How to save user input into a variable in html and js

问题

i am making a game and at the start it asks for your name. I want this name to be saved as varible. i have this 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 this is javascript part:

function name()
{
var input = document.getElementById("userInput");
alert(input);
}

回答1:

It doesn't work because name is a reserved word in JavaScript. Change the function name to something else.

See http://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);
}

回答2:

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:

CodePen demo of this answer.

回答3:

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

回答4:

Like I use on PHP and JavaScript:

<input type="hidden" id="CatId" value="<?php echo $categoryId; ?>">

Update the JavaScript:

var categoryId = document.getElementById('CatId').value;

回答5:

I found this to work best for me https://jsfiddle.net/Lu92akv6/ [I found this to work for me try this fiddle][1]

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>

回答6:

<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>

来源：https://stackoverflow.com/questions/17433557/how-to-save-user-input-into-a-variable-in-html-and-js

标签

javascript

html

user-input