{
if (!/[0-9]/.test(event.key)) {
event.preventDefault();
}
}}
/>
Here is what the above code is Doing:
1. We’re using the onKeyPress event handler to listen for key presses.
2. We’re using a regular expression to test the key that was pressed.
3. If the key that was pressed is not a number, we’re preventing the default behavior.
yourstring.replace(/\w/, c => c.toUpperCase()) Here is what the above code is Doing: 1. The replace() method searches a string for a specified value, or a regular expression, and returns a new string where the specified values are replaced. 2. The first argument of the replace() method is the regular expression. 3. The second argument of…
moment().format(‘HH:mm:ss’) Here is what the above code is Doing: 1. We’re importing the datetime module. 2. We’re creating a variable called now and setting it equal to datetime.datetime.now(). 3. We’re creating a variable called current_time and setting it equal to now.strftime(“%H:%M:%S”). 4. We’re printing the current time to the console.
let parent = document.createElement(“div”) parent.append(“Some text”) console.log(parent.textContent) // “Some text” Here is what the above code is Doing: 1. Create a new div element 2. Add some text to the div 3. Log the text content of the div to the console The textContent property is a string that contains all of the text inside…
// Get the Balance of an address on the Ropsten Ethereum TestNet const Web3 = require(‘web3’); const infuraProjectId = “”; const ropstenAddress = “”; const web3 = new Web3(new Web3.providers.HttpProvider( ‘https://ropsten.infura.io/v3/’ + infuraProjectId )); web3.eth.getBalance( ropstenAddress ).then(console.log); // REFERENCES: // https://blog.infura.io/getting-started-with-infura-28e41844cc89/ Here is what the above code is Doing: 1. We’re importing the Web3 library….
$this.closest(‘form’).on(‘reset.autoNumeric’, function () { holder = getHolder($this); if (holder) { $this.autoNumeric(‘wipe’); var reSet = function() { $this.autoNumeric(‘set’, $this.val()); }; setTimeout(reSet, 100); } }); Here is what the above code is Doing: 1. It’s adding a listener to the form’s reset event. 2. When the form is reset, it wipes the autoNumeric value. 3. Then it…
var optionExists = ($(‘#columnsAvailable option[value=’ + $(this).val() + ‘]’).length > 0); if(!optionExists) { $(‘#columnsAvailable’).append(“”+$(this).text()+””); } Here is what the above code is Doing: 1. It’s checking if the option exists in the other select box. 2. If it doesn’t exist, it’s appending it to the other select box. Now, we need to do the same…