为什么我的代码不能将我的图表保存为图像?我某处有错吗? 虽然我遵循了源代码(在网上找到),但我仍然无法解决我的问题。
我可以显示图表,但只有问题无法保存为图像。
<script type="text/javascript" src="js/jsapi.js"></script>
<script type="text/javascript">
function saveAsImg(chartContainer, pngfilename) {
var chartArea = chartContainer.getElementsByTagName('svg')[0].parentNode;
var svg = chartArea.innerHTML;
var doc = chartContainer.ownerDocument;
var canvas = doc.createElement('canvas');
canvas.setAttribute('width', chartArea.offsetWidth);
canvas.setAttribute('height', chartArea.offsetHeight);
canvas.setAttribute(
'style',
'position: absolute; ' +
'top: ' + (-chartArea.offsetHeight * 2) + 'px;' +
'left: ' + (-chartArea.offsetWidth * 2) + 'px;');
doc.body.appendChild(canvas);
canvg(canvas, svg);
var data = canvas.toDataURL("image/png");
canvas.parentNode.removeChild(canvas);
data = data.substr(data.indexOf(',') + 1).toString();
var dataInput = document.createElement("input") ;
dataInput.setAttribute("name", 'imgdata') ;
dataInput.setAttribute("value", data);
var nameInput = document.createElement("input") ;
nameInput.setAttribute("name", 'name') ;
nameInput.setAttribute("value", pngfilename + '.png');
var myForm = document.createElement("form");
myForm.method = 'post';
myForm.action = 'saveme.php';
myForm.appendChild(dataInput);
myForm.appendChild(nameInput);
document.body.appendChild(myForm) ;
myForm.submit() ;
document.body.removeChild(myForm) ;
}
</script>
<script type="text/javascript">
google.load('visualization', '1', {packages: ['corechart']});
</script>
<script type="text/javascript">
function drawVisualizationDaily() {
// Create and populate the data table.
Price1=document.getElementById('Price1').value;
Price2=document.getElementById('Price2').value;
Price3=document.getElementById('Price3').value;
Price4=document.getElementById('Price4').value;
Price5=document.getElementById('Price5').value;
Price6=document.getElementById('Price6').value;
Price7=document.getElementById('Price7').value;
var data = google.visualization.arrayToDataTable([
['Daily', 'Sales'],
['Mon', parseInt(Price1) ],
['Tue', parseInt(Price2) ],
['Wed', parseInt(Price3) ],
['Thu', parseInt(Price4) ],
['Fri', parseInt(Price5) ],
['Sat', parseInt(Price6) ],
['Sun', parseInt(Price7) ]
]);
// Create and draw the visualization.
new google.visualization.ColumnChart(document.getElementById('visualization')).
draw(data,
{title:"Daily Sales",
width:500, height:400,
hAxis: {title: "Daily"}}
);
}
google.setOnLoadCallback(drawVisualizationDaily);
</script>
<div id="visualization" style="width: 600px; height: 400px;"></div>
<script>
<a href='#' onClick="saveAsImg(document.getElementById('visualization'), 'test');">Test</a>
</script>
答案 0 :(得分:11)
不再需要该方法来获取图表的图像。您可以调用图表的getImageURI
方法来获取用于生成图像的URL字符串:
var chart = new google.visualization.ColumnChart(document.getElementById('visualization'));
google.visualization.events.addListener(chart, 'ready', function () {
var imgUri = chart.getImageURI();
// do something with the image URI, like:
window.open(imgUri);
});
chart.draw(data, {
title:"Daily Sales",
width:500,
height:400,
hAxis: {title: "Daily"}
});
如果您打开图像URI,则可以右键单击图像进行保存。