How to save user input into a variable in HTML and JavaScript
Question
I am making a game and at the start it asks for your name, I want this name to be saved as variable.
Here is my HTML code:
<form id="form" onsubmit="return false;">
<input style=position:absolute;top:80%;left:5%;width:40%; type="text" id="userInput">
<input style=position:absolute;top:50%;left:5%;width:40%; type="submit" onclick="name()">
</form>
And here is my JavaScript Code
function name()
{
var input = document.getElementById("userInput");
alert(input);
}
8 answers
solution1
28 ACCPTED 2013-07-02 19:07:26
It doesn't work because name is a reserved word in JavaScript. Change the function name to something else.
Seehttp://www.quackit.com/javascript/javascript_reserved_words.cfm
<form id="form" onsubmit="return false;">
<input style="position:absolute; top:80%; left:5%; width:40%;" type="text" id="userInput" />
<input style="position:absolute; top:50%; left:5%; width:40%;" type="submit" onclick="othername();" />
</form>
function othername() {
var input = document.getElementById("userInput").value;
alert(input);
}
solution2
8 2015-09-07 22:41:31
First, make your markup more portable/reusable. I also set the button's type to 'button' instead of using the onsubmit attribute. You can toggle the type attribute to submit if the form needs to interact with a server.
<div class='wrapper'>
<form id='nameForm'>
<div class='form-uname'>
<label id='nameLable' for='nameField'>Create a username:</label>
<input id='nameField' type='text' maxlength='25'></input>
</div>
<div class='form-sub'>
<button id='subButton' type='button'>Print your name!</button>
</div>
</form>
<div>
<p id='result'></p></div>
</div>
Next write a general function for retrieving the username into a variable. It checks to make sure the variable holding the username has it least three characters in it. You can change this to whatever constant you want.
function getUserName() {
var nameField = document.getElementById('nameField').value;
var result = document.getElementById('result');
if (nameField.length < 3) {
result.textContent = 'Username must contain at least 3 characters';
//alert('Username must contain at least 3 characters');
} else {
result.textContent = 'Your username is: ' + nameField;
//alert(nameField);
}
}
Next, I created an event listener for the button. It's generally considered the bad practice to have inline js calls.
var subButton = document.getElementById('subButton');
subButton.addEventListener('click', getUserName, false);
Here is a working and lightly styled demo:
solution3
3 2013-07-02 18:55:02
Change your javascript to:
var input = document.getElementById('userInput').value;
This will get the value that has been types into the text box, not a DOM object
solution4
2 2019-01-04 10:32:40
You can use PHP and JavaScript Together:
<input type="hidden" id="CatId" value="<?php echo $categoryId; ?>">
Now Update the JavaScript:
var categoryId = document.getElementById('CatId').value;
solution5
1 2019-05-22 19:47:48
I found this to work best for me try this fiddle
document.getElementById("btnmyNumber").addEventListener("click", myFunctionVar); function myFunctionVar() { var numberr = parseInt(document.getElementById("myNumber").value, 10); // alert(numberr); if ( numberr > 1) { document.getElementById("minusE5").style.display = "none"; }}
<form onsubmit="return false;"> <input class="button button3" type="number" id="myNumber" value="" min="0" max="30"> <input type="submit" id="btnmyNumber"> </form>solution6
1 2019-11-30 10:01:20
<html>
<input type="text" placeholder ="username" id="userinput">
<br>
<input type="password" placeholder="password">
<br>
<button type="submit" onclick="myfunc()" id="demo">click me</button>
<script type="text/javascript">
function myfunc() {
var input = document.getElementById('userinput');
alert(input.value);
}
</script>
</html>
solution7
1 2020-12-23 10:25:02
I mean a prompt script would work if the variable was not needed for the HTML aspect, even then in certain situations, a function could be used.
var save_user_input = prompt('what needs to be saved?'); //^ makes a variable of the prompt's answer if (save_user_input == null) { //^ if the answer is null, it is nothing //however, if it is nothing, it is cancelled (as seen below). If it is "null" it is what the user said, then assigned to the variable(i think), but also null as in nothing in the prompt answer window, but ok pressed. So you cant do an or "null" (which would look like: if (save_user_input == null || "null") {)because (I also don't really know if this is right) the variable is "null". Very confusing alert("cancelled"); //^ alerts the user the cancel button was pressed. No long explanation this time. } //^ is an end for the if (i got stumped as to why it wasn't working and then realised this. very important to remember.) else { alert(save_user_input + " is what you said"); //^ alerts the user the variable and adds the string " is what you said" on the end }
solution8
0 2022-11-16 17:56:03
<.DOCTYPE html> <html> <body> <p><input type="text" placeholder ="username" id="userinput"> <button id="demo">click me</button></p> <script> document.getElementById("demo").onclick = function(){ var user = document.getElementById("userinput");value; alert(user); } </script> </body> </html>
click me
<script>
document.getElementById("demo").onclick = function(){
var user = document.getElementById("userinput").value;
alert(user);
}
</script>
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