How do I use a alert to stop a link from going to the page? I've been trying to figure it out but it's sending me to the link anyways
<!DOCTYPE HTML>
<html>
<head>
<title>Do Not Click</title>
<meta charset="UTF-8" />
</head>
<body>
<script type="text/javascript">
function confirm_alert(node) {
return confirm("STOP CLICKING THE LINK");
}
</script>
Don't click link
</body>
</html>
Just return false from the confirm_alert function.
<!DOCTYPE HTML>
<html>
<head>
<title>Do Not Click</title>
<meta charset="UTF-8" />
</head>
<body>
<script type="text/javascript">
function confirm_alert(node) {
confirm("STOP CLICKING THE LINK");
return false;
}
</script>
Don't click link
</body>
</html>
You can pass the param event and execute the function .preventDefault()
<!DOCTYPE HTML>
<html>
<head>
<title>Do Not Click</title>
<meta charset="UTF-8" />
</head>
<body>
<script type="text/javascript">
function confirm_alert(node, e) {
e.preventDefault();
return confirm("STOP CLICKING THE LINK");
}
</script>
Don't click link
</body>
</html>
A better approach is binding the event click:
document.querySelector('a').addEventListener('click', confirm_alert);
function confirm_alert(e) {
e.preventDefault();
return confirm("STOP CLICKING THE LINK");
}
Don't click link
Put the redirect in the js function. Put a check in it for showing the alert or for going to the url.
Something like this:
window.location.href = "http://stackoverflow.com";
Not sure tho. Not tested it.
Related
I was learning javascript and experimenting with mouse events. In this code I am trying to manipulate the element when I put the mouse over it with the help of an alert box. However the problem is that the alert box is shown even when the mouse is not over the element.
<!DOCTYPE html>
<html>
<head>
<title>testing</title>
</head>
<body>
<a>dasdasd</a>
<p id="k">as</p>
<script type="text/javascript">
document.getElementById("k").onmouseover=alert('Hello');
</script>
</body>
</html>
The property onmouseover expect that you assing a function to it, instead you are assigning the evaluation of an expression, in this case: alert("hello"). So when the document loads, it evaluate that expression and the alert is shown, then a null value is assigned to the onmouseover property, that is the reason the alert only shows once.
For your goal, you can use an anonymous function to wrap the alert and assing it to the property. Check the next example:
<!DOCTYPE html>
<html>
<head>
<title>testing</title>
</head>
<body>
<a>dasdasd</a>
<p id="k" style="border: 1px solid red">as</p>
<script type="text/javascript">
document.getElementById("k").onmouseover = function() {alert('Hello')};
</script>
</body>
</html>
You need to put it in a function like so.
<!DOCTYPE html>
<html>
<head>
<title>testing</title>
</head>
<body>
<a>dasdasd</a>
<p id="k">as</p>
<script type="text/javascript">
document.getElementById("k").onmouseover = function(){alert('Hello')};
</script>
</body>
</html>
try to add onmouseover="mouseover()" in <p>
function mouseover() {
alert('Hello');
}
<!DOCTYPE html>
<html>
<head>
<title>testing</title>
</head>
<body>
<a>dasdasd</a>
<p id="k" onmouseover="mouseover()">as</p>
<script type="text/javascript">
function mouseover() {
alert('Hello');
}
</script>
</body>
</html>
The issue is, the () after the alert function causes the function invocation on page load and you see the alert. Call the function inside of an anonymous function which will ensure that the function will be called only when the event (onmouseover) is fired:
document.getElementById("k").onmouseover = function(){alert('Hello')};
<a>dasdasd</a>
<p id="k">as</p>
Try this (with JQuery):
$(document).ready(function(){
$("p").mouseover(function(){
alert("Hello");
});
});
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
</head>
<body>
<p>Move the mouse pointer over this paragraph.</p>
</body>
</html>
What is diffrent between these syntax please Explain in details?
$(document).on("click", "#index1", function() {
$(p).hide();
});
$("#index2").on("click", "#index1", function() {
$(p).hide();
});
$("#index1").on("click", function() {
$(p).hide();
});
In first case you add click listener to "document", but it be executed only if you click at "#index1".
In second - you add listener to "index2" and it will be executed only if you click at "#index1" located inside of "#index2".
In the third case you just add listener to "index1"
Lets imagine a webpage at first.
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<button id='index1'>click me</button>
</body>
</html>
This will work
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<button id='index1'>click me</button>
<script type="text/javascript">
$("#index1").on("click", function () {
$(p).hide();
});
</script>
</body>
</html>
This won't work, because the element did not exist while the script was executed.
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
$("#index1").on("click", function () {
$(p).hide();
});
</script>
<button id='index1'>click me</button>
</body>
</html>
But with a workaround, it would
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
$(document).on("click", "#index1", function() {
$(p).hide();
});
</script>
<button id='index1'>click me</button>
</body>
</html>
This says whenever a click event is fired on the document check if the click was fired on #index1 element. So even if, the element did not exist the callback, is attached to the document node. Now whenever a click is fired on the document it will check if it originated from #index1
How can I pass argument to function redirect in JavaScript
Here is my code:
<script type="text/javascript">
<!--
function redirectlink(text){
window.location = "index.php?keyName="+ text;
}
//-->
</script>
<form>
<button type="button" id="butt_1" onclick="redirectlink(KEY_POWER)"> 1 </button>
Thank you in advance.
This can be done either by using getElementById and addEventListener
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<button id="foo">Click</button>
<script type="text/javascript">
document.getElementById("foo").addEventListener("click", function(){
window.location.replace("http://stackoverflow.com/q/36933820/5526354")
})
</script>
</body>
</html>
either onclick
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<button id="foo" onclick="action()">Click</button>
<script type="text/javascript">
function action(){
window.location.replace("http://stackoverflow.com/q/36933820/5526354")
}
</script>
</body>
</html>
Using onclick is deprecated.
With just only JavaScript (without jQuery / Angular etc.) you can use addEventListener on click event.
for example:
var btn = document.getElementById('butt_1');
btn.addEventListener('click', function(e) {
// your code
});
In this function you can for example get value/txt from this button element and something else which you want.
hi2all i write code which change the color of webpage when the user click the div
but doesn't work here is my code what's wrong with it
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="content-type" content="text/html" />
<meta name="author" content="gencyolcu" />
<title>Untitled 1</title>
<script type="text/javascript">
var x=document.getElementById("m");
x.addEventListener("click",function{
document.body.style.backgroundColor = "red";
});
</script>
</head>
<body >
<div id="m">kfjgflg</div>
</body>
</html>
You should use something such as:
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="content-type" content="text/html" />
<meta name="author" content="gencyolcu" />
<title>Untitled 1</title>
</head>
<body>
<div id="m">kfjgflg</div>
<script type="text/javascript">
var x=document.getElementById("m");
x.addEventListener("click",function(){
document.body.style.backgroundColor = "red";
});
</script>
</body>
</html>
Because you have two problems in your original code:
Is missing a important () after the token "function".
The Javascript only recognizes a element after the page or element has ready. In this case, the element only is read to be recognized if your code has after the Javascript Codes that recognizes it.
The code above fixes this.
A important observation: In some IE's, this code can not work, because of the use of x.addEventListener, in this case, you can transform the anonymous function in a normal function (with a name) and listen with addEventListener (if available) and onclick (recommended for old IE's).
In this way,the code looks like:
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="content-type" content="text/html" />
<meta name="author" content="gencyolcu" />
<title>Untitled 1</title>
</head>
<body>
<div id="m">kfjgflg</div>
<script type="text/javascript">
function changeColor(){
document.body.style.backgroundColor = "red";
}
var x=document.getElementById("m");
if(!!x.addEventListener){ //If exists
x.addEventListener("click", changeColor);
}
x.onclick = changeColor; //It's a property, and ALWAYS can be set (but in some cases is not recognized)
</script>
</body>
</html>
Here is a working example with this code: http://jsfiddle.net/fjorgemota/qCXH3/
If you had opened your JavaScript error console it would have told you that you cannot access the property/method addEventListener of undefined.
You need to look for the element m after the DOM tree has been built. Either place into a function which gets called on DOMContentLoaded:
document.addEventListener('DOMContentLoaded', function() {
/* ... */
}, false);
or place your script at the end of your <body>.
I got a problem with JavaScript.
I want a script that will pop-up on exit whole web-site a message with question and if visitor answers "NO" web page closes and if he answers "YES" he will be redirected to another page. I found a example at http://www.pgrs.net/2008/01/30/popup-when-leaving-website/ but it seems that it doesnt work for me. I couldnt find any solution.
Pleae check my code and tell me maybe i'm doing something wrong ?
Here`s my source code.
Maybe somebody will see a problem.
<!DOCTYPE html>
<html lang="lt">
<head>
<meta charset="utf-8">
<title>PUA.LT</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="description" content="">
<meta name="author" content="Perfect WEB Solutions">
<link rel="stylesheet" href="<?php echo base_url("additional/style.css") ?>">
<script src='<?php echo base_url("additional/prototype.js")?>' type='text/javascript' ></script>
</head>
<body>
<script type="text/javascript">
Event.observe(document.body, 'click', function(event) {
if (Event.element(event).tagName == 'A') {
staying_in_site = true;
}
});
window.onunload = popup;
function popup() {
if(staying_in_site) {
return;
}
alert('I see you are leaving the site');
}
</script>
</body>
</html>
Try this:
window.onbeforeunload = popup;
function popup() {
return 'I see you are leaving the site';
}