[英]Canvas height to fit content
我問了一個類似的問題,雖然假裝沒有回答我的問題,但它被標記為一個騙局。
編輯:騙局是[stackoverflow.com/questions/17211920/make-canvas-height-auto] [1]
我正在使用畫布來打印熱敏收據,您可能會想到收據的高度可能會有所不同,具體取決於收據上的物品數量。
因此我需要畫布來調整內容。
我知道canvas.height = window.innerHeight
和類似但我不知道這對我有什么幫助。
HTML
<body onload='onDrawReceipt(shipment, returns, company, customer, img)'>
<form onsubmit='return false;'>
<table id= "thermal-receipt-table" style='width:100%;'>
<tbody>
<tr >
<td colspan='2' class='left'>
<div id='canvasFrame'>
<canvas id='canvasPaper' width='576' height= '640' >
</canvas>
</div>
</td>
</tr>
</tbody>
</table>
</form>
JS
function onDrawReceipt(order, returns, company, customer, img) {
var canvas = document.getElementById('canvasPaper');
if (canvas.getContext) {
var context = canvas.getContext('2d');
context.clearRect(0, 0, canvas.width, canvas.height);
context.textBaseline = 'top';
lineSpace = 20;
leftPosition = 0;
//centerPosition = canvas.width / 2;
centerPosition = (canvas.width + 26) / 2;
//rightPosition = canvas.width;
rightPosition = (canvas.width - 0);
// cursor = 0;
cursor = 80;
//rest of code taking content to more than 640px in height.
}
您可以依賴contentContainerNode.offsetHeight
var canvas = document.getElementById('canvasPaper')
var contentContainerNode = document.getElementById('myContentContainer')
canvas.height = contentContainerNode.offsetHeight
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