How to effectively use js.hidden

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<table>
<tr><tr>
<tr id = select>custom dropdown select tag <tr>
<tr id = div1><tr>
<tr id = div2><tr>
<tr id = div3><tr>
<tr id = div4><tr>
<tr><tr>
<tr><tr>
</table>

I was looking for an efficient way to use js. hidden, 
if getElementById(select) =1, only the tr tag with id 1 should be displayed, if getElementById(select) =3, id =div1,div2,div3 should be displayed and not 4. I'm currently writing an if else statement that goes something like this:

if(document.getelementbyid("select")value == 2){
   document.getelementbyid("div1").hidden = false ;
   document.getelementbyid("div2").hidden = false ;
   document.getelementbyid("div1").hidden = true;
   document.getelementbyid("div2").hidden = true;

}
else {
   document.getelementbyid("div1").hidden = false ;
   document.getelementbyid("div2").hidden = false ;
   document.getelementbyid("div1").hidden = false ;
   document.getelementbyid("div2").hidden = false ;
}
...

Similarly, I'm repeating for all values, but I'd like to know the most efficient way to do this, because I have many tr tags in the table with different ids that I want to change only with a specific 12 ids after select<tr> tag that has an id .

What I have tried:

if(document.getelementbyid("select")value == 2){
   document.getelementbyid("div1").hidden = false ;
   document.getelementbyid("div2").hidden = false ;
   document.getelementbyid("div1").hidden = true;
   document.getelementbyid("div2").hidden = true;

}
else {
   document.getelementbyid("div1").hidden = false ;
   document.getelementbyid("div2").hidden = false ;
   document.getelementbyid("div1").hidden = false ;
   document.getelementbyid("div2").hidden = false ;
}
...

Posted 24-Apr-22 15:22pm

Member 13483093

Updated 24-Apr-22 17:32pm

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Sandeep Mewara · Answer 1 · 2022-04-24T17:32:00

One of the efficient ways to deal with something like above would be to use jQuery and attribute-starts-with selector to have it like:

JavaScript

// all div's id starts like div_ (eg: div_1, div_2, div_3, etc)
$('[id^="div_"]').hide();

jQuery is a fast, small, and feature-rich JavaScript library, read here: jQuery[^]