I am trying to display a text on a canvas by entering a message in a textbox but it's not appearing.
Here is my code:
<html>
<body>
<canvas id="myCanvas" width="600" height="400"></canvas>
<input type="text" name="fname" size="50" id="form_val">
<button onclick="clicked()">Submit</button>
<script type="text/javascript">
function clicked () {
var x = document.getElementById("form_val");
return x.value;
}
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.font = "25px Verdana";
ctx.fillText(clicked(), 250, 250);
</script>
</body>
</html>
I am trying to display a text on a canvas by entering a message in a textbox but it's not appearing.
Here is my code:
<html>
<body>
<canvas id="myCanvas" width="600" height="400"></canvas>
<input type="text" name="fname" size="50" id="form_val">
<button onclick="clicked()">Submit</button>
<script type="text/javascript">
function clicked () {
var x = document.getElementById("form_val");
return x.value;
}
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.font = "25px Verdana";
ctx.fillText(clicked(), 250, 250);
</script>
</body>
</html>
3 Answers
Reset to default 6The code outside of your function is triggered immediately, put it inside the function so it's called when it needs to be (as it currently stands, it calls nothing. And when you click the button, it's returning the input value to the onclick method. Try this instead:
function clicked(){
var x=document.getElementById("form_val");
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.font="25px Verdana";
ctx.fillText(x.value,250,250);
}
HTML:
<canvas id="myCanvas" width="600" height="400"></canvas>
<input type="text" name="fname" size="50" id="form_val">
<button id='submit'>Submit</button>
JavaScript:
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.font="25px Verdana";
document.getElementById('submit').addEventListener('click', clicked);
function clicked(){
var x=document.getElementById("form_val");
// Create the text when the button is clicked
ctx.fillText(x.value,250,250);
}
Fiddle.
I believe you want to do something like this
<script type="text/javascript">
function clicked(){
var x=document.getElementById("form_val");
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.font="25px Verdana";
ctx.fillText(x.value,250,250);
}
With this, the text will be filled when clicking the button. Note: I haven't tested the code, but you might get the picture
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