Develop Reference

JS - Add class to form when input has value

I have a form with one input field for the emailaddress. Now I want to add a class to the <form> when the input has value, but I can't figure out how to do that.
I'm using this code to add a class to the label when the input has value, but I can't make it work for the also:
function checkForInputFooter(element) {
const $label = $(element).siblings('.raven-field-label');
if ($(element).val().length > 0) {
$label.addClass('input-has-value');
} else {
$label.removeClass('input-has-value');
}
}
// The lines below are executed on page load
$('input.raven-field').each(function() {
checkForInputFooter(this);
});
// The lines below (inside) are executed on change & keyup
$('input.raven-field').on('change keyup', function() {
checkForInputFooter(this);
});
Pen: https://codepen.io/mdia/pen/gOrOWMN

This is the solution using jQuery:
function checkForInputFooter(element) {
// element is passed to the function ^
const $label = $(element).siblings('.raven-field-label');
var $element = $(element);
if ($element.val().length > 0) {
$label.addClass('input-has-value');
$element.closest('form').addClass('input-has-value');
} else {
$label.removeClass('input-has-value');
$element.closest('form').removeClass('input-has-value');
}
}
// The lines below are executed on page load
$('input.raven-field').each(function() {
checkForInputFooter(this);
});
// The lines below (inside) are executed on change & keyup
$('input.raven-field').on('change keyup', function() {
checkForInputFooter(this);
});
I've updated your pen here.

Here it is, using javascript vanilla. I selected the label tag ad form tag and added/removed the class accoring to the element value, but first you should add id="myForm" to your form html tag. Good luck.
function checkForInputFooter(element) {
// element is passed to the function ^
let label = element.parentNode.querySelector('.raven-field-label');
let myForm = document.getElementById("myform");
let inputValue = element.value;
if(inputValue != "" && inputValue != null){
label.classList.add('input-has-value');
myForm.classList.add('input-has-value');
}
else{
label.classList.remove('input-has-value');
myForm.classList.remove('input-has-value');
}
}

You can listen to the 'input' event of the input element and use .closest(<selector>) to add or remove the class
$('input').on('input', function () {
if (!this.value) {
$(this).closest('form').removeClass('has-value');
} else {
$(this).closest('form').addClass('has-value');
}
})
Edit: https://codepen.io/KlumperN/pen/xxVxdzy

How do I get my modal to close when a user clicks on the container?

I'm currently studying a full stack course and my modal isn't behaving as expected
I'm a bit lost on what to do as I can't find any documentation anywhere and while clicking on the close button or pressing ESC works, clicking outside of the box doesn't.
The following code is how it has been suggested I approach the issue but, it doesn't work. I've honestly stared at this for about an hour and just can't connect the dots on what is (not) happening? Please excuse all the commenting and additional code as I'm still learning so, it's how I'm able to follow what's going on:
function showModal() {
var $modalContainer = document.querySelector('#modal-container');
$modalContainer.classList.add('is-visible');
}
function hideModal() {
var $modalContainer = document.querySelector('#modal-container');
$modalContainer.classList.remove('is-visible');
}
//modal IFFE
document.querySelector('#modal-button').addEventListener('click', () => {
showModal();
});
//-- show modal --
function showModal(title, text) {
var $modalContainer = document.querySelector('#modal-container');
//Selects the element with the associated id
// Clear all content for the selected element
$modalContainer.innerHTML = '';
var modal = document.createElement('div'); //creates a div element withing selected element
modal.classList.add('modal'); //assigns new class to the div element
// Add the new modal content
var closeButtonElement = document.createElement('button'); //creates the close button
closeButtonElement.classList.add('modal-close'); //assigns a class to the new (close) button
closeButtonElement.innerHTML = "×"; //inserts text within the new(close) button
closeButtonElement.addEventListener('click', hideModal);
var titleElement = document.createElement('h1');
titleElement.innerText = title;
var contentElement = document.createElement('p');
contentElement.innerText = text;
modal.appendChild(closeButtonElement);
modal.appendChild(titleElement);
modal.appendChild(contentElement);
$modalContainer.appendChild(modal);
$modalContainer.classList.add('is-visible');
}
document.querySelector('#modal-button').addEventListener('click', () => {
showModal('PokéMon', 'Here is all of the info about your PokéMon');
});
window.addEventListener('keydown', (e) => {
var $modalContainer = document.querySelector('#modal-container');
if (e.key === 'Escape' && $modalContainer.classList.contains('is-
visible')) {
hideModal();
}
});
$modalContainer.addEventListener('click', (e) => {
var target = e.target;
if (target === $modalContainer) {
hideModal();
}
});
Expected result: User clicks outside of the modal (on the container) and the modal closed.
Current result: No change in state, modal remains active and visible. Only by clicking on the close button (x) or by pressing ESC is the desired result achievable.

By Looking at this code I am not sure what is actually supposed to make the modal visible or hide it. Without access to your css (if you have any). I am assuming that all you are doing is adding and removing the class .is-visible from the #modal-container element.
I would suggest that you apply this class to the modal itself, and then you could toggle this class on and off,
Modify your code to do this by doing something like this (added on top of your code):
function showModal() {
var $modalContainer = document.querySelector('#modal-container');
$modalContainer.classList.add('is-visible');
document.querySelector('.modal').classList.remove('hide-el')
}
function hideModal() {
var $modalContainer = document.querySelector('#modal-container');
$modalContainer.classList.remove('is-visible');
document.querySelector('.modal').classList.add('hide-el')
}
Where hide-el in your css is:
.hide-el {
display: none;
}
You could also modify your code to appply the is-visible class to your modal element. You should always try to attach the class/id to the element you want to manipulate if you have that option.
Or if you do not have access to a css file:
document.querySelector('.modal').style.display = "none"
and
document.querySelector('.modal').style.display = "block"
Also, your code seems very verbose, was this boilerplate part of the assignment?
heres a working example: https://codepen.io/mujakovic/pen/zVJRKG

The code was in the incorrect place in the end and should have looked something like this:
modal.appendChild(closeButtonElement);
modal.appendChild(titleElement);
modal.appendChild(contentImage);
modal.appendChild(contentHeight);
modal.appendChild(contentElement);
$modalContainer.appendChild(modal);
$modalContainer.classList.add('is-visible');
$modalContainer.addEventListener('click', (e) => { //listening for an event (click) anywhere on the modalContainer
var target = e.target;
console.log(e.target)
if (target === $modalContainer) {
hideModal();
}
});
};
window.addEventListener('keydown', (e) => { //listening for an event (ESC) of the browser window
var $modalContainer = document.querySelector('#modal-container');
if (e.key === 'Escape' && $modalContainer.classList.contains('is-visible')) {
hideModal();
}
});
This is because the action was originally being called on page load and targeted within the window instead of being called within the container and being loaded when the modal loads.
Thank for your help

Focus does not hide the hint on browser back button (jquery.hint.js)

I use jquery.hint.js. On page load everiting is fine but when i use back browser button the focus does not hide the hint.
jQuery.fn.hint = function (blurClass) {
if (!blurClass) {
blurClass = 'blur';
}
return this.each(function () {
// get jQuery version of 'this'
var $input = jQuery(this),
// capture the rest of the variable to allow for reuse
title = $input.attr('title'),
$form = jQuery(this.form),
$win = jQuery(window);
function remove() {
if ($input.val() === title && $input.hasClass(blurClass)) {
$input.val('').removeClass(blurClass);
}
}
// only apply logic if the element has the attribute
if (title) {
// on blur, set value to title attr if text is blank
$input.blur(function () {
if (this.value === '') {
$input.val(title).addClass(blurClass);
}
}).focus(remove).blur(); // now change all inputs to title
// clear the pre-defined text when form is submitted
$form.submit(remove);
$win.unload(remove); // handles Firefox's autocomplete
}
});
};
example on normal page load: http://prntscr.com/sik0d
example after using back browser button: http://prntscr.com/sikap (doses not hide the hint on focus, it just add text to input field)
how to fix this. How to force this script to reload on back button? thanks

I finally find jquery.hint.js witch includes a fix for using the browser back button. So here is a link: https://gist.github.com/madmanlear/1723896
JavaScript:
(function ($) {
$.fn.hint = function (blurClass) {
if (!blurClass) blurClass = 'blur';
return this.each(function () {
var $input = $(this),
title = $input.attr('placeholder'),
$form = $(this.form),
$win = $(window);
function remove() {
if ($input.val() === title) {
$input.val('').removeClass(blurClass);
}
}
// only apply logic if the element has the attribute
if (title) {
// on blur, set value to title attr if text is blank
$input.blur(function () {
if (this.value === '' || this.value == title) {
$input.val(title).addClass(blurClass);
}
}).focus(remove).blur(); // now change all inputs to title
// clear the pre-defined text when form is submitted
$form.submit(remove);
$win.unload(remove); // handles Firefox's autocomplete
}
});
};
})(jQuery);

Compare onclick action of two html button using javascript

I have this two HTML Form buttons with an onclick action associated to each one.
<input type=button name=sel value="Select all" onclick="alert('Error!');">
<input type=button name=desel value="Deselect all" onclick="alert('Error!');">
Unfortunately this action changes from time to time. It can be
onclick="";>
or
onclick="alert('Error!');"
or
onclick="checkAll('stato_nave');"
I'm trying to write some javascript code that verifies what is the function invoked and change it if needed:
var button=document.getElementsByName('sel')[0];
// I don't want to change it when it is empty or calls the 'checkAll' function
if( button.getAttribute("onclick") != "checkAll('stato_nave');" &&
button.getAttribute("onclick") != ""){
//modify button
document.getElementsByName('sel')[0].setAttribute("onclick","set(1)");
document.getElementsByName('desel')[0].setAttribute("onclick","set(0)");
} //set(1) and set(0) being two irrelevant function
Unfortunately none of this work.
Going back some steps I noticed that
alert( document.getElementsByName('sel')[0].onclick);
does not output the onclick content, as I expected, but outputs:
function onclick(event) {
alert("Error!");
}
So i guess that the comparisons fails for this reason, I cannot compare a function with a string.
Does anyone has a guess on how to distinguish which function is associated to the onclick attribute?

This works
http://jsfiddle.net/mplungjan/HzvEh/
var button=document.getElementsByName('desel')[0];
// I don't want to change it when it is empty or calls the 'checkAll' function
var click = button.getAttribute("onclick");
if (click.indexOf('error') ) {
document.getElementsByName('sel')[0].onclick=function() {setIt(1)};
document.getElementsByName('desel')[0].onclick=function() {setIt(0)};
}
function setIt(num) { alert(num)}
But why not move the onclick to a script
window.onload=function() {
var button1 = document.getElementsByName('sel')[0];
var button2 = document.getElementsByName('desel')[0];
if (somereason && someotherreason) {
button1.onclick=function() {
sel(1);
}
button2.onclick=function() {
sel(0);
}
}
else if (somereason) {
button1.onclick=function() {
alert("Error");
}
}
else if (someotherreason) {
button1.onclick=function() {
checkAll('stato_nave')
}
}
}

Try casting the onclick attribute to a string. Then you can at least check the index of checkAll and whether it is empty. After that you can bind those input elements to the new onclick functions easily.
var sel = document.getElementsByName('sel')[0];
var desel = document.getElementsByName('desel')[0];
var onclick = sel.getAttribute("onclick").toString();
if (onclick.indexOf("checkAll") == -1 && onclick != "") {
sel.onclick = function() { set(1) };
desel.onclick = function() { set(0) };
}
function set(number)
{
alert("worked! : " + number);
}
working example: http://jsfiddle.net/fAJ6v/1/
working example when there is a checkAll method: http://jsfiddle.net/fAJ6v/3/

Toggle dropdownlist enable and disable with a button click using Javascript?

I have the following JavaScript to disable a dropdownlist in a ASP.NET page, which gets called when I click a button.
function disableDropDown(DropDownID)
{
document.getElementById(DropDownID).disabled = true;
return false;
}
I wanted to use the same button to toggle between enable and disable for that dropdownlist. How do I do this?

You just have to invert the boolean disabled attribute:
function toggleDisableDropDown(dropDownID) {
var element = document.getElementById(dropDownID); // get the DOM element
if (element) { // element found
element.disabled = !element.disabled; // invert the boolean attribute
}
return false; // prevent default action
}

function toggleDisableDropDown(DropDownID)
{
var sel = document.getElementById(DropDownID);
sel.disabled = !sel.disabled;
return false;
}