Develop Reference

Hide buttons related to empty textareas (selecting issue)

I'm struggling with a jQuery selection: I have a table that contains these columns (more or less)
Name (input field)
Surname (input field)
Note (textarea)
Button (a button to submit the relative note)
I would like to hide all buttons whose textarea is empty (to avoid the submission). This is the table:
The DOM structure of the single row is quite simple (I think):
So, I would like to select something like "all buttons contained in a td that is a brother of a td that cointains an empty textarea"...anf anf...can I do that with a single jQuery selection or not? Thank you in advance.

Of course!
$("tr td textarea").each(function() {
if (this.value == "") {
$(this).closest("td").next("td").find("button").prop("disabled", true);
}
});

You could hide buttons onLoad with the next selector:
$('textarea:empty').parent().next('td').find('button').hide();
Or if you want to disable the buttons:
$('textarea:empty').parent().next('td').find('button').prop("disabled", true);
It would be useful to check if user has type something in the textarea while on the page, and enable or not the button:
$( $('textarea') ).blur(function() {
var button = $(this).parent().next('td').find('button');
if($(this).val() === ''){
button.prop("disabled", true);
}else{
button.prop("disabled", false);
}
});
You can check this fiddle with your table included:
http://jsfiddle.net/6B9XA/4/

try this
$('table textarea').change(function()
{
var thisval=$.trim($(this).html())
if(thisval=='')
{
$(this).parent().next().children('button').attr('disabled')
}
})

I think you should use it this way:
$("#yourtableid").find("textarea").each(function() {
if (this.value == "") {
$(this).closest("tr").find("button").prop("disabled", true);
}
});
"#yourtableid" this should be changed to your table id.
Selectors optimization for performance boost.

You can use filter() to get only the buttons who contains an empty textarea within that row
$('tr button').filter(function(){ // get all buttons
return $(this).closest('tr').find('textarea').val() == ''; // only return those that are empty
}).prop('disabled',true); // disable the buttons

Move options between two multi-select fields

I'm trying to do something like this answer: https://stackoverflow.com/a/6256910/1641189
However I want to do it with multi-select fields since they provide scroll bars.
Instead of having each item move as soon as it's clicked, like the answer link above, I am going to have two buttons between the two select fields.
Something like this: http://www.kj4ohh.com/stuff/selectfields.png
How would I do this in javascript/jquery?
How would I return the contents of both select fields back to my flask application?
EDIT:
I had tried the following javascript:
function assign(form)
{
for(i=0;i<form.unassigned.length;i++) {
if (form.unassigned.options[i].selected == true) {
form.assigned.add(form.unassigned.options[i]);
form.unassigned.remove(i);
}
}
//unselect all items
form.assigned.selectedIndex = -1
}
function unassign(form)
{
for(i=0;i<form.assigned.length;i++) {
if (form.assigned.options[i].selected == true) {
form.unassigned.add(form.assigned.options[i]);
form.assigned.remove(i);
}
}
//unselect all items
form.unassigned.selectedIndex = -1
}
but with strange results:
With this script, if you select an item from either select field and hit the appropriate assign/unassign button it works corectly.
If you select two items, only one is moved.
If you select more than two, one is moved, one stays put and the rest vanish.
However if I add an alert() line outputting the current selection being observed, it will produce an alert box for each item selected correctly.

You have to use jquery plugin for better result
http://loudev.com/

You may try this
​$(function(){
$('#toSel1, #toSel2').on('click', function(){
if($(this).attr('id')=='toSel2')
{
var l=$('#sel1 option:selected').length;
if(!l) {
alert("Option not selected !");
return false;
}
$('#sel1 option:selected').each(function(){
$('#sel2').append($(this));
});
}
else
{
var l=$('#sel2 option:selected').length;
if(!l) {
alert("Option not selected !");
return false;
}
$('#sel2 option:selected').each(function(){
$('#sel1').append($(this));
});
}
});
});​
DEMO.

How to select other checkbox when the last value is checked

Here an example of my checkbox list http://jsfiddle.net/YnM2f/
Let's say I check on G then A,B,C,D,E,F also automatic checked. How can i achieve my goals with jQuery?

First you need to get all the checkboxes based on which one is clicked. for this you need to get the parent nodes, siblings that are before it. Here is some code that will help you get there, but you'll need to work on it to make it work for you.
http://jsfiddle.net/urau8/
$("input:checkbox").on("click",function(){
if(this.checked)
$(this).parent().prevAll().each(function(){
$("input:checkbox",this).attr("checked",true);
});
});

This will check all checkboxes above a checkboxe that gets checked and uncheck all checkboxes above a checkbox that gets unchecked, given the checkbox layout that you've provided.
$('input:checkbox').click(function () {
var state = $(this).prop('checked');
var elements;
if (state) {
elements = $(this).parent().prevAll();
} else {
elements = $(this).parent().nextAll();
}
elements.each(function () {
$('input:checkbox', this).prop('checked',state);
});
});

$('input:checkbox').change(function(){
var $allParents = $(this).parent();
$allParents.prevAll().find('input').attr('checked', 'checked');
$allParents.nextAll().find('input').removeAttr('checked');
});
Try this

Well it's already been done five times, but this is what I did: http://jsfiddle.net/YnM2f/27/
$('input').click(function(){
if( $(this).is(':checked') ){
$(this).parent('p').prevAll().children('input').attr('checked',true)
}
})

Try something like this: http://jsfiddle.net/YnM2f/16/
It's a very specific solution (as in it will only work with "G"), but it should give you an idea for how to customize this code to meet your needs.
$('input:checkbox').filter(function(){
return (/ G/).test($(this).parent().text())
}).on('change', function() {
var gBox = $(this);
$('input:checkbox').prop('checked', $(gBox).prop('checked'));
});

jQuery check all not working on checkboxes

I'm writing some code that will allow the following:
1.) If a user checks a checkbox it will change the parent <tr> to have a class of selected (this can also be unchecked and remove the class)
2.) Any checkboxes that are already checked will have the class added on document load
3.) If a user checks the #checkall input then all inputs will become checked and add the class of selected (if checked again then it will unselect all and remove the class)
This is the code I have so far:
$("table input[name=choose]:checked").each(function()
{
$(this).closest("tr").addClass("selected");
});
$("table input[name=choose]").live("change", function()
{
$(this).closest("tr").toggleClass("selected");
});
if ($('#checkall:checked') == true)
{
$('#checkall').live("click", function()
{
$('table input[name=choose]').attr('checked', false);
$('table input[name=choose]').closest("tr").toggleClass("selected");
});
}
else
{
$('#checkall').live("click", function()
{
$('table input[name=choose]').attr('checked', true);
$('table input[name=choose]').closest("tr").toggleClass("selected");
});
}
The first two work fine but number 3 doesn't uncheck the checkboxes... Any ideas why? But the class part works fine??
Thanks

I guess it runs always into the else block (have you debugged this)?
Try writing this for checking if the checkbox is checked:
if ($('#checkall').attr('checked'))

Because if ($('#checkall:checked') == true) is always false..
either use
if ($('#checkall').is(':checked'))
or
if ( $('#checkall:checked').length )
Update after comment
Replace the entire third part (all the if/else) with
$('#checkall').live("change", function()
{
$('table input[name=choose]')
.attr('checked', this.checked)
.closest("tr")
.toggleClass("selected", this.checked);
});
demo at http://jsfiddle.net/gaby/KqwsZ/1/

Show a div if check box is checked and vice-versa

I'm trying to find the value of a check box and then if it is checked it should show my div id as resizeable. If its not checked it should disappear. This is what I tried:
var showheader = document.getElementById("ckbx_header").checked;
if ( showheader == checked ) {
$("#resizeable").toggle("slide", {}, 1000) );
};

You can bind an event handler to the change event:
$('#ckbx_header').change(function() {
if(this.checked) {
$("#resizeable").slideDown(1000);
}
else {
$("#resizeable").slideUp(1000);
}
});
In any case you need two actions: Show the div when the checkbox is selected and hide it if not. Currently you are toggling the visibility whenever the checkbox is selected, which is not what you want.

If you're really trying to do what you say you are, do this:
if($('#ckbx_header').prop('checked'))
$("#resizeable").toggle("slide", 1000);
Otherwise, look at Felix Kling's answer

You dont need the extra check in the if, the checked value returns a boolean.
This would work:
var showheader = document.getElementById('test').checked;
if(showheader)
$("#resizeable").toggle("slide",{},1000)

If you have jQuery, you should use it fully imo and do:
if ($("#ckbx_header:checked").length) {
$("#resizeable").toggle("slide", {}, 1000) );
};
The :checked selector will only match if the element is a checked checkbox.