As someone just getting started with HTML5 canvas, I've figured out how to interact with users through keyboard and mouse inputs. But now I'm curious about how to check text input instead. For instance, if a user types "walk 20," I want an object to move up by 20 pixels. What's the most effective method for achieving this?
Check out this interactive example below. Simply input a number in the provided text field and hit enter to see the results. Give it a try at https://example.com
<!DOCTYPE html>
<html>
<head>
<script>
document.addEventListener('DOMContentLoaded',function(){
var canvas = document.getElementsByTagName("canvas")[0], input = document.getElementsByTagName("input")[0],
ctx = canvas.getContext('2d'), dy;
canvas.width =300, canvas.height =300, canvas.style.border ="1px solid black";
input.style.width = 300+"px", input.style.display="block";
var o ={
init: function(){
this.width = 10;
this.height = 10;
this.x = (canvas.width-this.width)/2;
this.y = canvas.height-this.height;
this.oy = this.y
}
}
o.init()
function draw(){
o.y-= 1
if(o.y>o.oy-dy){
ctx.clearRect(0,0,canvas.width,canvas.height)
ctx.fillRect(o.x,o.y,o.width,o.height)
window.requestAnimationFrame(draw)
}
else{
o.init()
window.setTimeout(function(){
ctx.clearRect(0,0,canvas.width,canvas.height)
ctx.fillRect(o.x,o.y,o.width,o.height)
},1000)
}
}
function moveUp(e){
if(e.keyCode === 13){
dy = parseFloat(input.value);
window.requestAnimationFrame(draw)
}
}
document.addEventListener('keydown',moveUp)
})
</script>
</head>
<body>
<div>
<canvas></canvas>
<input type ="text" placeholder ="Enter a number and press enter"> </input>
</div>
</body>
</html>
To utilize the input value within your function, you can simply access it like so:
document.getElementById('textFieldID').value
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