[Solved] why my jquery code is not working?

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Try with following code:

<script>

        $(document).ready(function(){
           $("[id^=tolevel_]").click(function(){
                var currentID = $(this).attr("id");
                var number = currentID.replace("tolevel_","");//get the number in string format
                number = parseInt(number);
                var i = number -1;
                $("#level_" + i).hide(500,'swing', function(){
                  $("#level_" +(i+1)).show(500, 'swing', function(){

                  });
                });
           });

            $("[id^=backtolevel_]").click(function(){
                var currentID = $(this).attr("id");
                var number = currentID.replace("backtolevel_","");//get the number in string format
                number = parseInt(number);
                var i = number + 1;
                $("#level_" + i).hide(500,'swing', function(){
                    $("#level_" +(i-1)).show(500, 'swing', function(){

                    });
                });
            });
        });
    </script>

It user `jquery’s Attribute Starts With Selector. See more about it at https://api.jquery.com/attribute-starts-with-selector/. Really no need to write code for each and every element. This should work.

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solved why my jquery code is not working?