How to debug Javascript code written inside an asp page - javascript

I have a form with a button written in a .asp page and when it's clicked, it calls for a js function. I need to figure a way to debug this using developer tools.
<html>
<head>
<title>Test</title>
<script type="text/javascript">
$(document).ready(function() {
$("#butReport").bind("click", butReport_onClick);
});
function butReport_onClick() {
var cReportOptions = null;
//some code
};
</script>
</head>
<body>
some code.
</body>
</html>

I don't think this has anything to do with classic ASP.
You are missing the jQuery definition in this code, see here https://www.w3schools.com/jquery/jquery_get_started.asp
I added this
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js"></script>
<title>Test</title>
<script type="text/javascript">
$(document).ready(function() {
$("#butReport").bind("click", butReport_onClick);
});
function butReport_onClick() {
var cReportOptions = null;
//some code
console.log("Hello");
};
</script>
</head>
<body>
<div id="butReport">some code.</div>
</body>
</html>
When I click it I get this:
I hope this helps

button written in asp with id="butReport". Using javascript:
<button id="butReport"></button>
<script type="text/javascript">
var elem=document.getElementById('butReport').onclick = function(){
// some code
// test not using console.log();
document.getElementById('hasilnya').innerHTML = 'test';
}
</script>
<div id="hasilnya" style="margin-top:1em;"></div>

Related

Asp.net mvc, onload functions from Layout AND Webpage not working

I'm working on an asp.net mvc project and i have a problem with some javascripts functions.
I would like to execute functionA (from layout) & functionB (from a webpage) when the page is loading.
_Layout.cshtml:
<!DOCTYPE html>
<html lang="en">
<head>
...
</head>
<body>
</body>
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<script>
function functionA() {
alert("Hello from Layout");
}
window.onload = functionA;
</script>
</html>
Webpage.cshtml:
#{
ViewData["Title"] = "***";
}
<div>
...
</div>
#section Scripts
{
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<script>
function functionB() {
alert("Hello from WebPage");
}
window.onload = functionB;
</script>
}
window.onload is only working for the layout so when i'm going the the Webpage i can see "Hello from Layout" and not "Hello from Webpage".
Do you have an idea to perform both functions?
Thanks :) .
I managed to make it work like this:
window.onload = function () {
myFunction();
}

Calling function from another javascript inside jquery

I have a Javascript file named loader.js which contains a function called initialize(). I want to call this function via jQuery. This is my HTML file:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="loader.js" ></script>
<script type="text/javascript">
jQuery(document).ready(function() {
jQuery(document).on("click", ".link", function(e) {
e.preventDefault();
var a= $(this).text();
window.initialize= function{
};
initialize(a);
});
});
</script>
</head>
<body >
<h1>welcome to my website </h1>
link1
link2
<div id="main">
</div>
</body>
</html>
This is loader.js:
function initialize(a) {
$('#main').html= a;
}
I do not know what is wrong with this script, I have debug it jquery is working fine but funtion is not working correctly.
also I want that whenever the function is clicked again the div should be refreshed for example first it contain link1 but when link2 is clicked link1 should be removed inside the div how can i accomplish this task????
thanks in advance
You're not including the loader script. Add <script src='loader.js'></script> before the jQuery code.
The code in loader.js should be inside a jQuery(document).ready callback since it's now using jquery (the html method).
Also as #jiihoo pointed out you should use $('#main').html(a); instead of $('#main').html = a;.
You should change to code of loader.js to this.
function initialize(a) {
$('#main').html(a);
}
Heres the whole thing you could do.
Html
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"> </script>
<script src="loader.js"></script>
</head>
<body >
<h1>welcome to my website </h1>
link1
link2
<div id="main"></div>
</body>
</html>
Loader.js
jQuery(document).ready(function() {
jQuery(document).on("click", ".link", function(e) {
e.preventDefault();
var a = $(this).text();
initialize(a);
});
});
function initialize(a) {
$('#main').html(a);
}

JQuery trigger click event not working

I'm having trouble getting the following to work:
$('#elem').trigger('click');
When I run it, it doesn't trigger a click but it doesn't show any error logs in the console either.
I've also tried the following with no luck:
$('#elem')[0].click();
Any ideas as to what could be going wrong or a solution for this?
Update: Jquery is working and when I inspect the element, #elem does appear (it's an id for a button)
HTML:
<a:button id="elem">My Button</Button>
JQuery:
P.when('A', 'jQuery').execute(function (A, $) {
//when this function is called, it should trigger a button click
triggerButtonClick = function() {
$('#elem').trigger('click');
};
});
Try it in document.ready function, then all dom loads when the document is ready.You can do something like this based on your requirement.
$( document ).ready(function() {
$('#radio').click(function(){
$('#elem')[0].click();
})
});
i have tried this code and it works
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"> </script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("chk1").click(function(){
$('#usr').trigger('click');
});
});
</script>
</head>
<body>
<form action="sample.php">
<button id="chk1">click</button>
<input class="form-control" type="submit" id="usr">
</form>
</body>
</html>
this code works for me:
$(window).load(function() {
$('#menu_toggle').trigger('click');
});
$(document).ready(function () {
$('#elem').click(function () {
alert('clicked');
$(this).css('color', 'red');
});
$('#elem').trigger('click');
});
<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<body>
<div id="elem" >test</div>
</body>
</html>

Can't call function when clicking

<html>
<head>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<script>
$(function blub()
{
var x = $("#content").attr("data-x");
$("#content").append(x);
});
</script>
</head>
<body>
<div id="content">
Link<br/>
</div>
</body>
</html>
leads to "ReferenceError: Can't find variable: blub"
What most likely obvious thing am I missing?
Try this :
function blub()
{
var x = $("#content").attr("data-x");
$("#content").append(x);
}
Instead of using :
$(function blub()
{
var x = $("#content").attr("data-x");
$("#content").append(x);
});
In your code you are calling a function(callback) without declaring it. this is not correct way to declaration a function.
JavaScript Functions
According your code you don't need to do any thing on document ready because your function trigger when anyone click on anchor Link. And the second thing is your code is not correct see this one $("#content").attr("data-x") Here you trying to get the data-x attribute of content div, but your div does not contains that attribute use this $("a").attr("data-x"):
Try the following code:
<html>
<head>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<script>
function blub() //-- It's declarition of an function
{
var x = $("a").attr("data-x");
$("#content").append(x);
}
</script>
</head>
<body>
<div id="content">
Link<br/>
</div>
</body>
</html>
Working Example
try this:
<html>
<head>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<script>
function blub()
{
var x = $("#content").attr("data-x");
$("#content").append(x);
}
</script>
</head>
<body>
<div id="content">
Link<br/>
</div>
</body>
</html>
The reason you're getting the error is because it can't find the value .attr("data-x"); on the tag <div id="content">. It simply doesn't exist there. If you're looking to append the data-x="12" as a value inside the <div> tag, you could do something like this:
<html>
<body>
<div id="content">
Link
<br/>
</div>
</body>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<script>
$(function () {
$('a[data-role="appender"]').click(function (e) {
e.preventDefault();
var x = $(this).data('x');
$('#content').append(x);
});
});
</script>
</html>
The code above attaches the code to the .click function in jQuery and is wired up using the $('a[data-role="appender"]') which makes your mark up a little bit cleaner. Hope this helps out ! The working solution can be found here: http://jsfiddle.net/TrV8z/
The function blub is local to your script because your passed it as an argument to the jQuery object by wrapping your code with $(...);. Your function is executed when the DOM finishes loading, but in a local scope, which you cannot access from an event attribute. The best way to solve your problem would be not to use an event attribute. Moreover, the div #element doesn't have a "data-x" attribute. Its child a element has one. Try this:
$(function() {
$("#targetlink").click(function(e) {
e.preventDefault();
var x = $("#targetlink").attr("data-x");
$("#targetlink").append(x);
})
});

How can I access JavaScript defined in <head> from <body>

For example suppose I have
function myTest() {
return "test";
}
defined in <head>
In body if I try to call myTest() it fails. How can I make functions and variables accessible from body?
Script in the head tag will get parsed first, so your variables and functions are accessible from script in the body tag. Your problem must be elsewhere, because the following example works:
<!doctype html>
<html>
<head>
<script type="text/javascript">
function myTest() {
return "test";
}
</script>
</head>
<body>
<script type="text/javascript">
alert(myTest());
</script>
</body>
</html>
You need to place all JavaScript into <script>...</script> tags, OR, place it in event handling attributes (like onclick).
<html>
<head>
<script type="text/javascript">
function myTest() {
alert("hi");
}
</script>
</head>
<body>
<input type="button" onclick="myTest();" />
</body>
</html>
This is Your function in Head..
function myFunction(a)
{
return (a)
}
Then call like below
<script type="text/javascript">
myFunction(12);
</script>

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