java - Passing an array of values from Android Activity to JavaScript in a WebView -
i'm using js charts library draw graphs in webview of android application. want provide data sqlite database. @ moment i'm stuck on how pass array of data java javascript. javascript part expects that:
data = new array([10, 10], [20, 10]); i know addjavascriptinterface , managed pass single values activity webview. it's array gives me trouble. thought that:
final class chartdataloader { public double[][] getdata() { double[][] data = {{10, 10}, {20, 10}}; return data; } } note i'm hard-coding data, pulled out database. expose js:
webview.addjavascriptinterface(new chartdataloader(), "dataloader"); and try read in javascript:
<html> <head> <script type="text/javascript" src="jscharts.js"></script> </head> <body> <div id="chartcontainer">you should see chart here.</div> <script type="text/javascript"> mydata = dataloader.getdata(); alert("datareceived: " + mydata.length); alert("element 0 : " + mydata[0]); var mychart = new jschart('chartcontainer', 'line'); mychart.setdataarray(mydata); mychart.draw(); </script> </body> </html> javascript fails on 2 alert statements stating:
error/web console(2455): uncaught typeerror: cannot read property 'length' of undefined @ file:///android_asset/chart.html:15
any hints? saw code online other people convert arrays string , recreate in javascript seems overkill me , hoping better solution. alternative pass xml file chart library, again, thought slow create new xml every time user wants see graph.
remove line: alert("datareceived: " + mydata.length);
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