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How to create a filter with GET parameters preserving order of user choice?


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With javascript you can achieve it easily. The idea is to add an event listener to each input and re-order an array when the user change an input:

<form id="form">
  <label for="filter1">filter 1 :</label>
  <input type="text" id="filter1" name="filter1"><br>

  <label for="filter2">filter 2 :</label>
  <input type="text" id="filter2" name="filter2"><br>

  <label for="filter3">filter 3 :</label>
  <input type="text" id="filter3" name="filter3"><br>

  <button type="submit" name="submit">Send ☑️</button>
  // get form and all input
  const form = document.querySelector('#form');
  const filter1_field = document.querySelector('#filter1');
  const filter2_field = document.querySelector('#filter2');
  const filter3_field = document.querySelector('#filter3');

  // array to store the order of the input
  const order = [];

  // listen for input fields change to update the order array
  filter1_field.addEventListener('input', () => updateOrderArray('filter1'));
  filter2_field.addEventListener('input', () => updateOrderArray('filter2'));
  filter3_field.addEventListener('input', () => updateOrderArray('filter3'));

  // update the order array
  function updateOrderArray(fieldName) {
    if (!order.includes(fieldName)) {

  form.addEventListener('submit', (event) => {

    const baseUrl = 'https://example.test/form.php'; // L'URL de base
    // build the url with the GET parameters in the order specified by the order array
    let url = baseUrl;
    order.forEach((fieldName, index) => {
      const value = encodeURIComponent(document.querySelector(`#${fieldName}`).value);
      url += `${index === 0 ? '?' : '&'}${fieldName}=${value}`;

    // redirect
    window.location.href = url;


Result: /form.php?filter3=processwire&filter2=is&filter1=awesome



Edited by flydev
changed example url
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What @flydev said.

A slightly different alternative to the above is to store the order values in a hidden input as a CSV. In that case, you don't need to touch window.location.href. You would use the values in the CSV to access the GET params sequentially.

Edited by kongondo
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