echo values of an array into jQuery

Question

So I am using FLOT to generate some bar graphs and it uses some javascript arrays to allow for the data. I have a query that spits out the correct labels and values as so:

while ($row = mysql_fetch_array($chart_stats)){

printf("Race is: %s Percentage: %s", $row['Race'],$row['Percentage'] ."<br/>");

}

My question is can I get the values of my array from php into the array of Javascript (if that makes sense)

    var d1 =[0, 72]; //instead of static value maybe var d1 = [0,<?printf($row['Percentage'])?>];
    var d2 =[1,3];
    var d3 = [2,40];

Thanks in advance!

Niet the Dark Absol · Accepted Answer · 2012-06-11 15:50:08Z

1

Yes, you can echo stuff from PHP wherever you like. When putting it into a block of JavaScript, though, you have to be careful that:

The resulting output is ALWAYS valid code
There is no way for user-generated input to be placed into code and run

The second one is simple: never put anything you got from $_POST into a <script> tag.

As for the first, json_encode is a big help. With it, you can output almost any kind of PHP variable as a valid JavaScript one.

answered Jun 11, 2012 at 15:50

Niet the Dark Absol

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4 Comments

Marcel Korpel Over a year ago

About use of $_POST: you can use htmlspecialchars to circumvent XSS attacks, can't you?

Niet the Dark Absol Over a year ago

Yes, you can, but that won't protect you if you dump the content directly into a <script> tag.

pcproff Over a year ago

Beautiful! This spits out my values in an array like so: "76.9""21.0""15.6""2.8""2.4""1.9""0.3""0.0" How can I get these values indivdually into each one of those javascript vars?

Niet the Dark Absol Over a year ago

If you just put var myarray = <?php echo json_encode($array); ?> (assuming the right variable name) the result will be a JavaScript array, which you can then use in any way you like.

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