I want to be able to update the line chart of google visualizations. My code was inspired by this Stack Overflow post.
Here is my code in question:
You'll see that when you click the button titled "click", the chart suddenly disappears.
UPDATE: When I comment out this line, it appears to be working:
// this.element.html(''); And it does not appear to work for the line chart. Any idea why it won't work for the line chart?
There seem to be a few issues around the usage of jQuery selectors in your code; it's somewhat confusing around the sections where you're calling $(element) and $(element)[0] etc. In general I'd avoid jQuery here, the refresh works by replacing both of:
add('LineChart', '#mileage') with add('LineChart', 'mileage')$(element)[0] with document.getElementById(element)Some general advice here:
this.element.html(''), simple passing in a new data table and re-calling .draw(newDataTable, opts) is fine. Whilst potentially beyond the needs of this post, the new gviz animation functionality is a good example of this (you just call redraw with updated data, and the graph animates the change).Obviously I'm unaware of the full need of your implementation, but I feel like your code may be slightly more involved than you need. Depending on how you get can data sent from your server, you can pretty easily reload a chart. I've given some details in this question, but in brief it looks like this:
function drawMyChart(dataTable) { // convert your dataTable to the right format // options here include loading from arrays, json representations of your datatable // or something more manual perhaps var opts = {height:50, width:50}; var chart = new google.visualization.LineChart(document.getElementById('vis')); chart.draw(dataTable, opts); } function makeAjaxCall() { $.ajax({ url: '/path/to/data/json', sucess: drawMyChart(a), dataType: 'json' // this is important, have it interpreted as json }); } // html somewhere <div id='vis'></div> <input type='button' onclick='makeAjaxCall()'>Go</input> Hope that helps.