RGraph reload the previous graph when i reload the page and i click the body of the page

问题

i use that for clear the graphs:

for (var i=0; i< document.getElementsByTagName('canvas').length; i++) {
RGraph.Clear(document.getElementsByTagName('canvas')[i]);
}

when i reload the page the previous appear and the new graph is placed over the last one, and the new label is placed above the last one

i use donut and pie charts

thankss!!!

回答1:

You need to clear the ObjectRegistry, which keeps track of objects. You can do that with:

RGraph.ObjectRegistry.Clear();

Or you can clear objects related to a specific canvas tag with:

RGraph.ObjectRegistry.Clear(myCanvas);

Or you can remove a specific object with:

RGraph.ObjectRegistry.Remove(myObject);

You can read more about the ObjectRegistry on the API docs page:

https://www.rgraph.net/canvas/docs/api.html#objectregistry

回答2:

You can also use RGraph.Clear(document.getElementById("The Id of your element"));

来源：https://stackoverflow.com/questions/10853678/rgraph-reload-the-previous-graph-when-i-reload-the-page-and-i-click-the-body-of