How to count the sum of values from multiple selects with jquery?

Question

I have multiple selects with the same class name. How can I count the sum of the selected options?

My html/Twig (I have like 6 more selects with the class "adults-select")

<select class="adults-select" data-type="adults">
   {% for i in 1..5 %}
   <option value="{{ i }}">{{ i }}</option>
   {% endfor %}
</select>

My Jquery

$(document).on('change', '.adults-select', function(){
   var sum = 0;
   $("select.adults-select option:selected").each(function(){
      sum += Number($(this).val());
   });
console.log(sum);
});

If I use sum += Number($(this).val()); and I pick 3 adults, I get in 12 in my console.

If I use sum += parseInt($(this).val()); I get Nan in my console

If I use sum += $(this).val(); I get something like 03111111 in my console.

So basically, how can I get the sum of the values I have in my selects?

Added HTML code

<!-- BEGIN common_search_form_hotel -->
<form id="search_hotel_form" action="{{__pages.search_hotel}}" class="container">
  <div class="form-search-table">
    <div id="hotel-search-city-and-name" class="hotel-row-0 d-flex">
      <div class="d-flex mb-3 flex-fill">
        {#<span class="input-icon align-self-center">#}
        {#  <img src="{{__globals.config.paths.upload}}/assets/images/flag.png">#}
        {#</span>#}
        <input class="input_search_in_2 flex-fill shadow-sm" id="hotel_city_name" placeholder="{% filter translate|e %}Choose a city for destination{% endfilter %}" type="text" required />
        <input type="text" id="hotel_city_id" required style="display:none;"/>
      </div>

    </div>
    {#<div class="hotel-row-1">#}



        <input id="hotel-checkin-date" class="input_search_with_title" type="text" required>

        {#<p class="div_title_hotel">{% filter translate %}check-out{% endfilter %}</p>#}
        <input id="hotel-checkout-date" class="input_search_with_title" type="text" required>
      {#</div>#}

<div class="hotel-row-2 template hotel_rooms" id="hotel_room_template">

    <div class="room_people_margin_left d-flex">

        <div class="mb-3 d-block d-md-inline-flex order-2 order-md-1">

          {# makeselectpicker #}

          <div class="titles">
              <p class="div_title_adults">{% filter translate %}Adults{% endfilter %}</p>

              <p class="div_title_children">{% filter translate %}Children{% endfilter %}</p>

              <p class="div_title_child_age1">{% filter translate %}Child 1 Age{% endfilter %}</p>

              <p class="div_title_child_age2">{% filter translate %}Child 2 Age{% endfilter %}</p>
          </div>

          <select class="adults-select" data-above-text="{% filter translate|e %}adults{% endfilter %}" data-type="adults">
              <option value="" disabled >Number of Adults</option>
            {#<optgroup label="{% filter translate|e %}adults{% endfilter %}">#}
              {#{% for i in 1..5 %}#}
              {#<option value="{{ i }}">{{ i }}</option>#}
              {#{% endfor %}#}
              <option value="1">1</option>
              <option value="2">2</option>
              <option value="3">3</option>
              <option value="4">4</option>
              <option value="5">5</option>
            {#</optgroup>#}
          </select>

          <select class="children-select" data-above-text="{% filter translate|e %}children{% endfilter %}" data-type="children">
              <option value="" disabled >Number of Children</option>
            {#<optgroup label="{% filter translate|e %}children{% endfilter %}">#}
              {% for i in 0..2 %}
              <option value="{{ i }}">{{ i }}</option>
              {% endfor %}
            {#</optgroup>#}
          </select>

          <select class="child-age-select-1" data-above-text="{% filter translate|e %}age child 1{% endfilter %}" data-type="child_1_age" >
            {#<optgroup label="{% filter translate|e %}age child 1{% endfilter %}">#}
            <option value="" disabled >Child 1 Age</option>
              {% for i in 0..17 %}
              <option value="{{ i }}">{{ i == 0 ? ("&lt;1y"|translate) : ( i == 1 ? ('1y'|translate) : ('%dy'|translate|format(i))) }}</option>
              {% endfor %}
            {#</optgroup>#}
          </select>

            {# child-age-select2 #}
          <select class="child-age-select-2 " data-above-text="{% filter translate|e %}age child 2{% endfilter %}" data-type="child_2_age">
              <option value="" disabled >Child 2 Age</option>
            {#<optgroup label="{% filter translate|e %}age child 2{% endfilter %}">#}
              {#<optgroup label="{% filter translate|e %}age child 1{% endfilter %}">#}
              {% for i in 0..17 %}
              <option value="{{ i }}">{{ i == 0 ? ("&lt;1y"|translate) : ( i == 1 ? ('1y'|translate) : ('%dy'|translate|format(i))) }}</option>
              {% endfor %}
            {#</optgroup>#}
          </select>
        </div>


        <div class="">
            <p class="div_title_hotel">{% filter translate %}Rooms{% endfilter %}</p>

          {#<span class="input-icon align-self-center">#}
          {#  <img src="{{__globals.config.paths.upload}}/assets/images/bed.png" class="">#}
          {#</span>#}

        <select class="rooms-select shadow-sm" required data-type="rooms">
            <option value="" disabled selected="selected" >Number of Rooms</option>
            {#<optgroup label="{% filter translate %}rooms{% endfilter %}">#}
              {% for i in 1..5 %}
              <option value="{{ i }}">{{ i }}</option>
              {% endfor %}
            {#</optgroup>#}
          </select>
            <input type="text" class="col-6 shadow-sm input_search_with_title" name="datefilterhotel" readonly="readonly" placeholder="Pick your Dates" value="" style="font-size:0.8em" />
        </div>
      </div>
    </div>
    <input class="input_search_in_2 flex-fill" id="hotel_name" placeholder="{% filter translate|e %}hotel name{% endfilter %} ({% filter translate|e %}optional{% endfilter %})" type="text" required/>
          {#<span class="input-html-placeholder"><span class="input-html-placeholder-content">{% filter translate %}hotel's name{% endfilter %} <em>({% filter translate %}optional{% endfilter %})</em></span></span>#}
  </div>

  <a id="hotel_search_button" href="javascript:void(0);">
    <p class="search_big_but search_hotel">{% filter translate %}Find your best accommodation{% endfilter %}</p>
  </a>
  <input type="submit" style="display:none" />
</form>
<!-- END common_search_form_hotel -->

Bhushan Kawadkar · Accepted Answer · 2019-08-29 12:50:33Z

1

Try this: You are using .val() but jquery selector is options instead of select element. Also, for extra check you can return 0 if parseInt fails

$(document).on('change', '.adults-select', function(){
   var sum = 0;
   $("select.adults-select").each(function(){
      sum = parseInt(sum) + (parseInt($(this).val()) || 0);
   });
console.log(sum);
});

edited Aug 29, 2019 at 12:50

answered Aug 29, 2019 at 12:41

Bhushan Kawadkar

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5 Comments

BilendM Over a year ago

Same thing :/ When I pick 1 Adult, I get 10 in my console. When I pick 2 Adults, I get 11 in my console. When I pick 4 Adults, I get 13 in my console.

Bhushan Kawadkar Over a year ago

try updated post, in your case somehow sum is considered as text instead of number hence instead of adding number it is concatenating the values

BilendM Over a year ago

I tried the Updated code. It's still giving me the same thing.

BilendM Over a year ago

I technically can, But I using Twig and I doubt it is going to be useful as I am using and importing multiple snippets :/

Bhushan Kawadkar Over a year ago

I would suggest to do debugging on the browser which way you can find what exactly happening on the js code. You can check stackoverflow.com/questions/66420/… or google if using different browser

Devsi Odedra · Accepted Answer · 2019-08-29 12:42:47Z

0

Your code is just ok. just add condition before += to check getting value or '' option selected.

$(document).on('change', '.adults-select', function(){
   var sum = 0;
   $("select.adults-select option:selected").each(function(){
      if($(this).val()){
        sum += Number($(this).val());
      }
      
   });
console.log(sum);
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select class="adults-select" data-type="adults">
  <option value=""></option>
   <option value="5">5</option>
   <option value="6">6</option>
   
</select>

<select class="adults-select" data-type="adults">
  
   <option value="8">8</option>
   <option value="9">9</option>
   
</select>

answered Aug 29, 2019 at 12:42

Devsi Odedra

5,3421 gold badge25 silver badges38 bronze badges

4 Comments

BilendM Over a year ago

Same thing :/ When I pick 1 Adult, I get 10 in my console. When I pick 2 Adults, I get 11 in my console. When I pick 4 Adults, I get 13 in my console.

Devsi Odedra Over a year ago

post your all select html here.

alexandercannon Over a year ago

I think your select is the problem too, if you share the generated HTML it's a lot easier to debug

BilendM Over a year ago

I added the HTML code, but I don't know if it is going to be of much help

alexandercannon · Accepted Answer · 2019-08-29 12:59:10Z

0

Here's a vanilla JS example of what I think you're trying to do.

var adSels = document.querySelectorAll('.adults-select');

var val = null;

adSels.forEach(function(adSel) {
  adSel.addEventListener('change', function() {
    val = 0
    adSels.forEach(function(adSel) {
      val += Number(adSel.value);
    });
    console.log(val);
  });
});

<select class="adults-select" data-type="adults">
  <option value="0">0</option>
  <option value="1">1</option>
  <option value="2">2</option>
  <option value="3">3</option>
</select>

<select class="adults-select" data-type="adults">
  <option value="0">0</option>
  <option value="1">1</option>
  <option value="2">2</option>
  <option value="3">3</option>
</select>

edited Aug 29, 2019 at 12:59

answered Aug 29, 2019 at 12:48

alexandercannon

5436 silver badges24 bronze badges

5 Comments

BilendM Over a year ago

I get Nan with this :(

alexandercannon Over a year ago

Sorry, I broke it trying to remove all the ES6, fixed now!

BilendM Over a year ago

You're gonna hate me for this. But, I am still getting Nan.

alexandercannon Over a year ago

Are you getting NaN in the browser example or in your code? If it's here it might be a cross-browser compatibility issue, if it's in your code you might be adding something that can't be parsed as a number. For example Number('a string') // => NaN

BilendM Over a year ago

It's in the browser

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