How to use onclick event after an image generated by php code?
Question
I am creating an image which is a graph, plotting days and no of documents created on each day. I am using php to create image. Now, to get more details about the query, I want to enable the user to click on the image created and redirect him to more details, which is a table. Could anyone suggest me how to use onclick event...?
<html>
<body>
<script>
function details()
{
document.getElementById("imageform").submit();
}
</script>
<form name="imageform" id="imageform" method="get" action="resultdocument.php" >
<img border="0" src="<?php graphytry.php/img.png ?>" width="304" height="228" onclick="details()"></form>
</body>
</html>
PS:- Image is created in the same script, just above this HTML code.
The PHP code :-
<?php
# ------- The graph values in the form of associative array
$xaxis="Jan";
$yaxis=110;
$values=array(
$xaxis => $yaxis,
);
$img_width=450;
$img_height=300;
$margins=20;
# ---- Find the size of graph by substracting the size of borders
$graph_width=$img_width - $margins * 2;
$graph_height=$img_height - $margins * 2;
$img=imagecreate($img_width,$img_height);
$bar_width=20;
$total_bars=count($values);
$gap= ($graph_width- $total_bars * $bar_width ) / ($total_bars +1);
# ------- Define Colors ----------------
$bar_color=imagecolorallocate($img,0,64,128);
$background_color=imagecolorallocate($img,240,240,255);
$border_color=imagecolorallocate($img,200,200,200);
$line_color=imagecolorallocate($img,220,220,220);
# ------ Create the border around the graph ------
imagefilledrectangle($img,1,1,$img_width-2,$img_height-2,$border_color);
imagefilledrectangle($img,$margins,$margins,$img_width-1-$margins,$img_height-1-$margins,$background_color);
# ------- Max value is required to adjust the scale -------
$max_value=max($values);
$ratio= $graph_height/$max_value;
# -------- Create scale and draw horizontal lines --------
$horizontal_lines=20;
$horizontal_gap=$graph_height/$horizontal_lines;
for($i=1;$i<=$horizontal_lines;$i++){
$y=$img_height - $margins - $horizontal_gap * $i ;
imageline($img,$margins,$y,$img_width-$margins,$y,$line_color);
//$v=intval($horizontal_gap * $i /$ratio);
//imagestring($img,0,5,$y-5,$v,$bar_color);
}
# ----------- Draw the bars here ------
for($i=0;$i<$total_bars; $i++){
# ------ Extract key and value pair from the current pointer position
list($key,$value)=each($values);
$x1= $margins + $gap + $i * ($gap+$bar_width) ;
$x2= $x1 + $bar_width;
$y1=$margins +$graph_height- intval($value * $ratio) ;
$y2=$img_height-$margins;
imagestring($img,0,$x1+3,$y1-10,$value,$bar_color);
imagestring($img,0,$x1+3,$img_height-15,$key,$bar_color);
imagefilledrectangle($img,$x1,$y1,$x2,$y2,$bar_color);
}
header("Content-type:image/png");
imagepng($img);?>
1 answers
solution1
0 2013-05-07 09:54:34
You can look at the option of creating image map and generate x1,y1, x2,y2 co-ordinates for click event with separate AJAX request, if you need to have multiple clicks on image instead of single click.
More about image map : click here
If you are just looking for single click, then as @Andreas suggested, use below
<a href="resultdocument.php"><img /></a>
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