CODEWITHSUNDEEP
javascriptphpd3.js
0plus1
0plus1

Reputation: 4555

d3.json what kind of request its making?

I am using this d3 plugin: http://kamisama.github.io/cal-heatmap/ its loading json data from a local url, I usually add this control in PHP to check if the call is a proper AJAX call:

define('IS_AJAX', isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest');

this checks fails and I was able to backtrace it to the d3.json function.

Can someone explain to me what kind of request is d3.json making?

Thank you very much.

EDIT:

This is the code:

        <script type="text/javascript">
    var cal = new CalHeatMap();
    cal.init(
    {
        cellSize:15,
        range: 12,
        domain: "month",
        data: '<?php echo $url; ?>',
        legendHorizontalPosition: 'center',
        legendCellSize: 15
    }
    );
    </script>

$url is the url that returns the json.

Upvotes: 0

Views: 132

Answers (1)

Christopher Hackett
Christopher Hackett

Reputation: 6192

First of it's not clear from the documentation how data is processed. So we can take a quick look at the code (Line 2459 src\cal-heatmap.js) 

switch(typeof source) {
    case "string":
        if (source === "") {
            _callback({});
            return true;
        } else {
            switch(this.options.dataType) {
            case "json":
                d3.json(this.parseURI(source, startDate, endDate), _callback);
                break;

When we pass a string rather than an object it checks the extension and uses d3's helper method so should behave just like d3.json() which in itself is wraps around d3.XHR(). None of the documentation says it sends HTTP_X_REQUESTED_WITH. A lot of other frameworks do hence why you see it almost the universal method for detecting a AJAX call but it is not required.

Upvotes: 2

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