Tips for showing a value in an input text box

Question

Tips for showing a value in an input text box

Imagine you have a select tag with multiple options. You want to display a specific value in the input field below when a user selects one of the options.

<select name="cars" id="cars">
  <option value="volvo">Volvo-100</option>
  <option value="saab">Saab-200</option>
  <option value="mercedes">Mercedes-300</option>
  <option value="audi">Audi-400</option>
</select>
<input type="text" id="name" name="name">

If Volvo is selected, the input field should display the value 100. If Audi is selected, the input field should display the value 400. I am in need of assistance with this, can someone please help me?

javascript html css

Answer 1

Answer №1

Feel free to reference this solution for your query.

element.options and element.selectedIndex are the key elements to achieve the desired outcome. You can find more information by visiting this link

const select = document.querySelector('#cars');
const input = document.querySelector('#name');

select.addEventListener('change', function(e) {
  const option = this.options[this.selectedIndex];
  const value = option.text.split('-')[1];
  input.value = value;
})

<!DOCTYPE html>
<html lang="en>
<head>
<title>Title</title>
    <body>
        <select name="cars" id="cars">
            <option value="volvo">Volvo-100</option>
            <option value="saab">Saab-200</option>
            <option value="mercedes">Mercedes-300</option>
            <option value="audi">Audi-400</option>
        </select>
        <input type="text" id="name" name="name" value="100">
</body>
</html>

Answer 2

Feel free to reference this solution for your query.

element.options and element.selectedIndex are the key elements to achieve the desired outcome. You can find more information by visiting this link

const select = document.querySelector('#cars');
const input = document.querySelector('#name');

select.addEventListener('change', function(e) {
  const option = this.options[this.selectedIndex];
  const value = option.text.split('-')[1];
  input.value = value;
})

<!DOCTYPE html>
<html lang="en>
<head>
<title>Title</title>
    <body>
        <select name="cars" id="cars">
            <option value="volvo">Volvo-100</option>
            <option value="saab">Saab-200</option>
            <option value="mercedes">Mercedes-300</option>
            <option value="audi">Audi-400</option>
        </select>
        <input type="text" id="name" name="name" value="100">
</body>
</html>

Answer 3

Answer №2

If you want a simple way to achieve this, you can utilize the change event listener. Make sure to update the value attribute of each option to match the values you specified in your initial question. The selected option can be accessed using event.target.value.

Here's an example implementation:

const selectElement = document.querySelector('#cars');
const textInputElement = document.querySelector('#name');

selectElement.addEventListener('change', event => {
  textInputElement.value = event.target.value;
});

<select name="cars" id="cars">
  <option value="100">Volvo</option>
  <option value="200">Saab</option>
  <option value="300">Mercedes</option>
  <option value="400">Audi</option>
</select>
<input type="text" id="name" name="name">

Additional resources:

https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/change_event

https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener

Answer 4

If you want a simple way to achieve this, you can utilize the change event listener. Make sure to update the value attribute of each option to match the values you specified in your initial question. The selected option can be accessed using event.target.value.

Here's an example implementation:

const selectElement = document.querySelector('#cars');
const textInputElement = document.querySelector('#name');

selectElement.addEventListener('change', event => {
  textInputElement.value = event.target.value;
});

<select name="cars" id="cars">
  <option value="100">Volvo</option>
  <option value="200">Saab</option>
  <option value="300">Mercedes</option>
  <option value="400">Audi</option>
</select>
<input type="text" id="name" name="name">

Additional resources:

https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/change_event

https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener

Answer 5

Answer №3

Utilize addEventListener function
If the text is present, divide it into parts
Include an additional 0 option to enable selecting Volvo from the beginning
Avoid naming a field name as it is already used elsewhere in the DOM and does not represent a name

document.getElementById("cars").addEventListener("change", function() {
  const text = this.options[this.selectedIndex].text
  const value = this.selectedIndex > 0 ? text.split("-")[1] : "";
  document.getElementById("carNumber").value = value;

})

<select name="cars" id="cars">
  <option value="">Please select</option>
  <option value="volvo">Volvo-100</option>
  <option value="saab">Saab-200</option>
  <option value="mercedes">Mercedes-300</option>
  <option value="audi">Audi-400</option>
</select>
<input type="text" id="carNumber" name="carNumber">

Answer 6

Utilize addEventListener function
If the text is present, divide it into parts
Include an additional 0 option to enable selecting Volvo from the beginning
Avoid naming a field name as it is already used elsewhere in the DOM and does not represent a name

document.getElementById("cars").addEventListener("change", function() {
  const text = this.options[this.selectedIndex].text
  const value = this.selectedIndex > 0 ? text.split("-")[1] : "";
  document.getElementById("carNumber").value = value;

})

<select name="cars" id="cars">
  <option value="">Please select</option>
  <option value="volvo">Volvo-100</option>
  <option value="saab">Saab-200</option>
  <option value="mercedes">Mercedes-300</option>
  <option value="audi">Audi-400</option>
</select>
<input type="text" id="carNumber" name="carNumber">

Answer 7

Answer №4

To achieve this functionality, you can utilize the following code snippet:

const [vehicles, model] = ['vehicles', 'model'].map(document.getElementById.bind(document));

vehicles.addEventListener('change', ({
    target: {
      selectedOptions: {
        0: option
      }
    }
  }) => model.value = option.innerText.split('-')[1]);

<select name="vehicles" id="vehicles">
  <option value="toyota">Toyota-Camry</option>
  <option value="honda">Honda-Accord</option>
  <option value="ford">Ford-Explorer</option>
  <option value="chevrolet">Chevrolet-Impala</option>
</select>
<input type="text" id="model" name="model">

Answer 8

To achieve this functionality, you can utilize the following code snippet:

const [vehicles, model] = ['vehicles', 'model'].map(document.getElementById.bind(document));

vehicles.addEventListener('change', ({
    target: {
      selectedOptions: {
        0: option
      }
    }
  }) => model.value = option.innerText.split('-')[1]);

<select name="vehicles" id="vehicles">
  <option value="toyota">Toyota-Camry</option>
  <option value="honda">Honda-Accord</option>
  <option value="ford">Ford-Explorer</option>
  <option value="chevrolet">Chevrolet-Impala</option>
</select>
<input type="text" id="model" name="model">

Answer 9

Answer №5

Here's how you can solve this problem:

function extractCarName(sel) {
  document.getElementById("name").value = sel.options[sel.selectedIndex].text.split('-')[1]
}

<select name="cars" id="cars" onChange="extractCarName(this);">
  <option value="volvo">Volvo-100</option>
  <option value="saab">Saab-200</option>
  <option value="mercedes">Mercedes-300</option>
  <option value="audi">Audi-400</option>
</select>

<input type="text" id="name" name="name">

Answer 10

Here's how you can solve this problem:

function extractCarName(sel) {
  document.getElementById("name").value = sel.options[sel.selectedIndex].text.split('-')[1]
}

<select name="cars" id="cars" onChange="extractCarName(this);">
  <option value="volvo">Volvo-100</option>
  <option value="saab">Saab-200</option>
  <option value="mercedes">Mercedes-300</option>
  <option value="audi">Audi-400</option>
</select>

<input type="text" id="name" name="name">

Answer 11

Answer №6

You are facing a conflict with identifiers.

I decided to replace the id="name" with xname and included an onchange event as well.

  <select name="cars" id="cars" onchange="xname.value=this.value;">
      <option value="volvo">Volvo-100</option>
      <option value="saab">Saab-200</option>
      <option value="mercedes">Mercedes-300</option>
      <option value="audi">Audi-400</option>
    </select>
    
    
    <input type="text" id="xname" name="name" value="abc">

Answer 12

You are facing a conflict with identifiers.

I decided to replace the id="name" with xname and included an onchange event as well.

  <select name="cars" id="cars" onchange="xname.value=this.value;">
      <option value="volvo">Volvo-100</option>
      <option value="saab">Saab-200</option>
      <option value="mercedes">Mercedes-300</option>
      <option value="audi">Audi-400</option>
    </select>
    
    
    <input type="text" id="xname" name="name" value="abc">

Tips for showing a value in an input text box

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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