How do I get the value of text input field using JavaScript?

//creates a listener for when you press a key
window.onkeyup = keyup;

//creates a global Javascript variable
var inputTextValue;

function keyup(e) {
  //setting your input text to the global Javascript Variable for every key press
  inputTextValue = e.target.value;

  //listens for you to press the ENTER key, at which point your web address will change to the one you have input in the search box
  if (e.keyCode == 13) {
    window.location = "http://www.myurl.com/search/" + inputTextValue;
  }
}

See this functioning in codepen.

There are various methods to get an input textbox value directly (without wrapping the input element inside a form element):

Method 1

document.getElementById('textbox_id').value to get the value of desired box

For example

document.getElementById("searchTxt").value;

  Note: Method 2,3,4 and 6 returns a collection of elements, so use [whole_number] to get the desired occurrence. For the first element, use [0], for the second one use [1], and so on...

Method 2

Use document.getElementsByClassName('class_name')[whole_number].value which returns a Live HTMLCollection

For example

document.getElementsByClassName("searchField")[0].value; if this is the first textbox in your page.

Method 3

Use document.getElementsByTagName('tag_name')[whole_number].value which also returns a live HTMLCollection

For example

document.getElementsByTagName("input")[0].value;, if this is the first textbox in your page.

Method 4

document.getElementsByName('name')[whole_number].value which also >returns a live NodeList

For example

document.getElementsByName("searchTxt")[0].value; if this is the first textbox with name 'searchtext' in your page.

Method 5

Use the powerful document.querySelector('selector').value which uses a CSS selector to select the element

For example

• document.querySelector('#searchTxt').value; selected by id
• document.querySelector('.searchField').value; selected by class
• document.querySelector('input').value; selected by tagname
• document.querySelector('[name="searchTxt"]').value; selected by name

Method 6

document.querySelectorAll('selector')[whole_number].value which also uses a CSS selector to select elements, but it returns all elements with that selector as a static Nodelist.

For example

• document.querySelectorAll('#searchTxt')[0].value; selected by id
• document.querySelectorAll('.searchField')[0].value; selected by class
• document.querySelectorAll('input')[0].value; selected by tagname
• document.querySelectorAll('[name="searchTxt"]')[0].value; selected by name

Support

Useful links

1. To see the support of these methods with all the bugs including more details click here
2. Difference Between Static collections and Live collections click Here
3. Difference Between NodeList and HTMLCollection click Here