How to use Javascript value as Javascript Variable or function

Question

is there is any alternate solution for the below javascript code i need to use JS value as JS variable or function

<script type="text/javascript">
    var count = 1;
    var parent_var = '.parentElement'; //dynamically get variable
    while(count == 5){
      parent_var = parent_var+'.parentElement';
      parent = document.getElementById('html_id')+parent_var;
      console.log(parent); 
      count++;
    }
</script>

EXPECTED OUTPUT

parent = document.getElementById('html_id').parentElement.parentElement.parentElement.parentElement.parentElement;

i need to get parent element dynamically based on some loop count, every loop append .parentElement

it dynamically get before parent in each loop

Thanks in advance ...

Can you explain what you are trying to do? You say "every loop append" and "each loop" but we don't see any loops. — Ray Toal
– Ray Toal, Commented Sep 19, 2017 at 3:41

met4000 · Accepted Answer · 2017-09-19 03:56:57Z

1

It seems like you want to get the parent element on each loop. Try doing:

var currentElement = document.getElementById("html_id");
while (currentElement.tagName.toLowerCase() != "body") {
  currentElement = currentElement.parentElement;
  console.log(currentElement);
}

answered Sep 19, 2017 at 3:56

met4000

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2 Comments

Kavin D Over a year ago

Thank you :) .. I edited the question and please see expected output.

met4000 Over a year ago

Do you want to see that thing or what is returned by that? Also, how far back do you want it to iterate? Eventually it well get to the html page and then to null

Peter-Yu · Accepted Answer · 2017-09-20 03:47:19Z

0

Looks you want to let string to be executable code, you could try eval() function.

parent = eval("document.getElementById('html_id')"+parent_var);

answered Sep 20, 2017 at 3:47

Peter-Yu

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2 Comments

Kavin D Over a year ago

Thank you, I got answer here .. stackoverflow.com/a/46291542/7052574 and have some security issue. kindly refer below link. security.stackexchange.com/a/94021

met4000 Over a year ago

As the JS saying goes: eval is evil

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