How do I save HTML form field values to localStorage using JavaScript?

Question

I need to get data from an HTML form and store them at localStore, but I'm running into some problems while attempting to tho this.

Let's make a short example:

<form class="w3-container" id="form"> 
<p><label>Name</label><input class="w3input" type="text" id="name"></p>
<p><label>Adress</label><input class="w3-input" type="text" id="adress"></p>
<p><label>Number</label><input class="w3-input" type="text" id="number"></p>
<button class="w3-button w3-blue">Submit</button>
</form>

Then JavaScript code:

localStorage.setItem("name", document.getElementById("name").value);
localStorage.setItem("adress", document.getElementById("adress").value);
localStorage.setItem("number", document.getElementById("number").value);

I have tried a different number of ways to do this but nothing seems to work. What am I missing?

Code seems incomplete. If you are storing the data in localStorage, you need to have onclick attribute on the Submit button. — krsna
– krsna, Commented Jan 19, 2019 at 2:18

krsna · Accepted Answer · 2019-01-19 02:21:43Z

1

If you're trying to store the data in localStorage when Submit button is clicked, your code should be as follows.

function onSubmit() {
  localStorage.setItem("name", document.getElementById("name").value);
  localStorage.setItem("adress", document.getElementById("adress").value);
  localStorage.setItem("number", document.getElementById("number").value);
}

<form class="w3-container" id="form">
  <p><label>Name</label><input class="w3input" type="text" id="name"></p>
  <p><label>Adress</label><input class="w3-input" type="text" id="adress"></p>
  <p><label>Number</label><input class="w3-input" type="text" id="number"></p>
  <button class="w3-button w3-blue" onclick="onSubmit()">Submit</button>
</form>

answered Jan 19, 2019 at 2:21

krsna

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2 Comments

Oguntoye Over a year ago

I believe you should avoid using inline javascript (unless you're using a framework e.g react). you should bind the form element to a variable in an external javascript file (or within script tags) then, listen for the submit event on the form element, then grab and save the values you want.

krsna Over a year ago

Glad for the knowledge share. I've seen this post which was posted as an answer from other user, better explains the difference between usage of onclick and addEventListener. @Oguntoye

Oguntoye · Accepted Answer · 2019-01-19 02:57:54Z

1

Within <script></script> tags or an external js file,

Get the form element: const form = document.getElementById('form');

Add a listener to listen for the submit event and save your values:

form.addEventListener('submit', () => {
  localStorage.setItem("name", document.getElementById("name").value);
  localStorage.setItem("adress", document.getElementById("adress").value);
  localStorage.setItem("number", document.getElementById("number").value);
})

You should avoid using inline javascript (unless you're using a framework e.g react (then it's not even really inline)).

answered Jan 19, 2019 at 2:57

Oguntoye

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Comments

user7069368 · Accepted Answer · 2019-01-19 02:30:36Z

0

Alternatively you could add an Event Listener.
addEventListener vs onclick

answered Jan 19, 2019 at 2:30

user7069368

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