jSXoIAi.gifv
My current implementation is as follows:
$('body').on('dblclick', '#availableColumnsSelect > option', function (e) {
var option = $(this);
//Add option to destination
displayColumnsSelect.append($('<option>', { value: option.val(), text: option.val() }));
//Remove option from source
option.remove();
//Sort the select options
sortSelect("#displayColumnsSelect");
var optionsAvailable = $("#availableColumnsSelect > option:not([disabled])").length;
if (optionsAvailable == 0) {
$("#noSelectedText").removeClass('hidden');
}
$("#noSelectedText").addClass('hidden');
});
The underlying HTML is being constructed exactly how it should.
Any ideas?

As pointed out the issue was with the sortSelection function. I'm not quite sure why, but regardless I don't actually require this function anymore.
Removing said function has resolved the issue :)

jQuery - Get the value of unselected item in multiselect

Although this may sound dead simple, the matter is complicated by the fact I can only use the change() trigger on the select element. I am using the 'Chosen' jQuery plugin which basically modifies the multi select box on the page.
Whenever a item is selected or unselected, the plugin triggers the change event on the original select element. I am obviously able to get all the unselected items, but I need the one that was just unselected that caused the change event to trigger.
So I have the following function, the bit in the middle is what I need to capture the item that was just unselected. #cho is the id of the original select element.
$("#cho").chosen().change( function() {
// Need code here to capture what item was just unselected, if any...
})

Store value when the user changes the the check box.
var preVal;
$("input[name='g']").on("change",function(e){
if(preVal){
alert(preVal);
}
preVal=$(this).val();
});
Check this http://jsfiddle.net/fcpfm/

1.Use hidden field
2.Hidden field value initially empty.
3.Onchange put the selected value in a hidden field.
4.If onchange is happening again , hidden field value is the previously selected value.
$("#cho").chosen().change( function() {
var hidvalue = $('#hiddenfield').val();
if (hidvalue ) {
//Get the previously selected ids
var prev_ids = $('#hiddenfield').val();
//Then Update currently selected ids
$('#hiddenfield').val('currently selected ids');
} else {
//Update currently selected ids
$('#hiddenfield').val('currently selected ids');
}
})

Try using a variable to store the selected item. Update it each time when item changed. I cant add comment. That is why I am posting it as an answer.

jQuery UI checkboxes misbehaving when cloned

I'm trying to create a table of inputs that automatically adds a new row when you enter text in one of the inputs on the bottom line. For the most part, it works fine. However, I'm having some trouble with jQuery UI checkbox buttons.
The checkbox buttons are supposed to change their icon when clicked. This works fine for the original buttons, but the cloned button that appears when you add a new row doesn't work properly.
You can see it in jsfiddle here. To replicate the issue, put some text in the third input down. You'll see that a fourth row appears. If you press the fourth checkbox, you'll see the third checkbox is the one whose icon changes. The wrong button also gets ui-state-focus but doesn't actually get focus, which really baffles me, though the correct button does get ui-state-active and seems, as far as I can tell, to evaluate as having been checked properly.
To be clear, the two checkboxes do not have the same ID, and their labels are for the right checkbox - the createNewRow() function takes care of that. If you comment out the line that turns the checkboxes into jQuery UI checkboxes, you'll see everything works fine. If you console.log the value of $(this).attr('id') in the buttonSwitchCheck function, you'll see that it has the right ID there too - if you click the fourth button, it'll tell you that the id of $(this) is "test4", but it's "test3" (the third button) that gets the icon change.
I'm going mad staring at this and I'd appreciate any help people can give. Here's the code:
// Turns on and off an icon as the checkbox changes from checked to unchecked.
function buttonSwitchCheck() {
if ($(this).prop('checked') === true) {
$(this).button("option", "icons", {
primary: "ui-icon-circle-check"
});
} else {
$(this).button("option", "icons", {
primary: "ui-icon-circle-close"
});
}
}
// Add a new row at the bottom once the user starts filling out the bottom blank row.
function createNewRow() {
// Identify the row and clone it, including the bound events.
var row = $(this).closest("tr");
var table = row.closest("table");
var newRow = row.clone(true);
// Set all values (except for buttons) to blank for the new row.
newRow.find('.ssheet').not('.button').val('');
// Find elements that require an ID (mostly elements with labels like checkboxes) and increment the ID.
newRow.find('.ssheetRowId').each(function () {
var idArr = $(this).attr('id').match(/^(.*?)([0-9]*)$/);
var idNum = idArr[2] - 0 + 1;
var newId = idArr[1] + idNum;
$(this).attr('id', newId);
$(this).siblings('label.ssheetGetRowId').attr('for', newId);
});
// Add the row to the table.
newRow.appendTo(table);
// Remove the old row's ability to create a new row.
row.removeClass('ssheetNewRow');
row.find(".ssheet").unbind('change', createNewRow);
}
$(document).ready(function () {
// Activate jQuery UI checkboxes.
$(".checkButton").button().bind('change', buttonSwitchCheck).each(buttonSwitchCheck);
// When text is entered on the bottom row, add a new row.
$(".ssheetNewRow").find(".ssheet").not('.checkButton').bind('change', createNewRow);
});
EDIT: I was able to find a solution, which I'll share with the ages. Thanks to "Funky Dude" below, who inspired me to start thinking along the right track.
The trick is to destroy the jQuery UI button in the original row before the clone, then reinitializing it immediately afterwards for both the original row and the copy. You don't need to unbind and rebind the change event - it's just the jQuery UI buttons which have trouble. In the createNewRow function:
row.find('.checkButton').button('destroy');
var newRow = row.clone(true);
row.find('.checkButton').add(newRow.find('.checkButton')).button().each(buttonSwitchCheck);

Try using the newer method .on, that allows for delegation, which should help with the dynamic changes to your DOM:
$(".checkButton").button().each(buttonSwitchCheck);
$("table").on("change", ".checkButton", buttonSwitchCheck);
I'm not sure, but it might help with not having to worry about binding events to specific elements.
Also, you could use it for the textbox change event:
$("table").on("change", ".ssheetNewRow .ssheet:not(.checkButton)", createNewRow);
Here's your fiddle with my changes: http://jsfiddle.net/Cugb6/3/
It doesn't function any different, but to me, it's a little cleaner. I thought it would've fixed your problem, but obviously hasn't, due to problems with the button widget.
And funny enough, it doesn't seem they "support" cloning: http://bugs.jqueryui.com/ticket/7959

i think you are using deep clone, which also clones the event handler. in your create new row function, try unbinding the change event then rebind on the clone.

how to hide field in same row as field its dependent on

I'm pretty novice at jquery but I have a table with a field in each row that is dependent on another field (checkbox) in the row. Since its in a table I need to handle them in bulk. I don't think I'm using next() correctly but I'm trying to grab the next .subnet_mask since it will be the one in the same row as hide it. I'll also have to update it once I get that far so that it handles hiding and showing if the checkbox is checked or not.
$(function() {
$('.dhcp').each(function() {
$(this).click(function(){
$('.subnet_mask').next().hide();
});
});
});
Any help is appreciated!
EDIT: ok ok :) well the page is actually written in VisualForce (for salesforce). For simplicty sake lets say its just a form wrapped around a table (up to 20 rows representing different records) displaying a checkbox field with the class .dhcp and a field after it called .subnet_mask that should be shown/hidden based on the checkbox. Is that helpful?

I'd rather do this
$('.dhcp').on('click', function() {
$(this).nextAll('.subnet_mask').toggle();
});
Then you show/hide the next .submask (assuming one .submask per <tr>) each time you click the .dhcp

I'd suggest the following, though this suggestion may well change once I see the relevant HTML:
$('.dhcp').click(
function(){
$(this).closest('tr').find('.subnet_mask').hide();
});
This assumes that there will be only one .subnet_mask element per row (otherwise this will hide all of them) in response to the click event. You mention that this depends upon a checkbox, so perhaps the following would be better, using the change() method:
$('.dhcp').change(
function(){
var that = $(this);
if (that.is(':checked')) {
that.closest('tr').find('.subnet_mask').hide();
}
else {
that.closest('tr').find('.subnet_mask').show();
}
});
References:
change().
:checked selector.
click().
closest().
find().
hide().
is().
show().

You're using next incorrectly. It should be more like this:
$(function() {
$('.dhcp').each(function() {
$(this).click(function(){
$(this).next('.subnet_mask').hide();
});
});
});
For this case, I'm assuming that .dhcp and .subnet_mask are indeed siblings, wit the latter coming immediately after the former. Otherwise, .nextAll() can be substituted for .next()
Edited as per point below.

jQuery: How to reset multiple dropdowns after they have been cloned?

At the moment my code clones 3 dropdowns everytime you click the add button.
I managed to get it to copy the row exactly because before, the first dropdown would reset by itself but the other two would not so I was just wondering how to reset all 3 dropdowns?
It is easiest to see in this JSFiddle:
http://jsfiddle.net/jydqK/7/
So, if you change the first dropdown to agent and then click the + you will see the second row appears duplicated whereas I would like it to reset to tags, operands and values.
Any help greatly appreciated.

You can use removeAttr to remove selected attribute and then fire a change() event.
In your case:
dropdownclone.find('select.tags option:selected').removeAttr('selected');
dropdownclone.find('select.tags option:first').attr('selected','selected');
dropdownclone.find('select.tags').trigger('change');
Modified example: http://jsfiddle.net/ZF3mc/2/

If I understood your question, you want the duplicated row of selects to reset their values.
In this case you can just remove this:
dropdownclone.find('select').each(function(index, item) {
//set new select to value of old select
$(item).val( $dropdownSelects.eq(index).val() );
});
and replace it with:
dropdownclone.find('option').attr('selected', false);

Find all dropdowns in your clone. For each dropdown, check every option tags for a selected attribute and remove it. Something like this:
clone.find('select').each(function() {
$(this).find('option').each(function() {
$(this).removeAttr('selected');
});
});
Or better yet, find only the selected option tags using :selected filter before removing.