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How to get text box value in javascript?

Retrieving the value of a text box in JavaScript is a common task in web development. The value of a text box can be used for various purposes, such as displaying the input data to the user, saving it to a database, or processing it further in the application. There are several ways to get the value of a text box in JavaScript, depending on the type of element and the way it is defined in the HTML markup.

Method 1: Using the «value» property

To get the value of a text box in JavaScript using the «value» property, follow these steps:

1. First, select the text box element using its ID or class name. For example, if your text box has an ID of «myTextBox», you can select it using the following code:

const textBox = document.getElementById("myTextBox");

1. Once you have selected the text box element, you can access its value using the «value» property. For example, to get the value of the text box and store it in a variable called «textBoxValue», use the following code:

const textBoxValue = textBox.value;

1. You can then use the «textBoxValue» variable to perform any necessary operations on the text box value.

Here is the complete code example:

// Select the text box element const textBox = document.getElementById("myTextBox"); // Get the value of the text box const textBoxValue = textBox.value; // Use the text box value console.log("The value of the text box is: " + textBoxValue);

You can also use this method to set the value of a text box by assigning a value to the «value» property. For example, to set the value of the text box to «Hello, world!», use the following code:

textBox.value = "Hello, world!";

Overall, using the «value» property is a simple and effective way to get and set the value of a text box in JavaScript.

Method 2: Using the «document.getElementById()» method

To get the value of a text box in JavaScript using the document.getElementById() method, follow these steps:

input type="text" id="myTextBox">

1. Next, you can use the document.getElementById() method to get the text box element by its id attribute value. For example:

var textBox = document.getElementById("myTextBox");

var textBoxValue = textBox.value;

Here is an example function that demonstrates these steps:

function getTextBoxValue()  var textBox = document.getElementById("myTextBox"); var textBoxValue = textBox.value; console.log(textBoxValue); >

You can call this function to get the value of the text box and log it to the console.

button onclick="getTextBoxValue()">Get Text Box Valuebutton>

This is just one way to get the value of a text box in JavaScript using the document.getElementById() method. There are other methods available as well.

Method 3: Using the «document.querySelector()» method

To get the value of a text box in JavaScript using the document.querySelector() method, follow these steps:

1. Get the reference to the text box using the document.querySelector() method. You can do this by passing the CSS selector for the text box as an argument to the method. For example, if your text box has an ID of «myTextBox», you can get a reference to it like this:

const textBox = document.querySelector('#myTextBox');

1. Once you have a reference to the text box, you can get its value using the value property. For example:

const textBoxValue = textBox.value;

Here’s an example that puts it all together:

DOCTYPE html> html> head> title>Get Text Box Valuetitle> head> body> input type="text" id="myTextBox" value="Hello World!"> button onclick="getValue()">Get Valuebutton> script> function getValue()  const textBox = document.querySelector('#myTextBox'); const textBoxValue = textBox.value; alert(textBoxValue); > script> body> html>

In this example, we have an input text box with an ID of «myTextBox» and a default value of «Hello World!». We also have a button that, when clicked, calls the getValue() function. This function uses the document.querySelector() method to get a reference to the text box, and then gets its value using the value property. Finally, it displays the value in an alert box.

You can use this method to get the value of any text box on your page, as long as you know its CSS selector.

Method 4: Using the «document.getElementsByName()» method

To get the value of a text box in JavaScript using the document.getElementsByName() method, you can follow these steps:

1. First, you need to select the text box element using the document.getElementsByName() method. This method returns an array of elements with the specified name attribute.

var textBox = document.getElementsByName("textboxName")[0];

var textBoxValue = textBox.value;

Here is an example code snippet that demonstrates how to get the value of a text box using the document.getElementsByName() method:

!DOCTYPE html> html> body> input type="text" name="textboxName" id="textboxId" value="Hello World!"> button onclick="getValue()">Get Value/button> script> function getValue()  var textBox = document.getElementsByName("textboxName")[0]; var textBoxValue = textBox.value; alert(textBoxValue); > /script> /body> /html>

In this example, we have an input text box with the name attribute «textboxName» and an ID attribute «textboxId». We also have a button that calls the getValue() function when clicked. The getValue() function gets the value of the text box using the document.getElementsByName() method and displays it using the alert() method.

Источник

JavaScript methods to create and manipulate a textbox

This tutorial will help you to understand how you can create a textbox element as well as how you can manipulate various attributes of the textbox using JavaScript.

Create a textbox using JavaScript

• First, you need to use the createElement(«input») method of the document object to create an element.
• Then, you need to set the type attribute of the element that you’ve created to «text» using the Element.setAttribute() method.

The code inside the tag below shows how you can create a textbox and append it to the body element:

The resulting HTML document will be as follows:

Now that you know how you can create a textbox using JavaScript, let’s learn how you can manipulate various attributes of the textbox element.

Adding id attribute to the textbox using JavaScript

First, you may want to add an id attribute to the element so that you can easily fetch the element and retrieve its value. You can easily add the attribute by using the same setAttribute() method.

The code below shows how you can add the id attribute with «username» as its value:

Next, you may want to add a tag to the textbox to make it clear to users what the textbox is there for. You can do so by using the same createElement() method but replace the parameter with «label» .

For example, you may want to create a textbox so that users can enter their username . Here’s how you can create a label for that:

The for attribute of the element must match the id attribute of the element so that the label will be bound to the right element. The label text will be read by the device for the user.

You also need to set the innerHTML property of the element. The text inside will be read by screen-reader devices.

• Append the label before the textbox with the same appendChild() method
• Grab the textbox element using document.getElementById() method, then use insertBefore() method to insert the label before the textbox.

For the first choice, you need to add the code for creating the label before the textbox:

    Now you’re going to have the following output inside the tag:

As for the second choice, You need to call the insertBefore() method on the element’s parent, which is the element in this example.

• The newElement to be inserted
• And the existingElement where the newElement will be prepended.

The syntax for the method is as follows:

Let’s see how it works step by step. First, create the textbox element and append it to the HTML body:

  Then, create the label element:

Finally, how you can grab the textbox element and call body.insertBefore() method to insert the element above the textbox:

  The full code will be as shown below:

Now you’ve learned how to insert a label for the textbox element.

Manipulate textbox placeholder attribute using JavaScript

You may also want to set the placeholder attribute for the textbox to give your users a hint about the expected value for the textbox.

Since your textbox already has an id attribute, you can use the document.getElementById() method to fetch the element and use the setAttribute() method to set the placeholder:

And with that, your textbox will have the placeholder attribute set.

Manipulate the value attribute of the textbox using JavaScript

Finally, the input element also has the value property which you can use the get or set the value stored inside the textbox.

For example, type any text you want into the textbox and then fetch its value:

You can also set the value as follows:

And that’s how you can get or set the value property of a textbox 😉

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Источник

How to display value of textbox in JavaScript?

In this article we are going to learn about “How to display value of textbox in JavaScript”.

JavaScript allows you to create a textbox in two easy steps: In order to construct an element, you must first utilize the document object’s createElement(«input«) method.

The next step is to use the Element to change the type attribute of the newly generated element to «text”. Text is contained in text boxes, which can be altered and moved around. They are helpful for underlining or embellishing text.

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