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Problem 4 solution. Uses jQuery for DOM manipulation.
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| <!DOCTYPE HTML> | |
| <html> | |
| <head> | |
| <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script> | |
| <script type="text/javascript" src="timer.js"></script> | |
| </head> | |
| <input id="seconds" type="text" value="0"> | |
| <div id="countdown"> | |
| <span class="days">0 days</span> | |
| <span class="hours">0 hours</span> | |
| <span class="minutes">0 minutes</span> | |
| <span class="seconds">0 seconds</span> | |
| <button class="start">START</button> | |
| <button class="stop">STOP</button> | |
| <button class="reset">RESET</button> | |
| </div> | |
| <div id="countup"> | |
| <span class="days">0 days</span> | |
| <span class="hours">0 hour</span> | |
| <span class="minutes">0 minutes</span> | |
| <span class="seconds">0 seconds</span> | |
| <button class="start">START</button> | |
| <button class="stop">STOP</button> | |
| <button class="reset">RESET</button> | |
| </div> | |
| </html> |
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| var UNITS = ["days","hours","minutes","seconds"]; | |
| var calculate_times = function(seconds){ | |
| var days = Math.floor(seconds / 86400); | |
| seconds %= 86400; | |
| var hours = Math.floor(seconds / 3600);; | |
| seconds %= 3600; | |
| var minutes = Math.floor(seconds / 60); | |
| seconds %= 60; | |
| return [days, hours, minutes, seconds]; | |
| } | |
| var is_int = function(value){ | |
| return (parseFloat(value) == parseInt(value)) && !isNaN(value) | |
| } | |
| var render_time = function($spans, time_values){ | |
| var display; | |
| $spans.each(function(i){ | |
| if(time_values[i] == 1) | |
| display = time_values[i] + ' ' + UNITS[i].slice(0,-1); | |
| else | |
| display = time_values[i] + ' ' + UNITS[i]; | |
| $(this).text(display); | |
| }); | |
| } | |
| var toggle_buttons = function(selector,state){ | |
| $(selector + '>button:not(:last-child').prop('disabled',!state); | |
| } | |
| $(function(){ | |
| var seconds_left = seconds_elapsed = max_seconds = 0; | |
| var down_interval, up_interval; | |
| var down_interval_off = up_interval_off = false; | |
| var $countdown_spans = $('#countdown > span'); | |
| var $countup_spans = $('#countup > span'); | |
| var countdown = function(){ | |
| render_time($countdown_spans, calculate_times(--seconds_left)); | |
| if(seconds_left === 0){ | |
| toggle_buttons('#countdown',false); | |
| return clearInterval(down_interval); | |
| } | |
| } | |
| var countup = function(){ | |
| render_time($countup_spans, calculate_times(++seconds_elapsed)); | |
| if(seconds_elapsed >= max_seconds){ | |
| toggle_buttons('#countup',false); | |
| return clearInterval(up_interval); | |
| } | |
| } | |
| $('#seconds').on("keyup",function(e){ | |
| clearInterval(down_interval); clearInterval(up_interval); | |
| up_interval_off = down_interval_off = true; | |
| var input = $(this).val(); | |
| if(!is_int(input) || input < 0) | |
| input = 0; | |
| down_interval_off = up_interval_off = true; | |
| max_seconds = seconds_left = input; | |
| seconds_elapsed = 0; | |
| render_time($countdown_spans, calculate_times(seconds_left)); | |
| render_time($countup_spans, calculate_times(seconds_elapsed)); | |
| toggle_buttons('#countup',true); | |
| toggle_buttons('#countdown',true); | |
| }); | |
| $('#countdown > .start').on("click",function(){ | |
| if(down_interval_off && max_seconds > 0){ | |
| down_interval = setInterval(countdown,1000); | |
| down_interval_off = false; | |
| } | |
| }); | |
| $('#countup > .start').on("click",function(){ | |
| if(up_interval_off && max_seconds > 0){ | |
| up_interval = setInterval(countup,1000); | |
| up_interval_off = false; | |
| } | |
| }); | |
| $('.stop').on("click",function(){ | |
| if($(this).parent().attr('id') == "countdown"){ | |
| clearInterval(down_interval); | |
| down_interval_off = true; | |
| } | |
| else { | |
| clearInterval(up_interval); | |
| up_interval_off = true; | |
| } | |
| }); | |
| $('#countdown > .reset').on("click",function(){ | |
| seconds_left = max_seconds; | |
| render_time($countdown_spans, calculate_times(seconds_left)); | |
| clearInterval(down_interval); | |
| down_interval_off = true; | |
| toggle_buttons('#countdown',true); | |
| }); | |
| $('#countup > .reset').on("click",function(){ | |
| seconds_elapsed = 0; | |
| render_time($countup_spans, calculate_times(seconds_elapsed)); | |
| clearInterval(up_interval); | |
| up_interval_off = true; | |
| toggle_buttons('#countup',true); | |
| }); | |
| }); |
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