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//創(chuàng)建一個(gè)監(jiān)聽器，當(dāng)你按下一個(gè)鍵時(shí)觸發(fā)
window.onkeyup = keyup;

//創(chuàng)建一個(gè)全局的Javascript變量
var inputTextValue;

function keyup(e) {
  //將你的輸入文本設(shè)置為全局的Javascript變量，每次按鍵都會(huì)更新
  inputTextValue = e.target.value;

  //監(jiān)聽你按下回車鍵，此時(shí)你的網(wǎng)址將會(huì)改變?yōu)槟阍谒阉骺蛑休斎氲木W(wǎng)址
  if (e.keyCode == 13) {
    window.location = "http://www.myurl.com/search/" + inputTextValue;
  }
}

View this feature in codepen.

There are several ways to get the value of the input text box directly (without wrapping the input element inside a form element):

method 1

document.getElementById('textbox_id').value Get the value of the required box

For example

document.getElementById("searchTxt").value;

Note: Methods 2, 3, 4 and 6 return a collection of elements, so use [integer] to get the required elements. For the first element, use [0], for the second element, use [1], and so on...

Method 2

Use document.getElementsByClassName('class_name')[integer].value, which returns a real-time HTMLCollection

For example

document.getElementsByClassName("searchField")[0].value;, if this is the first text box on the page.

Method 3

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

For example

document.getElementsByTagName("input")[0].value;, if this is the first text box on the page.

Method 4

document.getElementsByName('name')[integer].value, it also returns a real-time NodeList

For example

document.getElementsByName("searchTxt")[0].value;, if this is the first text box named 'searchtext' on the page.

Method 5

Use the powerful document.querySelector('selector').value, which uses CSS selectors to select elements

For example

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

Method 6

document.querySelectorAll('selector')[integer].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; Select by id
• document.querySelectorAll('.searchField')[0].value; Select by class
• document.querySelectorAll('input')[0].value; Select by tag name
• document.querySelectorAll('[name="searchTxt"]')[0].value; Select by name

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