Products
Star

Local value persistence

The following example shows a two-way binding dropdown with an event to save its value on the localStorage.

Example

The value is updated on the localStorage on the dropdown changes its value.

Source code

<html>
<script src="https://lemonadejs.com/v4/lemonade.js"></script>
<div id='root'></div>
<script>
function Persistence() {
    const self = this;

    // Default value of the property which is bound to the value of the dropdown
    self.language = localStorage.getItem('language');

    // Do something when the self.language changes using the onchange lemonadeJS native tracker
    self.onchange = function() {
        // Persist language
        localStorage.setItem('language', self.language);
    }

    return `<select :bind="self.language">
        <option value="">Choose one</option>
        <option value="en_GB">English</option>
        <option value="pt_BR">Portuguese</option>
    </select>`;
}
lemonade.render(Persistence, document.getElementById('root'));
</script>
</html>

import lemonade from 'lemonadejs';

export default function Persistence() {
    const self = this;

    // Default value of the property which is bound to the value of the dropdown
    self.language = localStorage.getItem('language');

    // Do something when the self.language changes using the onchange lemonadeJS native tracker
    self.onchange = function() {
        // Persist language
        localStorage.setItem('language', self.language);
        console.log(localStorage.getItem('language'))
    }

    return `<select :bind="self.language">
        <option value="">Choose one</option>
        <option value="en_GB">English</option>
        <option value="pt_BR">Portuguese</option>
    </select>`;
}

See this example on codesandbox

Edit this page on GitHub