Javascript prepend to textarea

Add Text to a Textarea or Text Field

This page shows you to how to add (append) or replace text in a text area or text field. In the example below, the new text is entered in the left text area and added to the one on the right. We will also look at other options for acquiring the new text.

Step 1 — Create Text Area(s)

Use the following code to create the form and text areas. Modify the layout and names to suit your needs (but remember to change the function code as well if you do).

 
 Add to Existing Text 
 Replace Existing Text
 
 

Step 2 — Create Function

Insert the following code into the page head:

More Options

To acquire the new text from something other than a text field, modify the newtext variable. For example:

// Pre-defined text: var newtext = "This is the new text"; // Drop-Menu: var newtext = myform.mymenu.options[myform.mymenu.selectedIndex].value; // Prompt: var newtext = prompt('Enter New Text Here:', '');

If you don’t need to ask the user whether to replace or append the text, use the following simplified function:

This example appends the new text to the existing text. To replace the existing text instead, remove the «+» sign.

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Javascript prepend to textarea

Last updated: Jan 12, 2023
Reading time · 2 min

# Table of Contents

# Append text to Textarea using JavaScript

To add text to a textarea, access the value property on the element and set it to its current value plus the text to be appended.

The value property can be used to get and set the content of a textarea element.

Here is the HTML for the examples.

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DOCTYPE html> html lang="en"> head> title>bobbyhadz.comtitle> meta charset="UTF-8" /> head> body> textarea id="message" rows="5" cols="30">textarea> button id="btn">Append textbutton> script src="index.js"> script> body> html> 

And here is the related JavaScript code.

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const textarea = document.getElementById('message'); // ✅ Append text textarea.value += 'Appended text'; const btn = document.getElementById('btn'); // ✅ Append text on button click btn.addEventListener('click', function handleClick()  textarea.value += 'Appended text'; >); 

We used the value property of the textarea element to append text to it.

These two lines achieve the same result.

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const textarea = document.getElementById('message'); textarea.value += 'Appended text'; textarea.value = textarea.value + 'Appended text'; 

Both of them append the text to the end of the current value of the textarea element.

# Append text to a textarea element on click

To append text to a textarea element on click:

1. Add a click event listener to an element.
2. Each time the element is clicked, update the value of the textarea element.

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const textarea = document.getElementById('message'); const btn = document.getElementById('btn'); // ✅ Append text on button click btn.addEventListener('click', function handleClick()  textarea.value += 'Appended text'; >); 

The handleClick function is invoked every time the user clicks the button.

# Checking if the text is already contained in the textarea

You can also check if the text is already contained in the textarea , so you don’t add it twice if the user clicks on the button multiple times.

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const textarea = document.getElementById('message'); const btn = document.getElementById('btn'); btn.addEventListener('click', function handleClick()  const text = 'Text to append'; if (!textarea.value.includes(text))  textarea.value += text; > >); 

We used the includes() method to check if the text we want to append is already contained in the value of the textarea.

# Checking if the value of the textarea ends with the text

You can also be more specific and check if the value of the textarea ends with the text.

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const textarea = document.getElementById('message'); const btn = document.getElementById('btn'); btn.addEventListener('click', function handleClick()  const text = 'Text to append'; if (!textarea.value.endsWith(text))  textarea.value += text; > >); 

# Additional Resources

You can learn more about the related topics by checking out the following tutorials:

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How to append text to Textarea using JavaScript

Sometimes we don’t want to change the content of a textarea, but we want to append some content to the end of the content value of that textarea. So this is what we will do in this example.

To append text to textarea ,we will use value property (The innerHTML property can be used ) and we must set the current value of the textarea plus the text to be appended.

function changeText()< document.getElementById("my-textarea").value += "This text is appended."; >

Append text to textarea to a new line.

Many times the text may need to be added to a new line. So it is good to know. Where you want to break the line use \n character.

Append text to textarea in a new line.

textarea id="my-textarea" cols="40" rows="6">/textarea> function appendText()< document.getElementById("my-textarea").value += "\nAppended text."; > 

Add text to textarea using innerHTML property.

textarea id="my-textarea" cols="40" rows="6">/textarea> button id="btn">Click Me/button> script> document.getElementById("btn").addEventListener('click', () => < document.getElementById("my-textarea").innerHTML += ' Appended text'; >); /script>

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How To Append Text To Textarea Using JavaScript?

The HTML tag is used to define a multiline text input field. Long text can be entered and displayed with it. So how to append text to textarea using JavaScript? Continue reading the article to know.

Four ways to append text to textarea using JavaScript

We will guide you through the following 4 ways:

Using value property

We have already introduced you to the syntax of the value property. You can read it in this article.

Appending text to textarea is very simple, get the textarea element and perform the += operation on its value property.

To make the example more intuitive, let’s do a simple but very cool effect that appends text on a button click:

// Get textarea and button elements const textArea = document.querySelector("textarea"); const btn = document.querySelector(".btn"); // Click to append text to the textarea btn.addEventListener("click", () => < // Insert text to the textarea using the value property textArea.value += " learnshareit.com"; >);

Using textContent property

To learn more about the syntax of the textContent property, you can read more here.

Like the above, we will use textContent to append text to textarea by performing string concatenation of the textContent property with the text we want to append. Like this:

// Get textarea and button elements const textArea = document.querySelector("textarea"); const btn = document.querySelector(".btn"); // Click to append text to the textarea btn.addEventListener("click", () => < // Insert text to the textarea using the textContent property textArea.textContent += " learnshareit.com"; >);

Using append() function

Append() will insert Node objects or string objects after the element calling it.

We can use append() to append text to textarea by calling it on the textarea element. Like this:

// Get textarea and button elements const textArea = document.querySelector("textarea"); const btn = document.querySelector(".btn"); // Click to append text to the textarea btn.addEventListener("click", () => < // Insert text to the textarea using append() function textArea.append(" a nice", " day!"); >);

Specify the text to append

This time, we’re going to do a more complex example. We’ll use the Event.target of the click event. To specify the text to be appended to the textarea. The target attribute of the click event will point to the element being clicked, so we can quickly get the value of that object using the textContent property. Look closely at the example below to understand better:

 
Visit learnshareit.com to learn: 
 
 

// Get textarea and button group elements const textArea = document.querySelector("textarea"); const btnGroup = document.querySelector(".btn-group"); // Click to append text to the textarea btnGroup.addEventListener("click", (e) => < // Use e.target to specify the text to append textArea.value += e.target.textContent; >);

Summary

In summary, there are so many ways to append text to Textarea using JavaScript that it’s impossible to list them all in one article. If you have a better way, please share it below.

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How to Prepend and Append in JavaScript textarea dynamically without submit button

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