I have the following HTML page:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>demo</title>
<link rel="stylesheet" href="style.css" />
<script src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<script src="script.js"></script>
</head>
<body>
<div class="field">
<label for="value1">Introduce value</label>
<input type="text" id="value1" name="value1" value="" />
</div>
<div class="button-block">
<input type="submit" value="Click" />
</div>
<div id="output">
<h2>Result:</h2>
<textarea name="result" id="result"></textarea>
</div>
</body>
</html>
I want to get the value that is introduced in value1 and when the submit is clicked to put that value in the output. So I wrote in script.js the following code but somehow it doesn't work.
<script>
window.onload = function(){
var val = document.getElementById('value1').innerHTML;
document.getElementById('result').innerHTML = val;
};
</script>
Any ideas?
You have to use .value property of the input field instead of innerHTML. so it would be:
var val = document.getElementById('value1').value;
and also, since you're executing it when the page loads. There will be no value assigned to the input field with id 'value1'. Therefore, you won't get any result.
You can try adding a button with onClick event to execute this function in place of using window.onload
HTML controls you are working on are textboxes, so they have a value property, not innerHTML.
Use this:
var val = document.getElementById('value1').value;
document.getElementById('result').value= val;
You can't get the value of an input element using the innerHTML attribute. Use value instead:
var val = documento.getElementById('value1').value;
Also you should keep in mind that your function is executed when the page loads, NOT when the form is submitted.
The code is not working, because you are calling this function when the window loads, not when the submit button is clicked. Since there is no form, and thus no page loading going on, I'd recommend switching the <input type="submit" value="Click" /> to a button. They are functionally similar, and visually identical. With the the button, though you could use the onclick attribute to call a function when the button is clicked. See below for an example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>demo</title>
<link rel="stylesheet" href="style.css" />
<script src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<script src="script.js"></script>
</head>
<body>
<div class="field">
<label for="value1">Introduce value</label>
<input type="text" id="value1" name="value1" value="" />
</div>
<div class="button-block">
<button onclick="printOutput()">Click</button>
</div>
<div id="output">
<h2>Result:</h2>
<textarea name="result" id="result"></textarea>
</div>
</body>
</html>
Then in your script.js you would have,
function printOutput(){
var val = document.getElementById('value1').value;
document.getElementById('result').innerHTML = val;
}
when the submit is clicked to put that value in the output
You have chosen wrong event window.onload, also you need .value instead of .innerHTML
Option 1: using jQuery, as you already have the import
$(function() {
$('input[type="submit"]').on('click', function(e) {
$('#result').val($('#value1').val());
});
});
<script src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<div class="field">
<label for="value1">Introduce value</label>
<input type="text" id="value1" name="value1" value="" />
</div>
<div class="button-block">
<input type="submit" value="Click" />
</div>
<div id="output">
<h2>Result:</h2>
<textarea name="result" id="result"></textarea>
</div>
Option 2: using plain js
document.addEventListener('DOMContentLoaded', function(e) {
document.querySelector('input[type="submit"]').addEventListener('click', function(e) {
document.querySelector('#result').value = document.querySelector('#value1').value;
});
});
<script src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<div class="field">
<label for="value1">Introduce value</label>
<input type="text" id="value1" name="value1" value="" />
</div>
<div class="button-block">
<input type="submit" value="Click" />
</div>
<div id="output">
<h2>Result:</h2>
<textarea name="result" id="result"></textarea>
</div>
<script>
$( document ).ready(function() {
setTimeout(function(){
var val = document.getElementById('value1').innerHTML;
var generateHere = document.getElementById("result");
generateHere.innerHTML = val;
}, 2000);
});
</script>
Related
i create a very simple website with javascript and html and all i want to do is log input value to the console and my console is printing something and immediately delete it
html:
const alertFunction = () => {
console.log(document.getElementsByClassName("input"))
}
<!DOCTYPE html>
<html>
<head>
<link href="./styles.css" rel="stylesheet" type="text/css">
<script src="./script.js"></script>
<title>Button With Alert</title>
</head>
<body>
<form>
<input placeholder="Please type your name" class="input" type="text">
<br />
<button class="button" onclick="alertFunction()">Alert Your Name</button>
</form>
</body>
</html>
You have few issues in you code:
Since the default type of button is submit, on clicking it from submission is happening. Thus everything disappears. To prevent the form submission you can either use event.preventDefault() inside the event handler function or specify the type="button" in the element.
Document.getElementsByClassName() returns an array-like object of all child elements which have all of the given class names. You have to use proper index to get the specific element. Finally get the value from the input using value property.
const alertFunction = () => {
console.log(document.getElementsByClassName("input")[0].value)
}
<!DOCTYPE html>
<html>
<head>
<link href="./styles.css" rel="stylesheet" type="text/css">
<script src="./script.js"></script>
<title>Button With Alert</title>
</head>
<body>
<form>
<input placeholder="Please type your name" class="input" type="text">
<br />
<button type="button" class="button" onclick="alertFunction()">Alert Your Name</button>
</form>
</body>
</html>
getElementsByClassName returns an NodeList object. Access the element and get value using .value.
Also use input type=button instead of button. Because button click will perform submit event which is not required
Refer- https://www.w3schools.com/jsref/met_document_getelementsbyclassname.asp
const alertFunction = function() {
console.log(document.getElementsByClassName("input")[0].value)
}
<!DOCTYPE html>
<html>
<body>
<form>
<input placeholder="Please type your name" class="input" type="text">
<br />
<input type="button" class="button" onclick="alertFunction()" value="Alert Your Name">
</form>
</body>
</html>
You need to prevent the default event of form submit
const alertFunction = (event) => {
console.log(document.getElementsByClassName("input")[0].value);
event.preventDefault();
}
<!DOCTYPE html>
<html>
<head>
<link href="./styles.css" rel="stylesheet" type="text/css">
<script src="./script.js"></script>
<title>Button With Alert</title>
</head>
<body>
<form>
<input placeholder="Please type your name" class="input" type="text">
<br />
<button class="button" onclick="alertFunction(event)">Alert Your Name</button>
</form>
</body>
</html>
<html>
<head>
<title>JavaScript - using function</title>
<script>
function add(){
var value1=document.getElementById("n1").value;
var value2=document.getElementById("n2").value;
document.getElementById("result").value=parseFloat(value1)+parseFloat(value2);
}
</script>
</head>
<body>
<label>First Number:<input type="number" id="n1"/></label>
<label>Second Number:<input type="number" id="n2"/></label>
<input type="button" value="Add" onClick="add()" />
<p>
Result = <span id="result" ></span>
</p>
</body>
</html>
I am new to JavaScript and wanted to create a script that add numbers up. After pressing "Add" button, I cannot get the result to be displayed. How to get the result displayed?
Two things wrong here...
1)
<input type="button" value="Add" /> change it to
<input type="button" value="Add" onclick="add()" />
Also,
2)
document.getElementById("result").value=parseFloat(value1)+parseFloat(value2);
to
document.getElementById("result").innerHTML=parseFloat(value1)+parseFloat(value2);
PS : This is not a assignment solving website :P
First, You Should Change
document.getElementById("result").value = value1 + value2
To This:
document.getElementById("result").innerHTML = n1 + n2
Because value stands for the attribute value for < input >, not the text written
in the tag.
Second, Change The Button Code To:
<input type="button"value="Add"onclick="add()">
This "onclick" is something called event in javascript,
It means at clicking on the button "Add" it performs the funtion called "add()".
If You Are New To Javascript You Will Know Everything.
Just Be Patient.
It worked with the following changes
-> calling add function with onclick event
-> using innerhtml in place of value
<html>
<head>
<title>JavaScript - using function</title>
<script>
function add(){
var value1=document.getElementById("n1").value;
var value2=document.getElementById("n2").value;
console.log(value1,value2)
document.getElementById("result").innerHTML=parseFloat(value1)+parseFloat(value2);
}
</script>
</head>
<body>
<label>First Number:<input type="number" id="n1"/></label>
<label>Second Number:<input type="number" id="n2"/></label>
<input type="button" value="Add" onclick="add()"/>
<p>
Result = <span id="result" ></span>
</p>
</body>
</html>
Hope this helps
Its better to put the js at the end of the document - also as noted the onclick handler needs to call the function. I also tidied up the code a little.
<html>
<head>
<title>JavaScript - using function</title>
<style>label{display:block}</style>
</head>
<body>
<label>First Number:<input type="number" id="n1"/></label>
<label>Second Number:<input type="number" id="n2"/></label>
<input type="button" value="Add" onclick="add()">
<p>Result = <span id="result" ></span></p>
<script>
function add(){
var value1=parseFloat(document.getElementById("n1").value);
var value2=parseFloat(document.getElementById("n2").value);
var total= value1 + value2;
document.getElementById("result").innerText=total;
}
</script>
</body>
</html>
Below is my part in my html page which is to get a threshold value and to call a function with the value
<form id="distance_input" onSubmit="return false;" >
<p>Enter a threshold</p>
<div class="col-md-8" style="display: inline-block; left:-30px">
<div class="col-md-4">
<div class="input-group">
<input type="text" class="form-control" id="usr" class="search" onkeydown="search(this)"> </input>
<span class="input-group-addon" style="width: 50px">km</span>
</div>
</div>
<div class="col-md-4" style="padding-left:0px; margin-left:-10px">
<input type="button" class="btn btn-success" value="Submit" id="myButton"> </input>
</div>
</div>
<p> </p>
</form>
<script type="text/javascript">
$('#myButton').click(function(){
var value = $("input[type=text]").val();
console.log(value+ " from the submit button");
set_to_threshold(value);
});
function search(ele) {
if(event.keyCode == 13) {
console.log(ele.value+" from enter button");
set_tothreshold(ele.value);
}
}
</script>
But when I do this I get the graphs do not get refreshed( set_tothreshold function gets new data for graph when the value is passes in the function) and shows that
Uncaught ReferenceError: search is not defined
at HTMLInputElement.onkeydown
when I tried with
<script type="text/javascript">
$('#myButton').click(function(){
var value = $("input[type=text]").val();
console.log(value+ " from the submit button");
set_to_threshold(value);
});
</script>
also when I press submit button no changes happened(even does not prints value in console).But why does the value does not get printed.Any help is appreciated.
$('#myButton').click(function(){
var value = $("input[type=text]").val();
console.log(value);
set_to_threshold(value);
});
function set_to_threshold(val){
console.log('do something here with val ', val);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<input type="text" value="input something"/>
<button id="myButton">click</button>
</body>
</html>
this is what you want . yourfunction call when form submit
<form id="distance_input" onSubmit="yourFunction(); return false;" >
Kindly include jquery in your file. It works fine.
<script
src="https://code.jquery.com/jquery-2.2.4.min.js"
integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44="
crossorigin="anonymous"></script>
Include this at the head section of the html page. And also there u referred function set_to_threshold() which is undefined. So only you are getting the error. Kindly write a function for it. it'll work!
basically i have a form which inside that form i have a textbox and a submit button, now what i want is to output text box value into console when a user type something, i found this link https://codepen.io/jnnkm/pen/WxWqwX?editors=1111 which works just perfect but when i copied the html and script code and putted it my editor and ran it trough my browser, it doesn't works at all,
here is how i tried it out:
<!DOCTYPE HTML>
<html>
<head>
<script src="JquerySock.js"></script>
<script>
function postUsernameToServer() {
console.log('executed function')
var username = $("#Registeration_Username_box").val();
console.log(username);
}
$('#Registeration_Username_box').on('input', function() {
console.log('excuted input');
postUsernameToServer();
});
</script>
</head>
<body>
<div id="Registeration_Div" class="Registeration_Div">
<form class="Registration_Form" id="Registration_Form" action="../postr" method="POST">
<div id="Registeration_Username_DIV" class="Registeration_Username_DIV">
<input type="text" id="Registeration_Username_box" class="Registeration_Username_box" placeholder="" name="UserName" maxlength="30" />
</div>
<div class="Registration_Submit_Div">
<input type="submit" value="Submit" id="SumbitForm_btn" class="SumbitForm_btn" name="Submit_btn" />
</div>
</form>
</div>
</body>
</html>
you can try it yourself too, but it didn't worked for me.
okay i found what the problem was, first i had to specify
$(document).ready(function() {
and then input my ajax code, i mean fully it was suppose to be this way
<!DOCTYPE HTML>
<html>
<head>
<script src="JquerySock.js"></script>
<script>
function postUsernameToServer() {
console.log('executed function')
var username = $("#Registeration_Username_box").val();
console.log(username);
}
$(document).ready(function() {
$('#Registeration_Username_box').on('input', function() {
console.log('excuted input');
postUsernameToServer();
});
});
</script>
</head>
<body>
<div id="Registeration_Div" class="Registeration_Div">
<form class="Registration_Form" id="Registration_Form" action="../postr" method="POST">
<div id="Registeration_Username_DIV" class="Registeration_Username_DIV">
<input type="text" id="Registeration_Username_box" class="Registeration_Username_box" placeholder="" name="UserName" maxlength="30" />
</div>
<div class="Registration_Submit_Div">
<input type="submit" value="Submit" id="SumbitForm_btn" class="SumbitForm_btn" name="Submit_btn" />
</div>
</form>
</div>
</body>
</html>
now it works perfect!
I am very new to jquery. Here what I'm trying to do is creating text box and button(login form). The following code is giveing me duplicate result. Is there something wrong with my code?
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="http://code.jquery.com/mobile/1.3.2/jquery.mobile-1.3.2.min.css">
<script src="http://code.jquery.com/jquery-1.8.3.min.js"></script>
<script src="http://code.jquery.com/mobile/1.3.2/jquery.mobile-1.3.2.min.js"></script>
</head>
<body>
<script type="text/javascript">
$(document).ready( function () {
$(".start").append('<div data-role="fieldcontain"><label for="username">User Name:</label><input type="text" name="username" id="username"></br><label for="password">Password:</label><input type="password" name="password" id="password"></div><div data-role="content"><input type="submit" value="Sign In"/></div>');
return false;
});
</script>
<br>
<br>
<div class="start">
<label class="control-label" for="inputEmail">Sign In to xRM 360</label>
</div>
<br>
<br>
</body>
</html>
What is happening is the $(document).ready is being called twice. I think this may have to do with jQuery mobile.
See here:
jQuery $(document).ready () fires twice
And here:
http://forum.jquery.com/topic/jquery-jquerymobile-document-ready-called-twice
for more information.
A quick fix is to put the script tag in the head tag. See example below.
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="http://code.jquery.com/mobile/1.3.2/jquery.mobile-1.3.2.min.css">
<script src="http://code.jquery.com/jquery-1.8.3.min.js"></script>
<script src="http://code.jquery.com/mobile/1.3.2/jquery.mobile-1.3.2.min.js"></script>
<script type="text/javascript">
$(document).ready( function () {
$(".start").append('<div data-role="fieldcontain"><label for="username">User Name:</label><input type="text" name="username" id="username"></br><label for="password">Password:</label><input type="password" name="password" id="password"></div><div data-role="content"><input type="submit" value="Sign In"/></div>');
return false;
});
</script>
</head>
<body>
<br>
<br>
<div class="start">
<label class="control-label" for="inputEmail">Sign In to xRM 360</label>
</div>
<br>
<br>
</body>
</html>