jqPlot charts on page load

I have a form where I select the number of items. Upon clicking submit, it should take me to a new page where it would display the item selected and depending on the number of items selected, it would create those many j开发者_StackOverflowqPlots, one for each item.

Any suggestions on how do I go about doing this?

Thanks, S.

It's hard to give any specifics without more detail about the items, but basically you would pass a JSON structure to your view with the items to be plotted. Then you would loop through the JSON structure, creating DIV tag for each item to be plotted and appending the DIV tags to the body.

The Javascript part would look something like this:

$.each(items, function(index, value) {
  $myPlot = $("<div>");

  $myPlot.attr("id", "item"+index);

  $.jqplot($myPlot.attr("id"), ...);

  $("body").append($myPlot);

});

This question is very general, but answering (specifically and only) the question of loading multiple charts:

You need a unique HTML div id for each chart; consider using an RFC 4122 UUID (generate as needed) for each chart/div rather than a sequential index for each. Use something that looks like this as a placeholder div for each:

<div class="chartdiv" id="chartdiv-${UID}">
  <a rel="api" type="application/json" href="${JSON_URL}" style="display:none">Data</a>
</div>

This embeds the JSON URL for each div inside it, in a hidden hyperlink that can be discovered by JavaScript iterating over your multi-chart HTML page.

The matter of the UUID is inconsequential -- it just seems the most robust way to guarantee a unique HTML id addressable by JavaScript for each chart.

Subsequently, you should have JavaScript that looks something like:

jq('document').ready(function(){
    jq('.chartdiv').each(function(index) {
        var div = jq(this);
        var json_url = jq('a[type="application/json"]', div).attr('href');
        var divid = div.attr('id'); 
        jq.ajax({
            url: json_url,
            success: function(responseText) { /*callback*/
                // TODO: responseText is JSON, use it, normalize it, whatever!
                var chartdata = responseText;
                jq.jqplot(divid, chartdata.seriesdata, chartdata.options);
            }   
        }); 
    }); 

});