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Derive field name from accepted / known field name [dimensional or array fieldname]

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<input name="weekday[8]" type="checkbox" value="21" class="weekday" checked="">
<input name="timing[8]" type="text" id="name" value="11" size="45" />

<input name="weekday[9]" type="checkbox" value="99" class="weekday" checked="">
<input name="timing[9]" type="text" id="name" value="12" size="45" />

<input name="weekday[10]" type="checkbox" value="77" class="weekday" checked="">
<input name="timing[10]" type="text" id="name" value="13" size="45" />

I have above html code

1. when checkbox for checkbox name="weekday[8]" is clicked, I want to check whether timing[8] is empty or not (we need to derive field name timing[8] from field name weekday[8]

2. when timing[8] some value is entered , i want to   name="weekday[8]" -> checked (we need to derive field name weekday[8] from timing[8]

we can find the name (jquery)

var checkboxname=$(this).attr('name');

// we get checkbox clicked name=name[8]

console.log('checkbox name='+checkboxname);



In simple case (without dimension) this is easy


we get name of field (checkbox is clicked) as name[8]

i want to derive field name timing[8]

i tried (jquery)


var checkboxname=$(this).attr('name');
console.log('checkboxname='+checkboxname);// i got this correct weekday[8] in this case

var splitname=checkboxname.split('weekday');// seperated [8] ,  

console.log(splitname[0]+'  1='+splitname[1]); //splitname[1] will have [8]

//now want to form or generate value of variable mobile[8]

var n='mobile'+splitname[1];//the n will be  mobile[8]
console.log('n='+n);// ths will be mobile[8]

var inp=$('input[name="'+n+'"]').val();
console.log(' inp='+inp);// but no success
//here I want value of $('input[name=name[8]').val(); 

Please guide how i derive (using jquery)

filed name mobile[8]  from filed name[8]



Edited by vikaspa
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  • Solution

The id of an element must be unique, so change those id="name" to class="name"

data attributes are useful. Give each pair of fields the same data-id value. (Easier than parsing names)

For example

<html lang="en">
<meta charset='utf-8'>
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css"> 
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script type='text/javascript'>
    $(function() {
        $(".weekday").click( function() {
            let id = $(this).data("id")                         // get data-id value of checkbox
            let time = $(".name[data-id="+id+"]")               // find timing inut with same data-id value
            if ($(this).is(":checked"))  {
            else {
<input name="weekday[8]" type="checkbox" value="21" class="weekday" checked data-id="8">
<input name="timing[8]" type="text" class="name" value="11" size="45" data-id="8">

<input name="weekday[9]" type="checkbox" value="99" class="weekday"  data-id="9">
<input name="timing[9]" type="text" class="name" value="" size="45" data-id="9">

<input name="weekday[10]" type="checkbox" value="77" class="weekday" data-id="10">
<input name="timing[10]" type="text" class="name" value="" size="45" data-id="10">



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I tried the reverse part

when timing is blank, uncheck the checkbox


  let weekday = $(".weekday[data-id="+id+"]") ; ==> I am getting this undefined

pls help


$('.timing').blur(function() {
     let id = $(this).data("id")       
     let timing=$(this).text().trim();                  //text stored in timing
     console.log('timing text ='+timing);         // display the text stored in timing

     let weekday = $(".weekday[data-id="+id+"]") ;                // find timing input with same data-id value

// i am getting weekday as unefined 
    console.log( 'timing blur weekday '+weekday ); // timing blur weekday [object Object]
    if (timing =='')       // text is blank
               $(weekday).prop('checked', true);// set checkbox checked

               $(weekday).prop('checked', false);// set checkbox un-checked

Edited by vikaspa
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