Validating if the check-box is checked

Question

I am using JQuery for validating if the check-box is checked or not. If Column-A has some value in it, and the check-box should get checked while saving.(I can keep the code in presave function).

Or if i can get an alert when this checkbox is not checked.

if($("select[title='Platform']").val()!=null) {
    alert("hi");
    $( '#Feature_x0020_Dependency_6c8e1e07-570a-418a-83c57cee7e963aed_$BooleanField' ).prop( "checked", true );
}

It shows syntax error for the ID that I have added for checkbox.

Answer 1

Try the following:

$('#Feature_x0020_Dependency_6c8e1e07-570a-418a-83c57cee7e963aed_$BooleanField').is(":checked")

UPDATE

Try $("[id$=_$BooleanField]").is(":checked") or $("[id$=_BooleanField]").is(":checked")

LEARNING

Please have a look at following for all jQuery selectors:
http://www.w3schools.com/jquery/jquery_ref_selectors.asp

We used id$ selector which means elements ending with id=value.. Following explains:
http://www.w3schools.com/jquery/sel_attribute_end_value.asp

Answer 2

This should as expected:

($("#tdLanguage").children().find('input:checkbox').is(':checked'))

where #tdLanguage is ID of the field. For more information, read this article: Accessing Checkbox in SharePoint using JQuery

Answer 3

It works fine with

$("[id$=_BooleanField]").is(":checked")

thanks