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javascript - jquery select class inside parent div

I'm trying to change the alt of the image, I'm clicking by selecting the image's class (add_answer)

Note: .add_answer shows up multiple times inside different containing div's

jQuery(function(){   // Add Answer

    jQuery(".add_answer").click(function(){
        var count = $(this).attr("alt");
        count++;
        $('.a_type_'+count+'').show();
        $(this).parents("div:first").$('.add_answer').attr("alt", count);
    }); 

});

This line doesn't seem to be working, how do I select this add_answer class by way of it's parent div

$(this).parents("div:first").$('.add_answer').attr("alt", count);

Anyone else have an idea?

I'm trying having trouble decreasing the alt value on the .add_answer image when .destroy_answer is clicked

jQuery(function(){   // Hide Answer

    jQuery(".destroy_answer").click(function(){
        $(this).parents("div:first").hide();
        var count = $('.add_answer').attr("alt");
        count--;
        $('.add_answer',$(this).parent('div:first')).attr('alt',count);


    }); 

});

Problem line:

$('.add_answer',$(this).parent('div:first')).attr('alt',count);
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by (71.8m points)

you can use the parent div as the scope:

 $('.add_answer',$(this).parent('div:first')).attr('alt',count);

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