Javascript to set slider value with System Events

If I open System Preferences and run this in Script Editor, it fails. It sets the volume to zero, not 50%.
var se = Application("System Events");
var spp = se.processes["System Preferences"];
var curr = spp.windows[0].sliders[0].value();
console.log("Current value: " + curr + " - " + typeof(curr));
spp.windows[0].sliders[0].value = 0.5
var curr = spp.windows[0].sliders[0].value();
console.log("Current value: " + curr + " - " + typeof(curr));
But the same thing in AppleScript seems to work fine.
tell application "System Events"
   tell process "System Preferences"
   set v to value of slider 0 of window 0
   log v
   set value of slider 0 of window 0 to 0.5
   end tell
end tell
Anyone know what the problem is?
thanks,
Rob

Jon Handy wrote:
Hello,
You should use something like this within the link attribute for that report column.
onClick="javascript:setItem('P48_RECEIPT_ID',#RECEIPT_ID#);"As noted above, it is not considered good practice in this forum to post unnecessary follow-ups to long expired threads and users. It's worse to do so with information that is inaccurate or incomplete.
What is the purpose of <tt>javascript:</tt> in this code?
What is <tt>setItem</tt>? It is not a standard APEX JavaScript API method.
You're welcome to get involved in the forum, but why make your first post an inaccurate response to a random 6 month old post that is only one of hundreds/thousands of questions on setting an item value using JavaScript?

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>I have a form that has Start Date and End Date text
fields that I want to
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