Change boolean field value with JS [closed]

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I have to add some field value on a form using JS/JQ. I could manage text, number and choice fields but I am stuck on Boolean ones:

$("input[title='Title Required Field']").val("Hey my dear");
$("textarea[title='Task Description']").val("Mary had a little lamb");
$("select[name='choicefieldname'").val("Choice#3");

Work fine, while

$("input[name='YesNotFieldName']").val(true);                               

does not work. Boolean fields have no "title" tag, So I have to use "name". I have also tried with "id" but it did not help.
Also I have tried giving value "1" but still does not work.
Where is the mistake? Thanks

Answer 1

Try using .prop to deal with boolean that is for supported attributes like selected/disabled/checked e.t.c

$('#element').prop('attribute', true);

from jQuery docs, (an example)

elem.checked returns true (Boolean) Will change with checkbox state

$(elem).prop("checked") returns true (Boolean) Will change with checkbox state

elem.getAttribute("checked") returns "checked" (String) Initial state of the checkbox; does not change

$(elem).attr("checked")(1.6) returns "checked" (String) Initial state of the checkbox; does not change

$(elem).attr("checked")(1.6.1+) returns "checked" (String) Will change with checkbox state

$(elem).attr("checked")(pre-1.6) returns true (Boolean) Changed with checkbox state