What is the best way to conceal an <option> within a <select> tag based on an if statement?

Question

What is the best way to conceal an <option> within a <select> tag based on an if statement?

Here is the current HTML code I have for adjusting the zoom level on a page.

I am looking for guidance on how to use JavaScript to hide the 200 zoom option based on a certain condition.

To clarify, if one variable exceeds another variable, I want to hide the 200 option and show the options for 100, 300, and 400 instead.

<div id="zoomAdjuster' class="centerAlign">
  <span>Zoom</span>
  <select name="chooseAZoom">
     <option value="100" selected>100</option>
     <option value="200">200</option>
     <option value="300">300</option>
     <option value="400">400</option>
    </select>
  </div>

I would appreciate any help or advice as I am not very familiar with this language. Thank you.

javascript html jquery css ajax

Answer 1

Answer №1

To target the select element, you can use any document query method and then access the options within it. Next, loop through each option and check if the value is greater than 200. If it meets this condition, apply a CSS class to hide it.

const zoomOptions = document.getElementsByName('chooseAZoom')[0].querySelectorAll('option').forEach((option) => {
  if (parseInt(option.value) >= 200) {
    option.classList.add('hideOption');
  }
});

.hideOption {
  display: none;
}

<div id="zoomAdjuster" class="centerAlign">
  <span>Zoom</span>
  <select name="chooseAZoom">
    <option value="100" selected>100</option>
    <option value="200">200</option>
    <option value="300">300</option>
    <option value="400">400</option>
  </select>
</div>

Answer 2

To target the select element, you can use any document query method and then access the options within it. Next, loop through each option and check if the value is greater than 200. If it meets this condition, apply a CSS class to hide it.

const zoomOptions = document.getElementsByName('chooseAZoom')[0].querySelectorAll('option').forEach((option) => {
  if (parseInt(option.value) >= 200) {
    option.classList.add('hideOption');
  }
});

.hideOption {
  display: none;
}

<div id="zoomAdjuster" class="centerAlign">
  <span>Zoom</span>
  <select name="chooseAZoom">
    <option value="100" selected>100</option>
    <option value="200">200</option>
    <option value="300">300</option>
    <option value="400">400</option>
  </select>
</div>

Answer 3

Answer №2

To eliminate the option tags from the DOM, you can follow these steps:

Start by locating the select tag in the DOM, then extract its child option tags and store them in an array using the spread syntax.
Next, sift through the array and delete the option tag with a value of 200 if your variable surpasses 200. If not, retain the array as it is.
Once the filtering is complete, erase all existing option tags within the select element, and proceed to reinsert the filtered option tags back into the select.

let yourVariable = 201;

const select = document.querySelector('select[name=chooseAZoom]');
const optArr = [...select.children];

const newOptArr = optArr.filter(opt => {
  if (yourVariable > 200)
    return opt.value != 200;
  return true;
})

select.innerHTML = "";
newOptArr.forEach(opt => select.appendChild(opt));

<div id="zoomAdjuster" class="centerAlign" >
      <span>Zoom</span>
      <select name="chooseAZoom">
       <option value="100" selected>100</option>
       <option value="200">200</option>
       <option value="300">300</option>
       <option value="400">400</option>
      </select>
</div>

Answer 4

To eliminate the option tags from the DOM, you can follow these steps:

Start by locating the select tag in the DOM, then extract its child option tags and store them in an array using the spread syntax.
Next, sift through the array and delete the option tag with a value of 200 if your variable surpasses 200. If not, retain the array as it is.
Once the filtering is complete, erase all existing option tags within the select element, and proceed to reinsert the filtered option tags back into the select.

let yourVariable = 201;

const select = document.querySelector('select[name=chooseAZoom]');
const optArr = [...select.children];

const newOptArr = optArr.filter(opt => {
  if (yourVariable > 200)
    return opt.value != 200;
  return true;
})

select.innerHTML = "";
newOptArr.forEach(opt => select.appendChild(opt));

<div id="zoomAdjuster" class="centerAlign" >
      <span>Zoom</span>
      <select name="chooseAZoom">
       <option value="100" selected>100</option>
       <option value="200">200</option>
       <option value="300">300</option>
       <option value="400">400</option>
      </select>
</div>

What is the best way to conceal an <option> within a <select> tag based on an if statement?

Answer №1

Answer №2

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