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How to prevent a click on a '#' link from jumping to top of page?
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Closed 2 years ago.
I'm student and it hasn't been long since I studied programming.
below code is simplified than real for explain.
'test()' is actually Ajax function to get data.
My goal is making 'a tag' for paging operation.
But when i clicked 'a tag', 'test()' inside of '$(document).ready' is called after 'a tag' click event occurred.
So page is always back to 1.
I don't know why this happen.
Anyone could help me?
Thank you!
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script type="text/javascript">
var page = 1;
$(document).ready(function(){
test();
alert(page);
});
function test(){
for(var i = 1; i <= 3; i++) {
var a = $("<a></a>").text(i).attr({
href: "",
idx: i
});
a.preventDefault;
$(a).click(function(){
page = $(this).attr("idx");
test();
alert(page);
});
$("#pageLink").append(a," ");
}
}
</script>
</head>
<body>
hello!
<div id="pageLink"></div>
</body>
</html>
For some reason you're calling test() inside of test(). There are a few minor things you need to change also
Prefix jQuery objects with $. var $a=... to avoid ambiguity.
preventDefault is used on the event, not the jQuery object. $a.click(function(event){event.preventDefault();...});
Otherwise it works as I believe you want it to, alerting the page number on click.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
createLinks();
});
function createLinks(){
for(var i = 1; i <= 3; i++) {
var $a = $("<a></a>").text(i).attr({
href: "",
idx: i
});
$a.click(function(event){
event.preventDefault();
page = $(this).attr("idx");
// why are you calling this again? // test();
// maybe you want to load something // loadSomething(page);
alert(page);
});
$("#pageLink").append($a," ");
}
}
</script>
</head>
<body>
hello!
<div id="pageLink"></div>
</body>
</html>
Related
I have the following code:
HTML
<head>
<meta property="article:section" content="Pop or Not" />
</head>
JS
<script>
jQuery(document).ready( function($) {
var metaSection $("meta[property='article:section']").attr("content");
if (metaSection.indexOf('Pop or Not') >= 0){
alert ('The is Pop Page!');
}
});
</script>
The problem is that I think I need to that in order to use the variable I've defined I need to convert it into a string. Would definitely like some input.
This should work if HTML is ok
var metaSection = $("meta[property='article:section']").attr("content");
if (metaSection.indexOf('Pop') >= 0) {
alert('The is Pop Page!');
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<head>
<meta property="article:section" content="Pop" />
</head>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Close window</title>
</head>
<body>
<button id="abc" onclick="temp1()">button</button>
<script type="text/javascript">
function temp1() {
alert("temp1");
};
function temp2() {
alert("temp2");
}
document.getElementById("abc").addEventListener("click", temp2, false);
</script>
</body>
</html>
but I want to show "temp2" first, and then show "temp1"
Is that possible? or the event execution order depends on the browser so I can't change it?
thanks for help!!
Please review this one:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Close window</title>
</head>
<body>
<!-- here is your first AddEventlistener-->
<button id="abc" onclick="temp1()">button</button>
<script type="text/javascript">
function temp1() {
alert("temp1");
};
function temp2() {
alert("temp2");
}
/*then here is your second AddEventlistener*/
var d = document.getElementById("abc");
d.addEventListener("click", temp2, false);
/*javascript will execute it in order
if you want to change the order. remove first EventListener then register new one after. something like this:
*/
//remove listener
d.onclick = null;
//register new
d.addEventListener('click', temp1);
</script>
</body>
</html>
There are a couple of ways in which you can guarantee the order here:
document.getElementById("abc").addEvenListener("click", function() {
temp2();
temp1();
}, false);
Another option would be:
function temp2() {
alert();
temp1(); // call temp1 at the end of temp2
}
document.getElementById("abc").addEventListener("click", temp2, false);
I'm new to JS and HTML. I learned that it's possible to name a variable by code. So i tried some simple variable naming code. However, it doesn't print anything on the page.
What seems to be the problem?
javascript
for (var i = 0; i < 10; i++) {
window['var' + i] = i;
}
document.getElementById("text").innerHTML = "" + var8;
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<script src="JScript.js"></script>
<title>Practice</title>
</head>
<body>
<p><span id="text"></span>left</p>
</body>
</html>
Enclose your javascript code in below document.ready function, so that it will execute only when your page is ready.
$(document).ready(function () {
// enter your code here
});
My task for my Javascript class is to create a script for this page that changes the image every 3 seconds. I think my code is correct, however Firebug tells me "document.getElementByID is not a function." Can someone show me what I am doing incorrectly?
This is my JS script.
<script type="text/javascript">
var i = 0
var lightArray = ["pumpkinOff.gif", "pumpkinOn.gif"]
var currentLight = document.getElementByID('light')
// ChangeLight Method Prototype
function changeLight() {
currentLight.src = lightArray[i++];
if (i == lightArray.length) {
i = 0;
}
}
setInterval(changeLight, 3000)
</script>
Here is my edited HTML code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript for Programmers</title>
</head>
<body>
<h2>Happy Halloween!</h2>
<img id="pumpkin" src="pumpkinoff.gif" alt="pumpkin">
<script src="../Script/spooky.js"></script>
</body>
</html>
Incorrect capitalisation on
var currentLight = document.getElementByID('light')
Should be:
var currentLight = document.getElementById('pumpkin')
I have attached a working fiddle:
http://jsfiddle.net/11csf4k2/
It's a typo it should be:
var currentLight = document.getElementById('light'); //Not ID
It should be Id not ID:
document.getElementById('light');
Also note that you don't have element with id light on your page. It probably should be
document.getElementById('pumpkin');
this is shan and i'm a javascript noob and i'm trying to work qa code as an example here. i'm trying to load a small javascript content to a div element but it is not working any help would be great and here is the code.
<html>
<head>
<title>
using d for statement
</title>
<script>
function displaytext () {
var loopindex=0;
var sum=0;
for (var loopindex=1; loopindex <=100; loopindex++) {
sum +=loopindex;
};
document.getElementById('targetdiv').innerhtml="adding 1 to 100 gives "+sum;
}
</script>
</head>
<body>
<div id="targetdiv">
</div>
</body>
</html>
You need to call the function. It's also a good idea to wait until the window is loaded (or you can use some more advanced JS to detect the DOM ready state.):
<html>
<head>
<title>
using d for statement
</title>
<script>
function displaytext() {
var loopindex=0;
var sum=0;
for (var loopindex=1; loopindex <=100; loopindex++) {
sum +=loopindex;
};
document.getElementById('targetdiv').innerHTML = "adding 1 to 100 gives "+sum;
}
window.onload = function(){
displaytext();
}
</script>
</head>
<body>
<div id="targetdiv">
</div>
</body>
</html>
3 problems:
You never actually call the function. It is only declared.
The property is innerHTML not innerhtml. Javascript is case-sensitive.
The script is above an element is is referencing. As scripts are executed as they are found (page construction is paused during execution) the element you are referring to is never found.
Also you declare the loopindex variable twice, which i think will cause a syntax error on ES5 strict.
<html>
<head>
<title>
using d for statement
</title>
</head>
<body>
<div id="targetdiv">
</div>
</body>
<script>
function displaytext () {
var sum=0;
for (var loopindex=1; loopindex <=100; loopindex++) {
sum +=loopindex;
};
document.getElementById('targetdiv').innerHTML="adding 1 to 100 gives "+sum;
}
displaytext();
</script>
</html>