Google Linechart Visualization Chart Disappears When Updating It?
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: http://jsfiddle.net/YCqyG/5/ You
Solution 1:
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')
withadd('LineChart', 'mileage')
$(element)[0]
withdocument.getElementById(element)
Some general advice here:
- You don't need to clear out the div before re-rendering a chart (i.e.: No need to call
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:
functiondrawMyChart(dataTable) { // convert your dataTable to the right format// options here include loading from arrays, json representations of your datatable// or something more manual perhapsvar opts = {height:50, width:50}; var chart = new google.visualization.LineChart(document.getElementById('vis')); chart.draw(dataTable, opts); } functionmakeAjaxCall() { $.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> <inputtype='button'onclick='makeAjaxCall()'>Go</input>
Hope that helps.
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