i want to build a div with scroll, that when you scroll this div, it will active anothe function.
i need to build this in a Object.
there is any way to do this?
i write here an example source (that not work) of what i want.
<script type="text/javascript">
function onsc(divName, divChange) {
this.play = function() {
window.onload = function() {
document.getElementById(divName).onscroll = function() {
this.scroll(n)
}
};
}
this.scroll = function(n) {
document.getElementById(divChange).innerHTML = "you scroll!";
}
}
c[1] = new onsc("div1", "div1_i").play();
</script>
<div id="div1_i">this div will change when you scroll</div>
<div id="div1" style="background:#C6E2FF; width:300px; height:200px; overflow-y:scroll;">
<p style="height:800px;">txt</p>
</div>
Your code was nearly there. I made a few changes and put into a JSFiddle for you.
I added comments at what you missed. Most importantly the context of this changes when you entered into that function on the onscroll event.
JavaScript
function onsc(divName, divChange) {
// First of all make `this` inherit to below functions
var self = this;
this.play = function () {
document.getElementById(divName).onscroll = function() {
// Changed this to call the parent and place the correct DIV
self.scroll(divChange)
}
}
this.scroll = function (n) {
document.getElementById(divChange).innerHTML = "you scroll!";
}
}
c = new onsc("div1", "div1_i").play();
Demo
Have a look at my JSFiddle: http://jsfiddle.net/bJD8w/2/
Related
This question already has answers here:
How to add onload event to a div element
(26 answers)
Closed 5 years ago.
For an assignment, I cannot touch the HTML code and am editing an external JS file. I have to refer the code to an existing class and turn that into a button to run a script.
The has to be ran on load to transform an element with a given id into a button that can also run a function on click.
So let's say the we have id="bar",
how do I go about it?
My code doesn't work at all.
document.getElementById("bar").onload = function () { myFunction() };
function myFunction() {
document.getElementById("bar").innerHTML = "<button></button>";
}
Why don't you just execute your script as the DOM is ready? To do so,
document.addEventListener('DOMContentLoaded', function () {
document.getElementById("bar").innerHTML = "<button></button>";
}, false);
You just need a createElement function.
This works:
document.addEventListener("DOMContentLoaded", function(){
var button = document.createElement("button");
button.innerHTML = "This is a button";
// assuming the Div's ID is bar
var div = document.getElementById('bar');
div.appendChild(button);
//the following function will alert a window when the button is clicked
button.addEventListener ("click", function() {
alert("Button was clicked");
});
});
Updated Codepen
I think this is bit tha you needed
var bar = document.getElementById('bar');
window.onload = function() {
var barInner = bar.innerHTML;
bar.innerHTML = '<button>' + barInner + '</button>';
}
bar.onclick = function() {
alert("Hello\nHow are you?");
};
document.getElementById("bar").onload = myFunction();
function myFunction() {
document.getElementById("bar").innerHTML = "<button>Button</button>";
}
There you go!
Not every single HTML element has a load event.
Only some of them are concerned, such as the window, an image... etc
Have a look here on MDN to learn more about this.
Here is a simple snippet resolving all what you mentioned.
window.addEventListener("load", () => {
// you can put your entire script in here.
var elt = document.getElementById("bar"),
button = document.createElement("button");
button.textContent = elt.textContent;
button.onclick = callback;
elt.textContent = '';
elt.appendChild(button);
function callback() {
console.log("The button has been clicked");
}
});
<div id="bar" style="background: beige; height: 2em">Click me</div>
In the previous snippet, I am appending the button in the element. But if the matter is really to transform it into a button, there we go:
window.addEventListener("load", () => {
// you can put your entire script in here.
var elt = document.getElementById("bar"),
container = elt.parentNode,
button = document.createElement("button");
button.id = elt.id; // if you want to keep the id
button.textContent = elt.textContent;
button.onclick = callback;
container.removeChild(elt);
container.appendChild(button);
function callback() {
console.log("The button has been clicked");
}
});
<div style="background: #fee; height: 2em">
<div id="bar" style="background: beige; height: 2em">Click me</div>
</div>
I am creating a simple function to close a flash message div on click event, but my listener is not firing.
I wrote 3 different functions to try to get it working, but nothing is happening and Chrome console isnt telling me anything.
My first was in ES6 class style, this one:
class closeFlashMessages {
constructor () {
this.getFlashMessages = document.querySelector("#flash-messages");
this.addEventListeners();
}
close () {
console.log(this.getFlashMessages);
this.getFlashMessages.className = "hide";
}
addEventListeners () {
if(this.getFlashMessages)
this.getFlashMessages.addEventListener("click", this.close);
}
}
new closeFlashMessages();
My second was this:
(function (){
let getFlashMessages = document.querySelector("#flash-messages");
function close () {
console.log(getFlashMessages);
getFlashMessages.className = "hide";
}
function addEventListeners () {
getFlashMessages.addEventListener("click", function () {
close()
});
}
addEventListeners();
});
My last one is this:
(function (){
let getFlashMessages = document.getElementById("flash-messages");
getFlashMessages.addEventListener("click", close(getFlashMessages));
function close (id) {
console.log(getFlashMessages);
getFlashMessages.className = "hide";
}
});
My HTML:
<div id="flash-messages">
<div class="flash success">
<p>Recept byl přidán do nákupního seznamu.</p>
</div>
</div>
But none of them worked!! I dont understand
With the first two, I was getting undefined on my this.getFlashMessages also not sure why.
My solution is not in ES6
function Init(){
var id = document.getElementById('flash-messages');
var msg = document.querySelector('.flash');
id.addEventListener('click',function(){
msg.className = 'hide';
});
}
Init();
see demo here
I am not very much familiar with ES6.
But if I try similar code sample on a javascript it will be as given below and I hope it will be almost similar in ES6 aswell.
var getFlashMessages = document.getElementById("flash-messages");
getFlashMessages.addEventListener("click", function()
{
clicked(getFlashMessages);
});
function clicked(id){
console.log(id);
id.className = "hide";
}
Here, I am calling anonymous function, and its default argument will be event object as given in https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener.
I am a little new to JS / jQuery and have done a hover function so when hover a link it shows a hidden DIV area but when I go to then hover over the div area shown of course it closes. I would like that if I then go into the content area won't close but stay open but then if leave that area would close?
JS:
$('.mini-cart').hover(
function () {
cartOpen();
},
function () {
cartClose();
}
);
var overlay = $("#cart_slide");
var cartContainer = $("#cart_over");
function cartOpen() {
cartContainer.fadeIn("slow");
overlay.addClass("overlay");
}
function cartClose() {
cartContainer.fadeOut("medium");
overlay.removeClass("overlay");
}
HTML:
<a class="mini-cart">hover link</a>
<div id="cart_over" style="display:none;">testing</div>
You could introduce the usage of a flag (isCartOpen) variable which is going to control the whether the DIV should be displayed or not.
See this working JSFiddle example and find below the related code:
var isCartOpen = false;
$('.mini-cart, #cart_over').hover(
function() {
isCartOpen = true;
cartOpen();
},
function() {
isCartOpen = false;
setTimeout(cartClose, 1000); // after 1 sec
}
);
var overlay = $("#cart_slide");
var cartContainer = $("#cart_over");
function cartOpen() {
cartContainer.fadeIn("slow");
overlay.addClass("overlay");
}
function cartClose() {
if (isCartOpen)
return;
cartContainer.fadeOut("medium");
overlay.removeClass("overlay");
}
Looks like you'll need to separate your open/close functions . Look at the following:
$('.mini-cart').hover(
cartOpen();
);
// You'll need to create a close button.. ex. <div class="close-button"></div>
$(".close-button").click(function(){
cartClose();
});
I've got another JavaScript/jQuery-Problem. A minimal example could be this: I've got a div, and want some JavaScript executed, when the mouse enters. But for some reasons (= in reality, there a many divs, and for each data needs to be kept) I want to use a object as handler for the callback. Here's a small example:
function handler($thediv)
{
this.somedata = 8;
$thediv.mouseenter(function() { this.callback(); });
}
handler.prototype.callback = function()
{
alert(somedata);
}
An object is created when the document is loaded:
$(document).ready( function() {
new handler($("div"));
});
Nothing happens - except that the constructor is executed. I've tried and searched for hours now, but I can't fix this... probably too trivial?
Edit: A complete example.
<html>
<script type="text/javascript" src="jquery-1.6.js"></script>
</head>
<body>
<div>
blah blahasdasdadsssssssssssssss
asddddddddddddddddddddddddddd
</div>
</body>
<script type="text/javascript">
$(document).ready(function() {
new handler($("div"));
});
function handler($thediv)
{
this.somedata = 8;
$thediv.mouseenter(this.callback);
}
handler.prototype.callback = function()
{
alert(somedata);
}
</script>
</html>
The biggest issue here is the use of this in various contexts. Within the mouseenter function, this refers to div, not the object.
This should work:
http://jsfiddle.net/Nx5c7/
function handler($thediv)
{
this.somedata = 8;
this.theID=$thediv.attr("id");
var obj=this;
$thediv.mouseenter(function() {
obj.callback();
});
}
handler.prototype.callback = function()
{
alert(this.theID + " : " + this.somedata);
}
Can anybody help me on this one...I have a button which when is hovered, triggers an action. But I'd like it to repeat it for as long as the button is hovered.
I'd appreciate any solution, be it in jquery or pure javascript - here is how my code looks at this moment (in jquery):
var scrollingposition = 0;
$('#button').hover(function(){
++scrollingposition;
$('#object').css("right", scrollingposition);
});
Now how can i put this into some kind of while loop, so that #object is moving px by px for as #button is hovered, not just when the mouse enters it?
OK... another stab at the answer:
$('myselector').each(function () {
var hovered = false;
var loop = window.setInterval(function () {
if (hovered) {
// ...
}
}, 250);
$(this).hover(
function () {
hovered = true;
},
function () {
hovered = false;
}
);
});
The 250 means the task repeats every quarter of a second. You can decrease this number to make it faster or increase it to make it slower.
Nathan's answer is a good start, but you should also use window.clearInterval when the mouse leaves the element (mouseleave event) to cancel the repeated action which was set up using setInterval(), because this way the "loop" is running only when the mouse pointer enters the element (mouseover event).
Here is a sample code:
function doSomethingRepeatedly(){
// do this repeatedly when hovering the element
}
var intervalId;
$(document).ready(function () {
$('#myelement').hover(function () {
var intervalDelay = 10;
// call doSomethingRepeatedly() function repeatedly with 10ms delay between the function calls
intervalId = setInterval(doSomethingRepeatedly, intervalDelay);
}, function () {
// cancel calling doSomethingRepeatedly() function repeatedly
clearInterval(intervalId);
});
});
I created a sample code on jsFiddle which demonstrates how to scroll the background-image of an element left-to-right and then backwards on hover with the code shown above:
http://jsfiddle.net/Sk8erPeter/HLT3J/15/
If its an animation you can "stop" an animation half way through. So it looks like you're moving something to the left so you could do:
var maxScroll = 9999;
$('#button').hover(
function(){ $('#object').animate({ "right":maxScroll+"px" }, 10000); },
function(){ $('#object').stop(); } );
var buttonHovered = false;
$('#button').hover(function () {
buttonHovered = true;
while (buttonHovered) {
...
}
},
function () {
buttonHovered = false;
});
If you want to do this for multiple objects, it might be better to make it a bit more object oriented than a global variable though.
Edit:
Think the best way of dealing with multiple objects is to put it in an .each() block:
$('myselector').each(function () {
var hovered = false;
$(this).hover(function () {
hovered = true;
while (hovered) {
...
}
},
function () {
hovered = false;
});
});
Edit2:
Or you could do it by adding a class:
$('selector').hover(function () {
$(this).addClass('hovered');
while ($(this).hasClass('hovered')) {
...
}
}, function () {
$(this).removeClass('hovered');
});
var scrollingposition = 0;
$('#button').hover(function(){
var $this = $(this);
var $obj = $("#object");
while ( $this.is(":hover") ) {
scrollingposition += 1;
$obj.css("right", scrollingposition);
}
});