Created
March 5, 2017 09:12
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Simple HTML Timer to Demonstrate Javascript on a Browser
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| <html> | |
| <head> | |
| <style> | |
| p#secondsLeft { | |
| padding-top: 100px; | |
| text-align: center; | |
| font-size: 50px; | |
| } | |
| p.secondsLeftText { | |
| text-align: center; | |
| } | |
| </style> | |
| </head> | |
| <body id='body'> | |
| <h1>Josh's Timer</h1> | |
| <p id="secondsLeft">?</p> | |
| <p class="secondsLeftText">Seconds Left</p> | |
| <input type='text' name='seconds' id='secondsInput'> | |
| <input type='submit' onclick="startTimer();"> | |
| <script> | |
| //this function is called when secondsLeft reaches 0 at line #51 | |
| function changeBodyColor(){ | |
| var colors = ['red', 'orange', 'yellow', 'green', 'blue', 'violet', 'purple'] | |
| var bodyElement = document.getElementById('body') | |
| var colorIndex = 0 | |
| var bodyColorLoop = setInterval(function(){ | |
| bodyElement.style.backgroundColor = colors[colorIndex] | |
| colorIndex = colorIndex + 1 | |
| if (colorIndex == 6) { | |
| clearInterval(bodyColorLoop); | |
| } | |
| }, 500); | |
| } | |
| //This function is called when the submit button is pressed (see line #20) | |
| function startTimer() { | |
| var secondsLeftElement = document.getElementById('secondsLeft') | |
| var secondsLeft = document.getElementById('secondsInput').value | |
| var timerLoop = setInterval(function(){ | |
| secondsLeftElement.innerHTML = secondsLeft; | |
| secondsLeft = secondsLeft - 1 | |
| if (secondsLeft == -1) { | |
| changeBodyColor(); | |
| clearInterval(timerLoop); | |
| } | |
| }, 1000); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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