Develop Reference

How to give a unique id for each cell when adding custom columns?

I wrote following code to add a custom column to my table. but i want to add a unique id to each cell in those columns. the format should be a(column no)(cell no>)
ex :- for the column no 4 :- a41, a42, a43, ........
So please can anyone tell me how to do that. Thank You!
$(document).ready(function ()
{
var myform = $('#myform'),
iter = 4;
$('#btnAddCol').click(function () {
myform.find('tr').each(function(){
var trow = $(this);
var colName = $("#txtText").val();
if (colName!="")
{
if(trow.index() === 0){
//trow.append('<td>'+iter+'</td>');
$(this).find('td').eq(5).after('<td>'+colName+iter+'</td>');
}else{
//trow.append('<td><input type="text" name="al'+iter+'"/></td>');
$(this).find('td').eq(5).after('<td><input type="text" id="a'+iter+'" name="a'+iter+'"/></td>');
}
}
});
iter += 1;
});
});

You seem to have code that's modifying the contents of the table (adding cells), which argues fairly strongly against adding an id to every cell, or at least one based on its row/column position, as you have to change them when you add cells to the table.
But if you really want to do that, after your modifications, run a nested loop and assign the ids using the indexes passed into each, overwriting any previous id they may have had:
myform.find("tr").each(function(row) {
$(this).find("td").each(function(col) {
this.id = "a" + row + col;
});
});
(Note that this assumes no nested tables.)

try this
if(trow.index() === 0){
//trow.append('<td>'+iter+'</td>');
$(this).find('td').eq(5).after('<td id="a'+column_no+cell_no+'">'+colName+iter+'</td>');
}else{
//trow.append('<td><input type="text" name="al'+iter+'"/></td>');
$(this).find('td').eq(5).after('<td id="a'+column_no+cell_no+'"><input type="text" id="a'+iter+'" name="a'+iter+'"/></td>');
}
you just have to define and iterate the column_no and cell_no variable

When all other cells are numbered consistently (for example using a data-attribute with value rXcX), you could use something like:
function addColumn(){
$('table tr').each(
function(i, row) {
var nwcell = $('<td>'), previdx;
$(row).append(nwcell);
previdx = nwcell.prev('td').attr('data-cellindex');
nwcell.attr('data-cellindex',
previdx.substr(0,previdx.indexOf('c')+1)
+ (+previdx.substr(-previdx.indexOf('c'))+1));
});
}
Worked out in this jsFiddle

performing sortable using JavaScript

i have a situation where i need to achieve this, in a table having n rows. if i click on a row in a table and then click on another row. the content in row of first click should go to content in row of second click and then each row should be shifted by on step backward or forward. this can be taken equivalent to JQUERY sortable.
Example:
|1|2|3|4| if i click on 1 and 4 then it should be |2|3|4|1|
how to record two clicks, and the contents of my rows are div elements containing many input elements. I thought of this idea and is this a good way to achieve sortable or is there a still better way, i want to do it using java script.
thanks in advance.

my script fucntion goes like this. I really should have thought for a little longer. i used flags here, i got two questions more, can i do that with out flags?, is there a better way?
<script>
var flag=0;
var id1;
var id2;
function Myfunction(id)
{
if(flag==0)
{
id1=id;
flag=1;
}
else
{
id2=id;
var x=document.getElementById(id1).innerHTML;
var num1=parseInt(id1);
var num2=parseInt(id2);
for(var i=num1;i<num2;i++)
{
var j=i.toString();
var k=(i+1).toString();
document.getElementById(j).innerHTML=document.getElementById(k).innerHTML;
}
document.getElementById(id2).innerHTML=x;
flag=0;
}
}
</script>

I made up a little http://jsfiddle.net/zxKeg/. Works with jQuery only, no additional plugins needed. Hope this will help you!
JS Code:
$(document).ready(function() {
var $table = $('table');
var $toCopy = null;
$table.on('click', 'tr', function() {
if($toCopy === null || $toCopy[0] == this) {
$toCopy = $(this);
}
else {
$toCopy.remove();
$(this).after($toCopy);
$toCopy = null;
}
});
});

Recursive IDs and duplicating form elements

I have the following fiddle:
http://jsfiddle.net/XpAk5/63/
The IDs increment appropriately. For the first instance. The issue is when I try to add a sport, while it duplicates, it doesn't duplicate correctly. The buttons to add are not creating themselves correctly. For instance, if I choose a sport, then fill in a position, and add another position, that's all fine (for the first instance). But when I click to add another sport, it shows 2 positions right away, and the buttons aren't duplicating correctly. I think the error is in my HTML, but not sure. Here is the JS I am using to duplicate the sport:
$('#addSport').click(function(){
//increment the value of our counter
$('#kpSport').val(Number($('#kpSport').val()) + 1);
//clone the first .item element
var newItem = $('div.kpSports').first().clone();
//recursively set our id, name, and for attributes properly
childRecursive(newItem,
// Remember, the recursive function expects to be able to pass in
// one parameter, the element.
function(e){
setCloneAttr(e, $('#kpSport').val());
});
// Clear the values recursively
childRecursive(newItem,
function(e){
clearCloneValues(e);
});
Hoping someone has an idea, perhaps I've just got my HTML elements in the wrong order? Thank you for your help! I'm hoping the fiddle is more helpful than just pasting a bunch of code here in the message.

The problem is in your clearCloneValues function. It doesn't differentiate between buttons and other for elements that you do want to clear.
Change it to:
// Sets an element's value to ''
function clearCloneValues(element){
if (element.attr('value') !== undefined && element.attr('type') !== 'button'){
element.val('');
}
}
As #PHPglue pointed out in the comments above, when new positions are added, they are incorrectly replicated (I'm assuming here) to the newly cloned for
There is a similar problem with the add years functionality.
A quick fix would be to initialize a variable with a clone of the original form fields:
var $template = $('div.kpSports').first().clone();
Then change your addSport handler to:
$('#addSport').click(function () {
//increment the value of our counter
$('#kpSport').val(Number($('#kpSport').val()) + 1);
//clone the first .item element
var newItem = $template.clone();
…
});
However, there are no event bindings for the new buttons, so that functionality is still missing for any new set of form elements.
Demo fiddle
Using even a simple, naive string based templates the code can be simplified greatly. Linked is an untested fiddle that shows how it might be done using this approach.
Demo fiddle
The code was simplified to the following:
function getClone(idx) {
var $retVal = $(templates.sport.replace(/\{\{1\}\}/g, idx));
$retVal.find('.jsPositions').append(getItemClone(idx, 0));
$retVal.find('.advtrain').append(getTrainingClone(idx, 0));
return $retVal;
}
function getItemClone(setIdx, itemIdx) {
var retVal = itemTemplate.replace(/\{\{1\}\}/g, setIdx).replace(/\{\{2\}\}/g, itemIdx);
return $(retVal);
}
function getTrainingClone(setIdx, trainingIdx) {
var retVal = trainingTemplate.replace(/\{\{1\}\}/g, setIdx).replace(/\{\{2\}\}/g, trainingIdx);
return $(retVal);
}
$('#kpSportPlayed').on('click', '.jsAddPosition', function() {
var $container = $(this).closest('.kpSports');
var containerIdx = $container.attr('data_idx');
var itemIdx = $container.find('.item').length;
$container.find('.jsPositions').append(getItemClone(containerIdx, itemIdx));
});
$('#kpSportPlayed').on('click', '.jsAddTraining', function() {
var $container = $(this).closest('.kpSports');
var containerIdx = $container.attr('data_idx');
var trainIdx = $container.find('.advtrain > div').length;
$container.find('.advtrain').append(getTrainingClone(containerIdx, trainIdx));
});
$('#addSport').click(function () {
var idx = $('.kpSports').length;
var newItem = getClone(idx);
newItem.appendTo($('#kpSportPlayed'));
});

JQuery DataTables How to get selected rows from table when we using paging?

For example I selected (checked) 2 rows from second page than go to first page and select 3 rows. I want get information from 5 selected rows when I stay at first page.
$('tr.row_selected') - not working
Thanks.
Upd.
I created handler somthing like this:
$('#example').find('tr td.sel-checkbox').live("click", function () {
/*code here*/
});
But right now when click event is hadle the row from table is hidding. I think it may be sorting or grouping operation of DataTables. Any idea what I must do with this?

When a checkbox gets selected, store the row information you want in a global object as a Key-Value pair
I don't remember specifically how i did it before but the syntax was something like
$('input[type=checkbox]').click(function()
{
var row = $(this).parent(); //this or something like it, you want the TR element, it's just a matter of how far up you need to go
var columns = row.children(); //these are the td elements
var id = columns[0].val(); //since these are TDs, you may need to go down another element to get to the actual value
if (!this.checked) //becomes checked (not sure may be the other way around, don't remember when this event will get fired)
{
var val1 = columns[1].val();
var val2 = columns[2].val();
myCheckValues[id] =[val1,val2]; //Add the data to your global object which should be declared on document ready
}
else delete myCheckValues[id];
});
When you submit, get the selected rows from your object:
for (var i = 0; i < myCheckValues.length; i++)
...
Sorry, haven't done JS in a long time so code as is might not work but you get the idea.

$('#example').find('tr td.sel-checkbox').live("click", function () {
var data = oTable.fnGetData(this);
// get key and data value from data object
var isSelected = $(this).hasClass('row_selected');
if(isSelected) {
myCheckValues[key] = value;
checkedCount++;
} else {
delete myCheckValues[key];
checkedCount--;
}
});
.....
On submit
if(checkedCount > 0) {
for(var ArrVal in myCheckValues) {
var values = myCheckValues[ArrVal]; // manipulate with checked rows values data
}
}

confusion in jquery parents selector with hasClass function

var allChecked = $('.inboxCheckbox:checked');
if(allChecked.length > 0){
var messageIds = new Array();
var parentRow = null;
allChecked.each(
function(){
parentRow = $(this).parents('tr');
if(!(parentRow.hasClass('gradeA'))){
parentRow.addClass('gradeA');
increaseUnreadMessage();
}
parentRow = null;
messageIds.push($(this).val());
}
);
}else{
showInsMessage('<b class="redTxt">Please Select At Least One Message</b>');
}
i have multiple rows with once checkbox in each row... i was trying to add class gradeA to each row if checkbox is checked.... i do not want to call addClass if it already has class gradeA.... when i select multiple rows then it adds class to only one row. does that mean
lets say i have three rows with checkbox in each row and i select each checkbox when i run
$(':checked').each(
$(this).parents('tr')
)does it select all the rows with checked boxes or only the specfic parent row.... my assuption was it only gives the specific parent row..... if it gives specific row then it should work .. but once i add a class to parent row and move to another row then parentRow.hasClass('gradeA') return true... i am confused now if it checks all the row with checkboxes then is there any way to select specific parent row......
Thanks for reading

Would be nice to see the markup, are there more tables nested?
However,
parentRow = $(this).closest('tr');
should be a better choice.

API says that .parents() method search through all ancestors of the elements.
.parent() travels only a single level up the DOM tree.
If your checkbox is a direct child (not a deep descendant) of 'tr' then you can try
parentRow = $(this).parent('tr');

Your code should work. I suspect that the problem is happening because your function increaseUnreadMessage() is throwing an error, which is causing the rest of the each() loop to be skipped.
But, to answer your specific question: yes, you can select all rows (<td>s) that contain checked checkboxes. Using jquery's :has selector, like this:
var allCheckedRows = $('tr:has(.inboxCheckbox:checked)');
from there, of course, you can just use addClass() to apply your classname to all of them:
allCheckedRows.addClass('gradeA');
of course, you've got other things going on in your each() loop, so you probably can't throw out the each() entirely. As I said above, your code works... but something like this might be cleaner, and easier to understand.
var messageIds = new Array();
var allCheckedRows = $('tr:has(.inboxCheckbox:checked)');
allCheckedRows.addClass('gradeA');
allCheckedRows.find('.inboxCheckbox').each( function() {
var cb = $(this);
increaseUnreadMessage();
messageIds.push( cb.val() );
});
if( messageIds.length === 0 ) {
showInsMessage('<b class="redTxt">Please Select At Least One Message</b>');
}

BTW, I think you can do it more jQuerish style :
var messageIds = [];
$('tr.youTrs').toggleClass('gradeA', function () {
var checkbox = $(this).find('.inboxCheckbox');
if (checkbox.is(':checked')){
messageIds.push(checkbox.val());
return true;
}
else{
showInsMessage('<b class="redTxt">Please Select At Least One Message</b>');
return false;
}
});