Get javascript function parameters

Question

I am trying to write a code for Greasemonkey. I can handle the tagnames, ids etc. But I got stuck in the 'script' tag. I can get the innerHTML of this script tag. But I want to get the input parameters only of the 'on' function, specifically 4th input which is a number. And store them in an array.

<ol id="online1">
        <script language="javascript" >
            on('0','2','abc','401757','');
    on('1','1','asd','1115337','');
    on('2','2','asdsad','1169333','');
    gi('asdasd','10453','');
    gi('asdasd','10453','');
.
.
.
.
</script>

Should result in

array = [401757,1115337,1169333];

I can get the innerHTML of the script like this:

window.frames[2].document.getElementById('online1').getElementsByTagName('script')[0].innerHTML

Ok this is the first step. So you are saying that technically I can parse the contents between the 'on(' and ');' then parse the content between the 3rd and 4th comma. Can you give a bit more clue — ardavar
– ardavar, Commented Sep 29, 2014 at 18:52

Community · Accepted Answer · 2017-05-23 10:33:24Z

1

As per your example, you can just use .split() on the innerHTML using , as a delimiter. If you want, you can add in an extra safeguard and use a function to detect whether you're getting a number.

JavaScript:

var vals = document.getElementsByTagName('script')[2].innerHTML.split(',');
for(var i = 3; i < vals.length; i+=4)
{
    console.log(vals[i]);
}

Output:

'401757'
'1115337'
'1169333'
'10453'

jsFiddle

edited May 23, 2017 at 10:33

CommunityBot

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answered Sep 29, 2014 at 18:53

Alex W

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3 Comments

ardavar Over a year ago

This makes sense too. Is this approach correct then? 1-split using ; to get rows 2-split using , to get parameters 3-check if the first parameter is 'on'

Alex W Over a year ago

@ardavar Generally, that's the idea. Just keep in mind that if a comma or semicolon is missing this approach will fail.

ardavar Over a year ago

This is close enough, in my example it will fail because parameters hence the commas are not standard in all functions I will add some checkpoints to filter the functions.

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