What is the best way to populate dropdown menus using JavaScript?

Question

What is the best way to populate dropdown menus using JavaScript?

I'm facing an issue with my ajax request where I am unable to populate the options of a select tag. This problem is occurring in multiple blocks where the select tag serves the purpose of choosing a type of product.

Here is how my select tag looks like:

<select class="form-control" name="type" id="select-types">
</select>

This is the ajax request I am using:

function getTypes() {
 $.ajax({
      url: `/types/json`
  }).done(function(res){
    console.log(res)
    })}

The response "res" has the following structure:

{types: [{"id":1,"name": Name}, ...]}

Imagine having 5 blocks each containing the same select element.

1. How can I only fill the last one?

2. What is the best approach to populating it correctly?

javascript

Answer 1

Answer №1

To retrieve the final element, a possible approach is to utilize the getElementsByTagName method. By iterating over each desired option within the select element, you can cycle through the list of types and generate an option for each type. Subsequently, these options can be appended to the last select.

const types = [{"id":1,"name": "Something"}, {"id":2,"name": "New Text"}];
const allSelects = document.getElementsByTagName('select');
const lastSelect = allSelects[allSelects.length - 1];

types.forEach((type) => {
  const option = document.createElement("option");

  option.value = type.id;
  option.text = type.name;
  
  lastSelect.appendChild(option)
})

Answer 2

To retrieve the final element, a possible approach is to utilize the getElementsByTagName method. By iterating over each desired option within the select element, you can cycle through the list of types and generate an option for each type. Subsequently, these options can be appended to the last select.

const types = [{"id":1,"name": "Something"}, {"id":2,"name": "New Text"}];
const allSelects = document.getElementsByTagName('select');
const lastSelect = allSelects[allSelects.length - 1];

types.forEach((type) => {
  const option = document.createElement("option");

  option.value = type.id;
  option.text = type.name;
  
  lastSelect.appendChild(option)
})

Answer 3

Answer №2

To restrict options to 5 items, simply use .slice(0, 5)
Modify the innerHTML of your select element to dynamically generate options

const fakeRequest = () => new Promise(resolve => {
  setTimeout(() => {
    resolve([
      'opt1', 'opt2', 'opt3', 'opt4', 'opt5', 'opt6', 'opt7'
    ])
  }, 1000)
})

const select = document.getElementById('select-types')

fakeRequest().then(options => {
  const showingOptions = options.slice(0, 5)
  select.innerHTML = showingOptions.map(value => `<option value='${value}'>${value}</option>`)
})

<select class="form-control" name="type" id="select-types">
</select>

Answer 4

To restrict options to 5 items, simply use .slice(0, 5)
Modify the innerHTML of your select element to dynamically generate options

const fakeRequest = () => new Promise(resolve => {
  setTimeout(() => {
    resolve([
      'opt1', 'opt2', 'opt3', 'opt4', 'opt5', 'opt6', 'opt7'
    ])
  }, 1000)
})

const select = document.getElementById('select-types')

fakeRequest().then(options => {
  const showingOptions = options.slice(0, 5)
  select.innerHTML = showingOptions.map(value => `<option value='${value}'>${value}</option>`)
})

<select class="form-control" name="type" id="select-types">
</select>

Answer 5

Answer №3

This method is effective. It involves mapping the type list to option HTML syntax and then combining them into a single string. Finally, this string is set as the innerHTML of the select element.

function fetchTypeOptions() {
 $.ajax({
      url: `/types/json`
  }).done(function(response) {
       let selectElement = document.getElementById('select-types');    
       let options = 
          response.types.map(type => `<option value=${type.id}>${type.name}</option>`)
                   .join('\n');
       selectElement.innerHTML = options;
  });
}

Answer 6

This method is effective. It involves mapping the type list to option HTML syntax and then combining them into a single string. Finally, this string is set as the innerHTML of the select element.

function fetchTypeOptions() {
 $.ajax({
      url: `/types/json`
  }).done(function(response) {
       let selectElement = document.getElementById('select-types');    
       let options = 
          response.types.map(type => `<option value=${type.id}>${type.name}</option>`)
                   .join('\n');
       selectElement.innerHTML = options;
  });
}

What is the best way to populate dropdown menus using JavaScript?

Answer №1

Answer №2

Answer №3

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