javascript - Where is the onclick function in this HTML snippet defined? -

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read code on htmlcodetutorial.com:

<form> <table border cellpadding=3> <tr> <td><nobr>radius: <input name="circle_radius" size=4></nobr></td> <td><input type=button onclick="circle_calc(this.form);" value="calculate"></td> <td align=right bgcolor="#aaccff"> <nobr>circumference: <input name="circle_circumference" size=9></nobr><br> <nobr>area: <input name="circle_area" size=9></nobr></td> </tr> </table> </form>

i can’t understand onclick="circle_calc(this.form);"

circle_calc(this.form) isn't defined anywhere. how function work? built-in function in html?

it's not built-in. if @ source code, it's defined as:

<script type="text/javascript"> <!-- function circle_calc(geoform) { var circleradius = geoform.circle_radius.value; if (circleradius >= 0)    {    geoform.circle_circumference.value =  2 * math.pi * circleradius ;    geoform.circle_area.value =  math.pi * math.pow(circleradius, 2) ;    } else    {    geoform.circle_circumference.value =  "";    geoform.circle_area.value =  "";    } } //--> </script>

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