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save PNG chart preview

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This commit is contained in:
Jan Prochazka
2021-11-11 13:39:53 +01:00
parent 0fd4084fac
commit 4faaaa1eb7
3 changed files with 14 additions and 4 deletions
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13
packages/api/src/controllers/files.js
View File

@@ -118,10 +118,19 @@ module.exports = {
}, },
exportChart_meta: 'post', exportChart_meta: 'post',
async exportChart({ title, config }) { async exportChart({ title, config, image }) {
const html = getChartExport(title, config);
const fileName = `${uuidv1()}.html`; const fileName = `${uuidv1()}.html`;
const imageFile = `${fileName}.png`;
const html = getChartExport(title, config, imageFile);
await fs.writeFile(path.join(uploadsdir(), fileName), html); await fs.writeFile(path.join(uploadsdir(), fileName), html);
if (image) {
const index = image.indexOf('base64,');
if (index > 0) {
const data = image.substr(index + 'base64,'.length);
const buf = Buffer.from(data, 'base64');
await fs.writeFile(path.join(uploadsdir(), imageFile), buf);
}
}
return fileName; return fileName;
}, },
}; };

4
packages/api/src/utility/getChartExport.js
View File

@@ -1,4 +1,4 @@
const getChartExport = (title, config) => { const getChartExport = (title, config, imageFile) => {
return `<html> return `<html>
<meta charset='utf-8'> <meta charset='utf-8'>
@@ -25,7 +25,7 @@ const getChartExport = (title, config) => {
</html> </html>
<body onload="showChart()"> <body onload="showChart()">
<img src="img1.png" id="myImage" /> <img src="${imageFile}" id="myImage" />
<div> <div>
<canvas id="myChart"></canvas> <canvas id="myChart"></canvas>

1
packages/web/src/charts/ChartCore.svelte
View File

@@ -67,6 +67,7 @@
data, data,
options, options,
}, },
image: domChart.toDataURL(),
}); });
window.open(`${resolveApi()}/uploads/get?file=${resp.data}`, '_blank'); window.open(`${resolveApi()}/uploads/get?file=${resp.data}`, '_blank');