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Editorial Team
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Asked: 2026-05-25T21:16:00+00:00

This error only appears if I try to put two charts on the same

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This error only appears if I try to put two charts on the same page. Both charts work perfectly if they are the only one on the page. The minute I add the second only the first one loads and I get the “Missing Query for request id: 0” error.
Here is my js file for the chart: 

function drawChart(title, queryPage, divToFill) {
var dataTab = null;
var query = new google.visualization.Query(queryPage);
var strSQL = "SELECT *";

query.setQuery(strSQL);

query.send(processInitalCall);

function processInitalCall(res) {
    if(res.isError()) {
        alert(res.getDetailedMessage());
    } else {
        dataTab = res.getDataTable();

        // Draw chart with my DataTab
        drawChart(dataTab);
    }
}

function drawChart(dataTable) {
    // Draw the chart
    var options = {};
    options['title'] = title;
    options['backgroundColor'] = "#8D662F";
    var colors = Array();
    var x = 0;
    if(currentCampaignId >= 0) {
        while(x < dataTab.getNumberOfColumns() - 2) {
            colors[x] = '#c3c1b1';
            x++;
        }
        colors[x] = '#d2bc01';
    }
    else {
        colors[0] = '#c3c1b1';
    }
    options['colors'] = colors;
    options['hAxis'] = {title: "Week", titleColor: "white", textColor: "white"};
    options['vAxis'] = {title: "Flow", titleColor: "white", textColor: "white", baselineColor: "#937d5f", gridColor: "#937d5f"};
    options['titleColor'] = "white";
    options['legend'] = "none";
    options['lineWidth'] = 1;
    options['pointSize'] = 3;
    options['width'] = 600;
    options['height'] = 300;
    var line = new google.visualization.LineChart(document.getElementById(divToFill));
    line.draw(dataTab, options);
}
}

Here is a snip from the index.php file: 

<body>
<script type="text/javascript">
google.load('visualization', '1', {'packages': ['table', 'corechart']});
google.setOnLoadCallback(function(){
drawChart("Water", "waterData.php", "water");
drawChart("Air", "airData.php", "air");
});  

</script>
<div id="water" style="text-align: center;"></div>
<div id="air" style="text-align: center;"></div>
</body>

It throws the error right at the query.send(processInitalCall); line, only on the second time it’s called. Both the waterData.php and airData.php are identical except for the sig field. I did notice there was a field called reqId and it’s set to 0.

Do I need to somehow change this reqId in these classes?

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1 Answer

  1. Editorial Team

    Probably too late, but for anyone interested…

    When loading data from the data source, there will be a GET parameter in the request – tqx – with a value like: “reqId:0”. You must return the same reqId in your response.

    From the docs:

    reqId – [Required in request; Data source must handle] A numeric
    identifier for this request. This is used so that if a client sends
    multiple requests before receiving a response, the data source can
    identify the response with the proper request. Send this value back in
    the response.

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