Jquery change() not working - javascript

Hi everyone I am new to jquery. I am facing a problem with change function I jquery
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$("input").change(function(){
alert("The text has been changed.");
});
</script>
</head>
<body>
<input type="text">
<p>Write something in the input field, and then press enter or click outside the field.</p>
</body>
</html>
I am not getting an alert box when I press it outside the textbox. Please help me to resolve this issue :D

You are trying to add a change handler to an element before it is added to the dom. You can use dom ready callback to delay the script execution till all the elements are loaded to the dom
jQuery(function($){
$("input").change(function(){
alert("The text has been changed.");
});
})
Demo: Fiddle

you can also try this :
$(function() {
$("input").change(function(){
alert("The text has been changed.");
});
})

you can also try this :
$(document).ready(function(){
$("input").change(function(){
alert("The text has been changed.");
});
});

Put your code inside the:
$(function(){
// Your code
});
The script will wait the DOM ready to start.

Related

add field text to the <p> after .change() with jquery

I am new to jquery. What I want to do is to change the "p" value everytime user changes the input field with syntax like "Input changed to: " and then the value from input field. My code doesn't work. Anyone could explain to me why?
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("#myinput").change(function() {
var str = $("#myinput").val();
$( "p" ).text(str);
});
});
</script>
</head>
<body>
<input type="text" id="myinput">
<p> Text changed to: </p>
</body>
</html>
The change event will run the function when the textbox changes focus (i.e mouse leaves the textbox). To run the function every time the user types a button, try the keyup event.
$(document).ready(function(){
$("#myinput").keyup(function() {
var str = $("#myinput").val();
$( "p" ).text(str);
});
});
Heres a working example: https://jsfiddle.net/8wra05sy/
okay the solution was simple. I should have used the .append() function instead of .text().

JQuery trigger a keydown event first

Before asking this, I did some research on event capturing and bubbling. However, it still does not solve my problem.
I am writing an userscript for this website. Basically, I cannot change the website's code and I can only change my own userscript's code. The website has the window capture the event before my script can get it.
Here is a simplified example:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
//I cannot change this code (it is part of the webpage):
$("p")[0].addEventListener("click",function(){
alert("p");
});
$(window)[0].addEventListener("click",function(){
alert("window");
},true);
//I can change this code (it is part of my userscript):
$("body")[0].addEventListener("click",function(){
alert("body: I want to come first");
});
});
</script>
</head>
<body>
<p>Click Here</p>
</body>
</html>
Edit: Clarification
for this example, I would want the "body" alert to come first, without disabling the "window" or "p" alert. So I would want the result to be either:
"body", "window", "p"
or
"body", "p", "window"
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("body")[0].addEventListener("click",function(){
alert("body: I want to come first");
});
window.RemoveEventListener('click',alert,true);
//I cannot change this code (it is part of the webpage):
$("p")[0].addEventListener("click",function(){
alert("p");
});
$(window)[0].addEventListener("click",function(){
alert("window");
},true);
//I can change this code (it is part of my userscript):
});
</script>
</head>
<body>
<p>Click Here</p>
</body>
</html>
You can using this as i have disabled the event alert and added your script at the starting of the script tag.

Textarea keypress not working

My code won't work. It's supposed to alert whenever a user presses a key while focused inside of a textbox element!
$("#yourcode").keyup(function() {
alert("I found Hogwarts.");
});
You need to wait until the DOM is ready before adding the keyup handler. This can be achieved by calling .ready() after using $() to get a DOM reference to the document (i.e. $(document)). Also make sure you load jQuery before you load the script:
JS:
<script
src="https://code.jquery.com/jquery-3.2.1.min.js"
integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4="
crossorigin="anonymous"></script>
<script>
$(document).ready(function(){
$("#yourcode").keyup(function() {
alert("I found Hogwarts.");
});
});
</script>
HTML:
<textarea id="yourcode"></textarea>
Here is a working example (also available in this jsFiddle):
$(document).ready(function(){
$("#yourcode").keyup(function() {
alert("I found Hogwarts.");
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<textarea id="yourcode"></textarea>

how to click an anchor tag from javascript or jquery

Have an anchor tag, trying to click it from the javascript but not responding, while loading the page it should go to next.php without click anchor tag manually.how can I archive this?
<!DOCTYPE html>
<html>
<head>
<title></title>
<script src="jquery-2.0.3.js"></script>
<script type="text/javascript">
alert("hai");
$(document).ready(function() { $('#about').click(); });
</script>
</head>
<body>
<div>
click here
</div>
</body>
</html>
Use $('selector')[0], as $('selector') returns a jQuery object, so $('selector').click() will fire the click handler, while $('selector')[0].click() would fire the actual click.
$(document).ready(function () {
$('#about')[0].click(); //$('#about').get(0).click();
});
Demo
You can not use javascript to fire click event
It should use
<script type="text/javascript">
$(document).ready(function() {
document.location.href='/next.php'
});
</script>
Here is the code that can help you
$(document).ready(function() {
$(document).ready(function() {
$('a').trigger('click');
});
})
function abc() {
alert("");
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
click me not
If you want the recommended way then use this inside $(document).ready
window.location="where ever you want to go";
If you want the page to go to next.php without clicking then place the window.location directly into $(document).ready(function() { });
Click() function is used when you want to trigger click event. ie. when you want to trigger some action when anchor tag is clicked.
<script>
alert("hai");
$(document).ready(function() {
window.location = 'next.php'; //If you wish the page to automatically go to next page on page load.
$('#about').click( // If you wish to do something clicking anchor
function(){
alert("Hello");
});
});
</script>
$(document).ready(function() { $('#about').trigger('click'); });
Updated:
$(document).ready(function() { $('#about')[0].click(); });

hide div when page load

I have jquery issue, Kindly see my jquery code:
$(document).ready(function(){
$(".toggle_container").show();
$("h2.trigger").toggle(function(){
$(this).addClass("active");
}, function () {
$(this).removeClass("active");
});
$("h2.trigger").click(function(){
$(this).next(".toggle_container").slideToggle("slow,");
});
});
My .toggle_container is shown always its good, But I want to close it first time, when page load. Can you please provide me any solution?
I dont want to use $(".toggle_container").hide(); function for this problem because when i click on href then .toggle_container should not hide, It should open.
Regards.
You can just add attribute
style="display:none"
to your element .toggle_container.
Then on first call of $(document).ready it will be shown.
The full test example:
<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("h2.trigger").click(function(){
$(this).next(".toggle_container").slideToggle("slow,");
});
});
</script>
</head>
<body>
<h2 class="trigger">Toggle</h2>
<div class="toggle_container" style="display:none">Container</div>
</body>
</html>
Note: there`s no $(".toggle_container").show(); on $(document).ready
remove the
$(".toggle_container").show();
from your $(document).ready function.
in html part add style="display:none" for the toggle_container div.
check the #HCK s reply. he is clearly mentioned it..
Once the document gets loaded, a alert box will be prompted "page loaded".
$(document).ready(function(){
alert('page loaded'); // alert to confirm the page is loaded
$('.divClassName').hide(); //enter the class or id of the particular html element which you wish to hide.
});

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