Click td, select radio button in jQuery

Use this selector:

$('input:radio', this).attr('checked', true);

Or using find method:

$(this).find('input:radio').attr('checked', true);

Here is how your code should look like:

$("td").click(function () {
   $(this).find('input:radio').attr('checked', true);
});

Try

$(this).find('input:radio').attr('checked','checked');

Try find instead of closest.

$(this).find('input:radio').attr('checked',true);

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