Javascript – Write to textarea when enter key is pressed

enterformsjavascriptkeysubmit

I have a textarea, which will handle output, and a textfield which will handle user input.

Focus will be entirely on the input field.
I can't make it so that the user input field will add text when the form is submitted (enter key is pressed). It will only work if there is a button and this is clicked. How do I solve this issue?

Below is the code i'm trying for the enter key submit.

<html>
<head>
<script type="text/javascript">
  function addtxt(input) {
    var obj=document.getElementById(input)
    var txt=document.createTextNode("blah blah")
    obj.appendChild(txt)
  }
</script>
</head>
<body>
<textarea id="textarea1"></textarea>
<br><input type="text" onSubmit="addtxt('textarea1');">
</body>
</html>

Best Answer

This will do the job. Also, you should deal with the value property of the textarea rather than appending text nodes to it: if the user changes the textarea's value at all, changing its child nodes afterwards will have no effect. If you want the textarea to be read-only, add a readonly attribute: <textarea id="textarea1" readonly></textarea>.

<script type="text/javascript">
    function inputKeyDown(evt, input) {
        if (evt.keyCode == 13) {
            var textarea = document.getElementById("textarea1");
            textarea.value += "\n" + input.value;
            input.value = ""; // I'm guessing you may want this
            return false;
        }
    }
</script>

<input type="text" onkeydown="return inputKeyDown(event, this);">

Related Solutions

Javascript – Trigger a button click with JavaScript on the Enter key in a text box

In jQuery, the following would work:

$("#id_of_textbox").keyup(function(event) {
    if (event.keyCode === 13) {
        $("#id_of_button").click();
    }
});

$("#pw").keyup(function(event) {
    if (event.keyCode === 13) {
        $("#myButton").click();
    }
});

$("#myButton").click(function() {
  alert("Button code executed.");
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Username:<input id="username" type="text"><br>
Password:&nbsp;<input id="pw" type="password"><br>
<button id="myButton">Submit</button>

Or in plain JavaScript, the following would work:

document.getElementById("id_of_textbox")
    .addEventListener("keyup", function(event) {
    event.preventDefault();
    if (event.keyCode === 13) {
        document.getElementById("id_of_button").click();
    }
});

document.getElementById("pw")
    .addEventListener("keyup", function(event) {
    event.preventDefault();
    if (event.keyCode === 13) {
        document.getElementById("myButton").click();
    }
});

function buttonCode()
{
  alert("Button code executed.");
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Username:<input id="username" type="text"><br>
Password:&nbsp;<input id="pw" type="password"><br>
<button id="myButton" onclick="buttonCode()">Submit</button>

Javascript – When should I use double or single quotes in JavaScript

The most likely reason for use of single vs. double in different libraries is programmer preference and/or API consistency. Other than being consistent, use whichever best suits the string.

Using the other type of quote as a literal:

alert('Say "Hello"');
alert("Say 'Hello'");

This can get complicated:

alert("It's \"game\" time.");
alert('It\'s "game" time.');

Another option, new in ECMAScript 6, is template literals which use the backtick character:

alert(`Use "double" and 'single' quotes in the same string`);
alert(`Escape the \` back-tick character and the \${ dollar-brace sequence in a string`);

Template literals offer a clean syntax for: variable interpolation, multi-line strings, and more.

Note that JSON is formally specified to use double quotes, which may be worth considering depending on system requirements.

Best Answer

Related Solutions

Javascript – Trigger a button click with JavaScript on the Enter key in a text box

Javascript – When should I use double or single quotes in JavaScript

Related Topic