Get textbox value in single/multiple - javascript

I have a field in my page named as "myField" Now this is dynamic So there are 2 cases i.e. it can be just 1 field as;
<input type="text" name="myField" />
OR there can be 2 fields as below;
<input type="text" name="myField" />
<input type="hidden" name="myField" />
I use the following code to access the value in JS;
document.forms[0].myField[0].value
However, this does not work if there is only 1 field (as in the first case)
How do I write dynamic JS code to handle the same? It should be cross browser compatible.


document.getElementById("btn").addEventListener("click", function() {
var texts = document.getElementsByName("n");
var sum = "";
for( var i = 0; i < texts.length; i ++ ) {
sum = sum + texts[i].value;
}
document.getElementById("sum").innerHTML = sum;
});
<input type="text" name="n"/>
<input type="text" name="n"/>
<p id="sum"></p>
<button id="btn"> Get Sum</button>
or Visit :How get total sum from input box values using Javascript?


On first glance of that particular example, it seems odd that those two fields have the same name. Normally one would expect the same name for fields that are mutually-exclusive, or that are the same type and form a list.
But you can still work with them: I wouldn't use the automatic properties, since as you've discovered they're inconsistent (document.forms[0].myField will be the field when there's only one, but a collection of fields with the same name if there's more than one). I'd use querySelectorAll:
var fields = document.querySelectorAll('[name="myField"]');
fields will reliably be a list. You can access the elements of that list using fields[0] and such, and get the length from fields.length.
var fields = document.querySelectorAll('[name="myField"]');
for (var n = 0; n < fields.length; ++n) {
console.log("fields[" + n + "].value: ", fields[n].value);
}
<input type="text" name="myField" value="the text field"/>
<input type="hidden" name="myField" value="the hidden field"/>

Related

Uncaught TypeError: document.getElementById(...).value.totoUpperCase is not a function [duplicate]

I am working on a search with JavaScript. I would use a form, but it messes up something else on my page. I have this input text field:
<input name="searchTxt" type="text" maxlength="512" id="searchTxt" class="searchField"/>
And this is my JavaScript code:
<script type="text/javascript">
function searchURL(){
window.location = "http://www.myurl.com/search/" + (input text value);
}
</script>
How do I get the value from the text field into JavaScript?

There are various methods to get an input textbox value directly (without wrapping the input element inside a form element):
Method 1
document.getElementById('textbox_id').value to get the value of
desired box
For example
document.getElementById("searchTxt").value;
 
Note: Method 2,3,4 and 6 returns a collection of elements, so use [whole_number] to get the desired occurrence. For the first element, use [0],
for the second one use [1], and so on...
Method 2
Use
document.getElementsByClassName('class_name')[whole_number].value which returns a Live HTMLCollection
For example
document.getElementsByClassName("searchField")[0].value; if this is the first textbox in your page.
Method 3
Use document.getElementsByTagName('tag_name')[whole_number].value which also returns a live HTMLCollection
For example
document.getElementsByTagName("input")[0].value;, if this is the first textbox in your page.
Method 4
document.getElementsByName('name')[whole_number].value which also >returns a live NodeList
For example
document.getElementsByName("searchTxt")[0].value; if this is the first textbox with name 'searchtext' in your page.
Method 5
Use the powerful document.querySelector('selector').value which uses a CSS selector to select the element
For example
document.querySelector('#searchTxt').value; selected by id
document.querySelector('.searchField').value; selected by class
document.querySelector('input').value; selected by tagname
document.querySelector('[name="searchTxt"]').value; selected by name
Method 6
document.querySelectorAll('selector')[whole_number].value which also uses a CSS selector to select elements, but it returns all elements with that selector as a static Nodelist.
For example
document.querySelectorAll('#searchTxt')[0].value; selected by id
document.querySelectorAll('.searchField')[0].value; selected by class
document.querySelectorAll('input')[0].value; selected by tagname
document.querySelectorAll('[name="searchTxt"]')[0].value; selected by name
Support
Browser
Method1
Method2
Method3
Method4
Method5/6
IE6
Y(Buggy)
N
Y
Y(Buggy)
N
IE7
Y(Buggy)
N
Y
Y(Buggy)
N
IE8
Y
N
Y
Y(Buggy)
Y
IE9
Y
Y
Y
Y(Buggy)
Y
IE10
Y
Y
Y
Y
Y
FF3.0
Y
Y
Y
Y
N IE=Internet Explorer
FF3.5/FF3.6
Y
Y
Y
Y
Y FF=Mozilla Firefox
FF4b1
Y
Y
Y
Y
Y GC=Google Chrome
GC4/GC5
Y
Y
Y
Y
Y Y=YES,N=NO
Safari4/Safari5
Y
Y
Y
Y
Y
Opera10.10/
Opera10.53/
Y
Y
Y
Y(Buggy)
Y
Opera10.60
Opera 12
Y
Y
Y
Y
Y
Useful links
To see the support of these methods with all the bugs including more details click here
Difference Between Static collections and Live collections click Here
Difference Between NodeList and HTMLCollection click Here

//creates a listener for when you press a key
window.onkeyup = keyup;
//creates a global Javascript variable
var inputTextValue;
function keyup(e) {
//setting your input text to the global Javascript Variable for every key press
inputTextValue = e.target.value;
//listens for you to press the ENTER key, at which point your web address will change to the one you have input in the search box
if (e.keyCode == 13) {
window.location = "http://www.myurl.com/search/" + inputTextValue;
}
}
See this functioning in codepen.

I would create a variable to store the input like this:
var input = document.getElementById("input_id").value;
And then I would just use the variable to add the input value to the string.
= "Your string" + input;

You should be able to type:
var input = document.getElementById("searchTxt");
function searchURL() {
window.location = "http://www.myurl.com/search/" + input.value;
}
<input name="searchTxt" type="text" maxlength="512" id="searchTxt" class="searchField"/>
I'm sure there are better ways to do this, but this one seems to work across all browsers, and it requires minimal understanding of JavaScript to make, improve, and edit.

Also you can, call by tags names, like this: form_name.input_name.value;
So you will have the specific value of determined input in a specific form.

Short
You can read value by searchTxt.value
<input name="searchTxt" type="text" maxlength="512" id="searchTxt" class="searchField"/>
<script type="text/javascript">
function searchURL(){
console.log(searchTxt.value);
// window.location = "http://www.myurl.com/search/" + searchTxt.value;
}
</script>
<!-- SHORT ugly test code -->
<button class="search" onclick="searchURL()">Search</button>

<input type="text" onkeyup="trackChange(this.value)" id="myInput">
<script>
function trackChange(value) {
window.open("http://www.google.com/search?output=search&q=" + value)
}
</script>

Tested in Chrome and Firefox:
Get value by element id:
<input type="text" maxlength="512" id="searchTxt" class="searchField"/>
<input type="button" value="Get Value" onclick="alert(searchTxt.value)">
Set value in form element:
<form name="calc" id="calculator">
<input type="text" name="input">
<input type="button" value="Set Value" onclick="calc.input.value='Set Value'">
</form>
https://jsfiddle.net/tuq79821/
Also have a look at a JavaScript calculator implementation.
From #bugwheels94: when using this method, be aware of this issue.

If your input is in a form and you want to get the value after submit you can do like:
<form onsubmit="submitLoginForm(event)">
<input type="text" name="name">
<input type="password" name="password">
<input type="submit" value="Login">
</form>
<script type="text/javascript">
function submitLoginForm(event){
event.preventDefault();
console.log(event.target['name'].value);
console.log(event.target['password'].value);
}
</script>
Benefit of this way: Example your page have 2 form for input sender and receiver information.
If you don't use form for get value then
You can set two different id (or tag or name ...) for each field like sender-name and receiver-name, sender-address and receiver-address, ...
If you set the same value for two inputs, then after getElementsByName (or getElementsByTagName ...) you need to remember 0 or 1 is sender or receiver. Later, if you change the order of 2 form in HTML, you need to check this code again
If you use form, then you can use name, address, ...

You can use onkeyup when you have more than one input field. Suppose you have four or input. Then
document.getElementById('something').value is annoying. We need to write four lines to fetch the value of an input field.
So, you can create a function that store value in object on keyup or keydown event.
Example:
<div class="container">
<div>
<label for="">Name</label>
<input type="text" name="fname" id="fname" onkeyup=handleInput(this)>
</div>
<div>
<label for="">Age</label>
<input type="number" name="age" id="age" onkeyup=handleInput(this)>
</div>
<div>
<label for="">Email</label>
<input type="text" name="email" id="email" onkeyup=handleInput(this)>
</div>
<div>
<label for="">Mobile</label>
<input type="number" name="mobile" id="number" onkeyup=handleInput(this)>
</div>
<div>
<button onclick=submitData()>Submit</button>
</div>
</div>
JavaScript:
<script>
const data = { };
function handleInput(e){
data[e.name] = e.value;
}
function submitData(){
console.log(data.fname); // Get the first name from the object
console.log(data); // return object
}
</script>

function handleValueChange() {
var y = document.getElementById('textbox_id').value;
var x = document.getElementById('result');
x.innerHTML = y;
}
function changeTextarea() {
var a = document.getElementById('text-area').value;
var b = document.getElementById('text-area-result');
b.innerHTML = a;
}
input {
padding: 5px;
}
p {
white-space: pre;
}
<input type="text" id="textbox_id" placeholder="Enter string here..." oninput="handleValueChange()">
<p id="result"></p>
<textarea name="" id="text-area" cols="20" rows="5" oninput="changeTextarea()"></textarea>
<p id="text-area-result"></p>

<input id="new" >
<button onselect="myFunction()">it</button>
<script>
function myFunction() {
document.getElementById("new").value = "a";
}
</script>

One can use the form.elements to get all elements in a form. If an element has id it can be found with .namedItem("id"). Example:
var myForm = document.getElementById("form1");
var text = myForm.elements.namedItem("searchTxt").value;
var url = "http://www.myurl.com/search/" + text;
Source: w3schools

function searchURL() {
window.location = 'http://www.myurl.com/search/' + searchTxt.value
}
So basically searchTxt.value will return the value of the input field with id='searchTxt'.

Short Answer
You can get the value of text input field using JavaScript with this code: input_text_value = console.log(document.getElementById("searchTxt").value)
More info
textObject has a property of value you can set and get this property.
To set you can assign a new value:
document.getElementById("searchTxt").value = "new value"

Simple JavaScript:
function copytext(text) {
var textField = document.createElement('textarea');
textField.innerText = text;
document.body.appendChild(textField);
textField.select();
document.execCommand('copy');
textField.remove();
}

Why is if block executing and not the else block in javascript? [duplicate]

I am working on a search with JavaScript. I would use a form, but it messes up something else on my page. I have this input text field:
<input name="searchTxt" type="text" maxlength="512" id="searchTxt" class="searchField"/>
And this is my JavaScript code:
<script type="text/javascript">
function searchURL(){
window.location = "http://www.myurl.com/search/" + (input text value);
}
</script>
How do I get the value from the text field into JavaScript?

There are various methods to get an input textbox value directly (without wrapping the input element inside a form element):
Method 1
document.getElementById('textbox_id').value to get the value of
desired box
For example
document.getElementById("searchTxt").value;
 
Note: Method 2,3,4 and 6 returns a collection of elements, so use [whole_number] to get the desired occurrence. For the first element, use [0],
for the second one use [1], and so on...
Method 2
Use
document.getElementsByClassName('class_name')[whole_number].value which returns a Live HTMLCollection
For example
document.getElementsByClassName("searchField")[0].value; if this is the first textbox in your page.
Method 3
Use document.getElementsByTagName('tag_name')[whole_number].value which also returns a live HTMLCollection
For example
document.getElementsByTagName("input")[0].value;, if this is the first textbox in your page.
Method 4
document.getElementsByName('name')[whole_number].value which also >returns a live NodeList
For example
document.getElementsByName("searchTxt")[0].value; if this is the first textbox with name 'searchtext' in your page.
Method 5
Use the powerful document.querySelector('selector').value which uses a CSS selector to select the element
For example
document.querySelector('#searchTxt').value; selected by id
document.querySelector('.searchField').value; selected by class
document.querySelector('input').value; selected by tagname
document.querySelector('[name="searchTxt"]').value; selected by name
Method 6
document.querySelectorAll('selector')[whole_number].value which also uses a CSS selector to select elements, but it returns all elements with that selector as a static Nodelist.
For example
document.querySelectorAll('#searchTxt')[0].value; selected by id
document.querySelectorAll('.searchField')[0].value; selected by class
document.querySelectorAll('input')[0].value; selected by tagname
document.querySelectorAll('[name="searchTxt"]')[0].value; selected by name
Support
Browser
Method1
Method2
Method3
Method4
Method5/6
IE6
Y(Buggy)
N
Y
Y(Buggy)
N
IE7
Y(Buggy)
N
Y
Y(Buggy)
N
IE8
Y
N
Y
Y(Buggy)
Y
IE9
Y
Y
Y
Y(Buggy)
Y
IE10
Y
Y
Y
Y
Y
FF3.0
Y
Y
Y
Y
N IE=Internet Explorer
FF3.5/FF3.6
Y
Y
Y
Y
Y FF=Mozilla Firefox
FF4b1
Y
Y
Y
Y
Y GC=Google Chrome
GC4/GC5
Y
Y
Y
Y
Y Y=YES,N=NO
Safari4/Safari5
Y
Y
Y
Y
Y
Opera10.10/
Opera10.53/
Y
Y
Y
Y(Buggy)
Y
Opera10.60
Opera 12
Y
Y
Y
Y
Y
Useful links
To see the support of these methods with all the bugs including more details click here
Difference Between Static collections and Live collections click Here
Difference Between NodeList and HTMLCollection click Here

//creates a listener for when you press a key
window.onkeyup = keyup;
//creates a global Javascript variable
var inputTextValue;
function keyup(e) {
//setting your input text to the global Javascript Variable for every key press
inputTextValue = e.target.value;
//listens for you to press the ENTER key, at which point your web address will change to the one you have input in the search box
if (e.keyCode == 13) {
window.location = "http://www.myurl.com/search/" + inputTextValue;
}
}
See this functioning in codepen.

I would create a variable to store the input like this:
var input = document.getElementById("input_id").value;
And then I would just use the variable to add the input value to the string.
= "Your string" + input;

You should be able to type:
var input = document.getElementById("searchTxt");
function searchURL() {
window.location = "http://www.myurl.com/search/" + input.value;
}
<input name="searchTxt" type="text" maxlength="512" id="searchTxt" class="searchField"/>
I'm sure there are better ways to do this, but this one seems to work across all browsers, and it requires minimal understanding of JavaScript to make, improve, and edit.

Also you can, call by tags names, like this: form_name.input_name.value;
So you will have the specific value of determined input in a specific form.

Short
You can read value by searchTxt.value
<input name="searchTxt" type="text" maxlength="512" id="searchTxt" class="searchField"/>
<script type="text/javascript">
function searchURL(){
console.log(searchTxt.value);
// window.location = "http://www.myurl.com/search/" + searchTxt.value;
}
</script>
<!-- SHORT ugly test code -->
<button class="search" onclick="searchURL()">Search</button>

<input type="text" onkeyup="trackChange(this.value)" id="myInput">
<script>
function trackChange(value) {
window.open("http://www.google.com/search?output=search&q=" + value)
}
</script>

Tested in Chrome and Firefox:
Get value by element id:
<input type="text" maxlength="512" id="searchTxt" class="searchField"/>
<input type="button" value="Get Value" onclick="alert(searchTxt.value)">
Set value in form element:
<form name="calc" id="calculator">
<input type="text" name="input">
<input type="button" value="Set Value" onclick="calc.input.value='Set Value'">
</form>
https://jsfiddle.net/tuq79821/
Also have a look at a JavaScript calculator implementation.
From #bugwheels94: when using this method, be aware of this issue.

If your input is in a form and you want to get the value after submit you can do like:
<form onsubmit="submitLoginForm(event)">
<input type="text" name="name">
<input type="password" name="password">
<input type="submit" value="Login">
</form>
<script type="text/javascript">
function submitLoginForm(event){
event.preventDefault();
console.log(event.target['name'].value);
console.log(event.target['password'].value);
}
</script>
Benefit of this way: Example your page have 2 form for input sender and receiver information.
If you don't use form for get value then
You can set two different id (or tag or name ...) for each field like sender-name and receiver-name, sender-address and receiver-address, ...
If you set the same value for two inputs, then after getElementsByName (or getElementsByTagName ...) you need to remember 0 or 1 is sender or receiver. Later, if you change the order of 2 form in HTML, you need to check this code again
If you use form, then you can use name, address, ...

You can use onkeyup when you have more than one input field. Suppose you have four or input. Then
document.getElementById('something').value is annoying. We need to write four lines to fetch the value of an input field.
So, you can create a function that store value in object on keyup or keydown event.
Example:
<div class="container">
<div>
<label for="">Name</label>
<input type="text" name="fname" id="fname" onkeyup=handleInput(this)>
</div>
<div>
<label for="">Age</label>
<input type="number" name="age" id="age" onkeyup=handleInput(this)>
</div>
<div>
<label for="">Email</label>
<input type="text" name="email" id="email" onkeyup=handleInput(this)>
</div>
<div>
<label for="">Mobile</label>
<input type="number" name="mobile" id="number" onkeyup=handleInput(this)>
</div>
<div>
<button onclick=submitData()>Submit</button>
</div>
</div>
JavaScript:
<script>
const data = { };
function handleInput(e){
data[e.name] = e.value;
}
function submitData(){
console.log(data.fname); // Get the first name from the object
console.log(data); // return object
}
</script>

function handleValueChange() {
var y = document.getElementById('textbox_id').value;
var x = document.getElementById('result');
x.innerHTML = y;
}
function changeTextarea() {
var a = document.getElementById('text-area').value;
var b = document.getElementById('text-area-result');
b.innerHTML = a;
}
input {
padding: 5px;
}
p {
white-space: pre;
}
<input type="text" id="textbox_id" placeholder="Enter string here..." oninput="handleValueChange()">
<p id="result"></p>
<textarea name="" id="text-area" cols="20" rows="5" oninput="changeTextarea()"></textarea>
<p id="text-area-result"></p>

<input id="new" >
<button onselect="myFunction()">it</button>
<script>
function myFunction() {
document.getElementById("new").value = "a";
}
</script>

One can use the form.elements to get all elements in a form. If an element has id it can be found with .namedItem("id"). Example:
var myForm = document.getElementById("form1");
var text = myForm.elements.namedItem("searchTxt").value;
var url = "http://www.myurl.com/search/" + text;
Source: w3schools

function searchURL() {
window.location = 'http://www.myurl.com/search/' + searchTxt.value
}
So basically searchTxt.value will return the value of the input field with id='searchTxt'.

Short Answer
You can get the value of text input field using JavaScript with this code: input_text_value = console.log(document.getElementById("searchTxt").value)
More info
textObject has a property of value you can set and get this property.
To set you can assign a new value:
document.getElementById("searchTxt").value = "new value"

Simple JavaScript:
function copytext(text) {
var textField = document.createElement('textarea');
textField.innerText = text;
document.body.appendChild(textField);
textField.select();
document.execCommand('copy');
textField.remove();
}

How to get hidden array value from output to PHP

I got an output array code,
<output class="gst" id="op" name="Gst[]">0.00</output>
i got an input hidden array code,
<input type="hidden" id="gst2" name="Gst2[]">
I got a function to show the amount of gst for each output
function myFunction() {
debugger
var ele = document.querySelectorAll('input.input');
let sum = 0;
ele.forEach(input => {
sum += input.value ? parseFloat(input.value) : 0;
$(input).parents("tr").find(".gst").text((input.value * 0.07).toFixed(2));
});
document.getElementById('result').textContent = sum.toFixed(2);
}
my problem is, how do i get the hidden array gst2 value in PHP?

You can't get de hidden field value in PHP without wrapping it in a form and do a POST / GET request. You could do something like this:
<form method="POST">
<input type="hidden" id="gst2" name="Gst2[]">
<input type="submit" value="Submit">
</form>
After you submit the form $_POST['Gst2'] will be set and you can use that variable. You could do the same with method="GET".
EDIT:
You can find multiple solutions in this post:
https://stackoverflow.com/a/50412517/2075596
Just use input tag using same id and name.

Switch jumps to case 2: [duplicate]

I am working on a search with JavaScript. I would use a form, but it messes up something else on my page. I have this input text field:
<input name="searchTxt" type="text" maxlength="512" id="searchTxt" class="searchField"/>
And this is my JavaScript code:
<script type="text/javascript">
function searchURL(){
window.location = "http://www.myurl.com/search/" + (input text value);
}
</script>
How do I get the value from the text field into JavaScript?

There are various methods to get an input textbox value directly (without wrapping the input element inside a form element):
Method 1
document.getElementById('textbox_id').value to get the value of
desired box
For example
document.getElementById("searchTxt").value;
 
Note: Method 2,3,4 and 6 returns a collection of elements, so use [whole_number] to get the desired occurrence. For the first element, use [0],
for the second one use [1], and so on...
Method 2
Use
document.getElementsByClassName('class_name')[whole_number].value which returns a Live HTMLCollection
For example
document.getElementsByClassName("searchField")[0].value; if this is the first textbox in your page.
Method 3
Use document.getElementsByTagName('tag_name')[whole_number].value which also returns a live HTMLCollection
For example
document.getElementsByTagName("input")[0].value;, if this is the first textbox in your page.
Method 4
document.getElementsByName('name')[whole_number].value which also >returns a live NodeList
For example
document.getElementsByName("searchTxt")[0].value; if this is the first textbox with name 'searchtext' in your page.
Method 5
Use the powerful document.querySelector('selector').value which uses a CSS selector to select the element
For example
document.querySelector('#searchTxt').value; selected by id
document.querySelector('.searchField').value; selected by class
document.querySelector('input').value; selected by tagname
document.querySelector('[name="searchTxt"]').value; selected by name
Method 6
document.querySelectorAll('selector')[whole_number].value which also uses a CSS selector to select elements, but it returns all elements with that selector as a static Nodelist.
For example
document.querySelectorAll('#searchTxt')[0].value; selected by id
document.querySelectorAll('.searchField')[0].value; selected by class
document.querySelectorAll('input')[0].value; selected by tagname
document.querySelectorAll('[name="searchTxt"]')[0].value; selected by name
Support
Browser
Method1
Method2
Method3
Method4
Method5/6
IE6
Y(Buggy)
N
Y
Y(Buggy)
N
IE7
Y(Buggy)
N
Y
Y(Buggy)
N
IE8
Y
N
Y
Y(Buggy)
Y
IE9
Y
Y
Y
Y(Buggy)
Y
IE10
Y
Y
Y
Y
Y
FF3.0
Y
Y
Y
Y
N IE=Internet Explorer
FF3.5/FF3.6
Y
Y
Y
Y
Y FF=Mozilla Firefox
FF4b1
Y
Y
Y
Y
Y GC=Google Chrome
GC4/GC5
Y
Y
Y
Y
Y Y=YES,N=NO
Safari4/Safari5
Y
Y
Y
Y
Y
Opera10.10/
Opera10.53/
Y
Y
Y
Y(Buggy)
Y
Opera10.60
Opera 12
Y
Y
Y
Y
Y
Useful links
To see the support of these methods with all the bugs including more details click here
Difference Between Static collections and Live collections click Here
Difference Between NodeList and HTMLCollection click Here

//creates a listener for when you press a key
window.onkeyup = keyup;
//creates a global Javascript variable
var inputTextValue;
function keyup(e) {
//setting your input text to the global Javascript Variable for every key press
inputTextValue = e.target.value;
//listens for you to press the ENTER key, at which point your web address will change to the one you have input in the search box
if (e.keyCode == 13) {
window.location = "http://www.myurl.com/search/" + inputTextValue;
}
}
See this functioning in codepen.

I would create a variable to store the input like this:
var input = document.getElementById("input_id").value;
And then I would just use the variable to add the input value to the string.
= "Your string" + input;

You should be able to type:
var input = document.getElementById("searchTxt");
function searchURL() {
window.location = "http://www.myurl.com/search/" + input.value;
}
<input name="searchTxt" type="text" maxlength="512" id="searchTxt" class="searchField"/>
I'm sure there are better ways to do this, but this one seems to work across all browsers, and it requires minimal understanding of JavaScript to make, improve, and edit.

Also you can, call by tags names, like this: form_name.input_name.value;
So you will have the specific value of determined input in a specific form.

Short
You can read value by searchTxt.value
<input name="searchTxt" type="text" maxlength="512" id="searchTxt" class="searchField"/>
<script type="text/javascript">
function searchURL(){
console.log(searchTxt.value);
// window.location = "http://www.myurl.com/search/" + searchTxt.value;
}
</script>
<!-- SHORT ugly test code -->
<button class="search" onclick="searchURL()">Search</button>

<input type="text" onkeyup="trackChange(this.value)" id="myInput">
<script>
function trackChange(value) {
window.open("http://www.google.com/search?output=search&q=" + value)
}
</script>

Tested in Chrome and Firefox:
Get value by element id:
<input type="text" maxlength="512" id="searchTxt" class="searchField"/>
<input type="button" value="Get Value" onclick="alert(searchTxt.value)">
Set value in form element:
<form name="calc" id="calculator">
<input type="text" name="input">
<input type="button" value="Set Value" onclick="calc.input.value='Set Value'">
</form>
https://jsfiddle.net/tuq79821/
Also have a look at a JavaScript calculator implementation.
From #bugwheels94: when using this method, be aware of this issue.

If your input is in a form and you want to get the value after submit you can do like:
<form onsubmit="submitLoginForm(event)">
<input type="text" name="name">
<input type="password" name="password">
<input type="submit" value="Login">
</form>
<script type="text/javascript">
function submitLoginForm(event){
event.preventDefault();
console.log(event.target['name'].value);
console.log(event.target['password'].value);
}
</script>
Benefit of this way: Example your page have 2 form for input sender and receiver information.
If you don't use form for get value then
You can set two different id (or tag or name ...) for each field like sender-name and receiver-name, sender-address and receiver-address, ...
If you set the same value for two inputs, then after getElementsByName (or getElementsByTagName ...) you need to remember 0 or 1 is sender or receiver. Later, if you change the order of 2 form in HTML, you need to check this code again
If you use form, then you can use name, address, ...

You can use onkeyup when you have more than one input field. Suppose you have four or input. Then
document.getElementById('something').value is annoying. We need to write four lines to fetch the value of an input field.
So, you can create a function that store value in object on keyup or keydown event.
Example:
<div class="container">
<div>
<label for="">Name</label>
<input type="text" name="fname" id="fname" onkeyup=handleInput(this)>
</div>
<div>
<label for="">Age</label>
<input type="number" name="age" id="age" onkeyup=handleInput(this)>
</div>
<div>
<label for="">Email</label>
<input type="text" name="email" id="email" onkeyup=handleInput(this)>
</div>
<div>
<label for="">Mobile</label>
<input type="number" name="mobile" id="number" onkeyup=handleInput(this)>
</div>
<div>
<button onclick=submitData()>Submit</button>
</div>
</div>
JavaScript:
<script>
const data = { };
function handleInput(e){
data[e.name] = e.value;
}
function submitData(){
console.log(data.fname); // Get the first name from the object
console.log(data); // return object
}
</script>

function handleValueChange() {
var y = document.getElementById('textbox_id').value;
var x = document.getElementById('result');
x.innerHTML = y;
}
function changeTextarea() {
var a = document.getElementById('text-area').value;
var b = document.getElementById('text-area-result');
b.innerHTML = a;
}
input {
padding: 5px;
}
p {
white-space: pre;
}
<input type="text" id="textbox_id" placeholder="Enter string here..." oninput="handleValueChange()">
<p id="result"></p>
<textarea name="" id="text-area" cols="20" rows="5" oninput="changeTextarea()"></textarea>
<p id="text-area-result"></p>

<input id="new" >
<button onselect="myFunction()">it</button>
<script>
function myFunction() {
document.getElementById("new").value = "a";
}
</script>

One can use the form.elements to get all elements in a form. If an element has id it can be found with .namedItem("id"). Example:
var myForm = document.getElementById("form1");
var text = myForm.elements.namedItem("searchTxt").value;
var url = "http://www.myurl.com/search/" + text;
Source: w3schools

function searchURL() {
window.location = 'http://www.myurl.com/search/' + searchTxt.value
}
So basically searchTxt.value will return the value of the input field with id='searchTxt'.

Short Answer
You can get the value of text input field using JavaScript with this code: input_text_value = console.log(document.getElementById("searchTxt").value)
More info
textObject has a property of value you can set and get this property.
To set you can assign a new value:
document.getElementById("searchTxt").value = "new value"

Simple JavaScript:
function copytext(text) {
var textField = document.createElement('textarea');
textField.innerText = text;
document.body.appendChild(textField);
textField.select();
document.execCommand('copy');
textField.remove();
}

How do I get the value of text input field using JavaScript?

I am working on a search with JavaScript. I would use a form, but it messes up something else on my page. I have this input text field:
<input name="searchTxt" type="text" maxlength="512" id="searchTxt" class="searchField"/>
And this is my JavaScript code:
<script type="text/javascript">
function searchURL(){
window.location = "http://www.myurl.com/search/" + (input text value);
}
</script>
How do I get the value from the text field into JavaScript?

There are various methods to get an input textbox value directly (without wrapping the input element inside a form element):
Method 1
document.getElementById('textbox_id').value to get the value of
desired box
For example
document.getElementById("searchTxt").value;
 
Note: Method 2,3,4 and 6 returns a collection of elements, so use [whole_number] to get the desired occurrence. For the first element, use [0],
for the second one use [1], and so on...
Method 2
Use
document.getElementsByClassName('class_name')[whole_number].value which returns a Live HTMLCollection
For example
document.getElementsByClassName("searchField")[0].value; if this is the first textbox in your page.
Method 3
Use document.getElementsByTagName('tag_name')[whole_number].value which also returns a live HTMLCollection
For example
document.getElementsByTagName("input")[0].value;, if this is the first textbox in your page.
Method 4
document.getElementsByName('name')[whole_number].value which also >returns a live NodeList
For example
document.getElementsByName("searchTxt")[0].value; if this is the first textbox with name 'searchtext' in your page.
Method 5
Use the powerful document.querySelector('selector').value which uses a CSS selector to select the element
For example
document.querySelector('#searchTxt').value; selected by id
document.querySelector('.searchField').value; selected by class
document.querySelector('input').value; selected by tagname
document.querySelector('[name="searchTxt"]').value; selected by name
Method 6
document.querySelectorAll('selector')[whole_number].value which also uses a CSS selector to select elements, but it returns all elements with that selector as a static Nodelist.
For example
document.querySelectorAll('#searchTxt')[0].value; selected by id
document.querySelectorAll('.searchField')[0].value; selected by class
document.querySelectorAll('input')[0].value; selected by tagname
document.querySelectorAll('[name="searchTxt"]')[0].value; selected by name
Support
Browser
Method1
Method2
Method3
Method4
Method5/6
IE6
Y(Buggy)
N
Y
Y(Buggy)
N
IE7
Y(Buggy)
N
Y
Y(Buggy)
N
IE8
Y
N
Y
Y(Buggy)
Y
IE9
Y
Y
Y
Y(Buggy)
Y
IE10
Y
Y
Y
Y
Y
FF3.0
Y
Y
Y
Y
N IE=Internet Explorer
FF3.5/FF3.6
Y
Y
Y
Y
Y FF=Mozilla Firefox
FF4b1
Y
Y
Y
Y
Y GC=Google Chrome
GC4/GC5
Y
Y
Y
Y
Y Y=YES,N=NO
Safari4/Safari5
Y
Y
Y
Y
Y
Opera10.10/
Opera10.53/
Y
Y
Y
Y(Buggy)
Y
Opera10.60
Opera 12
Y
Y
Y
Y
Y
Useful links
To see the support of these methods with all the bugs including more details click here
Difference Between Static collections and Live collections click Here
Difference Between NodeList and HTMLCollection click Here

//creates a listener for when you press a key
window.onkeyup = keyup;
//creates a global Javascript variable
var inputTextValue;
function keyup(e) {
//setting your input text to the global Javascript Variable for every key press
inputTextValue = e.target.value;
//listens for you to press the ENTER key, at which point your web address will change to the one you have input in the search box
if (e.keyCode == 13) {
window.location = "http://www.myurl.com/search/" + inputTextValue;
}
}
See this functioning in codepen.

I would create a variable to store the input like this:
var input = document.getElementById("input_id").value;
And then I would just use the variable to add the input value to the string.
= "Your string" + input;

You should be able to type:
var input = document.getElementById("searchTxt");
function searchURL() {
window.location = "http://www.myurl.com/search/" + input.value;
}
<input name="searchTxt" type="text" maxlength="512" id="searchTxt" class="searchField"/>
I'm sure there are better ways to do this, but this one seems to work across all browsers, and it requires minimal understanding of JavaScript to make, improve, and edit.

Also you can, call by tags names, like this: form_name.input_name.value;
So you will have the specific value of determined input in a specific form.

Short
You can read value by searchTxt.value
<input name="searchTxt" type="text" maxlength="512" id="searchTxt" class="searchField"/>
<script type="text/javascript">
function searchURL(){
console.log(searchTxt.value);
// window.location = "http://www.myurl.com/search/" + searchTxt.value;
}
</script>
<!-- SHORT ugly test code -->
<button class="search" onclick="searchURL()">Search</button>

<input type="text" onkeyup="trackChange(this.value)" id="myInput">
<script>
function trackChange(value) {
window.open("http://www.google.com/search?output=search&q=" + value)
}
</script>

Tested in Chrome and Firefox:
Get value by element id:
<input type="text" maxlength="512" id="searchTxt" class="searchField"/>
<input type="button" value="Get Value" onclick="alert(searchTxt.value)">
Set value in form element:
<form name="calc" id="calculator">
<input type="text" name="input">
<input type="button" value="Set Value" onclick="calc.input.value='Set Value'">
</form>
https://jsfiddle.net/tuq79821/
Also have a look at a JavaScript calculator implementation.
From #bugwheels94: when using this method, be aware of this issue.

If your input is in a form and you want to get the value after submit you can do like:
<form onsubmit="submitLoginForm(event)">
<input type="text" name="name">
<input type="password" name="password">
<input type="submit" value="Login">
</form>
<script type="text/javascript">
function submitLoginForm(event){
event.preventDefault();
console.log(event.target['name'].value);
console.log(event.target['password'].value);
}
</script>
Benefit of this way: Example your page have 2 form for input sender and receiver information.
If you don't use form for get value then
You can set two different id (or tag or name ...) for each field like sender-name and receiver-name, sender-address and receiver-address, ...
If you set the same value for two inputs, then after getElementsByName (or getElementsByTagName ...) you need to remember 0 or 1 is sender or receiver. Later, if you change the order of 2 form in HTML, you need to check this code again
If you use form, then you can use name, address, ...

You can use onkeyup when you have more than one input field. Suppose you have four or input. Then
document.getElementById('something').value is annoying. We need to write four lines to fetch the value of an input field.
So, you can create a function that store value in object on keyup or keydown event.
Example:
<div class="container">
<div>
<label for="">Name</label>
<input type="text" name="fname" id="fname" onkeyup=handleInput(this)>
</div>
<div>
<label for="">Age</label>
<input type="number" name="age" id="age" onkeyup=handleInput(this)>
</div>
<div>
<label for="">Email</label>
<input type="text" name="email" id="email" onkeyup=handleInput(this)>
</div>
<div>
<label for="">Mobile</label>
<input type="number" name="mobile" id="number" onkeyup=handleInput(this)>
</div>
<div>
<button onclick=submitData()>Submit</button>
</div>
</div>
JavaScript:
<script>
const data = { };
function handleInput(e){
data[e.name] = e.value;
}
function submitData(){
console.log(data.fname); // Get the first name from the object
console.log(data); // return object
}
</script>

function handleValueChange() {
var y = document.getElementById('textbox_id').value;
var x = document.getElementById('result');
x.innerHTML = y;
}
function changeTextarea() {
var a = document.getElementById('text-area').value;
var b = document.getElementById('text-area-result');
b.innerHTML = a;
}
input {
padding: 5px;
}
p {
white-space: pre;
}
<input type="text" id="textbox_id" placeholder="Enter string here..." oninput="handleValueChange()">
<p id="result"></p>
<textarea name="" id="text-area" cols="20" rows="5" oninput="changeTextarea()"></textarea>
<p id="text-area-result"></p>

<input id="new" >
<button onselect="myFunction()">it</button>
<script>
function myFunction() {
document.getElementById("new").value = "a";
}
</script>

One can use the form.elements to get all elements in a form. If an element has id it can be found with .namedItem("id"). Example:
var myForm = document.getElementById("form1");
var text = myForm.elements.namedItem("searchTxt").value;
var url = "http://www.myurl.com/search/" + text;
Source: w3schools

function searchURL() {
window.location = 'http://www.myurl.com/search/' + searchTxt.value
}
So basically searchTxt.value will return the value of the input field with id='searchTxt'.

Short Answer
You can get the value of text input field using JavaScript with this code: input_text_value = console.log(document.getElementById("searchTxt").value)
More info
textObject has a property of value you can set and get this property.
To set you can assign a new value:
document.getElementById("searchTxt").value = "new value"

Simple JavaScript:
function copytext(text) {
var textField = document.createElement('textarea');
textField.innerText = text;
document.body.appendChild(textField);
textField.select();
document.execCommand('copy');
textField.remove();
}

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