javascript html pass variable [duplicate] - javascript

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What is the difference between client-side and server-side programming?
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Why does jQuery or a DOM method such as getElementById not find the element?
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Closed 17 days ago.
I have this piece of code:
<script>
const timesFromCombobox = document.getElementById("cas");
timesFromCombobox.addEventListener('change', timesTracker);
function timesTracker(){
console.log("val: " + timesFromCombobox.value)
console.log(<?= getDataFromSheetByRow(timesFromCombobox.value, 'z_data'); ?> )
}
</script>
but when refreshing page I get this error: ReferenceError: timesFromCombobox is not defined. How to pass reference to the function?

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i cannot make the year show.
Posted here:
https://jsfiddle.net/usge84vo/
HTML:
<footer>© copyright, <span id="year"></span></footer>
JS:
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const d = new Date();
document.getElementById("year").innerHTML = d.getFullYear();
});
Thank you!

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i'm working in a java script function which bind html.
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Refer to passed in variable in JavaScript function [duplicate]

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<script type="text/javascript">
function parent_work_copy(track_number) {
document.form1.track_(track_number)_name.value=document.form1.track_(track_number)_parent_work.value;
}
</script>
If the link below is clicked, I want the line inside of the parent_work_copy function to be modified to:
document.form1.track_5_name.value=document.form1.track_5_parent_work.value
copy to track
How to do this?
Javascript object keys works as string
document.form1["track_"+track_number+"_name"].value=document.form1["track_"+track_number+"_parent_work"].value;
Do something like this :
document.form1['track_'+track_number+'_name'].value

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