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大家知道,SpreadJS中的chart无法脱离SpreadJS单独展示,有时需要能够让用户看到图表,但不需要加载整个表格,这时可以考虑用生成图片的方式保存图表。
本文介绍怎样把SpreadJS中的图表转为base64格式的字符串,供我们接下来使用。
SpreadJS的chart是浮动对象的一种,浮动对象是按需加载的,所以要批量生成chart的图片,必须先激活它们。
// 需要激活图片的渲染,然后再执行导出
spread.bind(GC.Spread.Sheets.Events.FloatingObjectLoaded, function (e, info) {
var sheet = info.sheet;
var floatingObject = info.floatingObject;
var canvas = $(floatingObject.getHost()).find("canvas")[0];
if (canvas) {
var image = new Image();
image.src = canvas.toDataURL("image/png"); //console.log(image.src);
pics.push(image.src);
}
});
$("#convert").click(function () {
var sheet = spread.getActiveSheet();
var chart = sheet.charts.all()[0];
var canvas = $(chart.getHost()).find("canvas")[0];
var image = new Image();
image.src = canvas.toDataURL("image/png");
console.log(image.src);
alert("操作完成,请查看控制台");
});
完整版demo请参考此篇技术文章:SpreadJS怎样实现将chart导出为图片。
作者: GrapeCity China | 审核:Lynn.Dou | 更新时间:2023.11.09