A dynamic URL builder using select inputs and vanilla Javascript.

CodePen example:

Setting the select inputs

Each of the select inputs needs to be assigned to a variable to get the value and also add an event listener for change later

One of the select inputs HTML:

<select class="form-select" id="stat-type-select" name="stat-type-select">
   <option value="team">Team</option>
   <option value="player" selected>Player</option>
</select>

Assigning to a variable by using getElementById()

let stat_select = document.getElementById("stat-type-select");

Setting the base URL to avoid repeating it in each of the event listeners:

let base_url = 'https://domain.com/';

On select input change

When any of the select inputs are interacted with then the URL needs to be modified to contain the new value. Each input gets an addEventListener for change:

stat_select.addEventListener('change', function () {
    //stat-type-select input was changed
});

In each of these event listeners is an assigner for the URL. In reality, it will be window.location.href = to redirect the browsing window. But for this example, it is assigning a text input the URL value.

url_input.value = base_url + season_select.value + '/' + stat_select.value + '/' + season_type_select.value + '/' + stat_mode_select.value;

View the full code here at CodePen.