jquery attr('checked','checked') works only once

Question

I have a problem finding reason for the following jquery/checkbox behaviour.

$( this.obj + ' table.sgrid-content > thead > tr > th > input.select_all' ).on( 'click' , {grid:this} , function(event){

var grid = event.data.grid;

if( $(this).is(':checked') ){

    $( grid.obj + ' table.sgrid-content > tbody > tr > td > input.select ' ).attr('checked','checked');
    $( grid.obj + ' .sgrid-content > tbody > tr > td > input.select ' ).parents('tr').addClass('ui-state-highlight');

} else {

    $( grid.obj + ' table.sgrid-content > tbody > tr > td > input.select ' ).removeAttr('checked');
    $( grid.obj + ' table.sgrid-content > tbody > tr > td > input.select ' ).parents('tr').removeClass('ui-state-highlight');

}

});

The code is intended to work as follows: - click on input.select_all triggers the event - if input.select_all is checked: add attribute checked to all checkboxes marked as .select within table.sgrid-content - if not: remove the 'checked' attribute from all input.select items.

Yet another simple grid function. And it works. The weird part is, it works only once. By that I mean, you can select all the checkboxes and deselect them. After that operation "Select all" function stops working.

Another weird thing is, when i check dom elements with firebug they all become checked='checked' attr as they should, but they display and behave as they were not checked.

Selectors work as they should. The code part with adding/removing ui-state-highlight works all the time.

Word of explenation: grid - is the object that I pass to get grid.obj ( basically ID of a ceratain div )

Please give me your opinion.

Answer 1

Use prop('checked', true / false) instead of removeAttr

$('input[name=foo]').prop('checked', true);
$('input[name=foo]').prop('checked', false);