Question

我正在制作游戏，并在开始时询问你的名字。我希望将此名称保存为varible。我有这个HTML代码：

<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>

这是javascript部分：

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

Answer 1

它不起作用，因为name是JavaScript中的保留字。将函数名称更改为其他名称。

请参阅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);
}

Answer 2

首先，让您的标记更具可移植性/可重用性。我还将按钮的类型设置为'button'，而不是使用onsubmit属性。如果表单需要与服务器进行交互，您可以将type属性切换为submit。

<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>

接下来编写一个通用函数，用于将用户名检索到变量中。它会检查以确保持有用户名的变量中至少包含三个字符。您可以将其更改为您想要的任何常量。

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);
}
}

接下来，我为按钮创建了一个事件监听器。通常认为使用内联js调用是不好的做法。

var subButton = document.getElementById('subButton');
subButton.addEventListener('click', getUserName, false);

这是一个工作轻巧的演示：

CodePen demo of this answer.

Answer 3

将您的javascript更改为：

var input = document.getElementById('userInput').value;

这会将类型的值输入文本框，而不是DOM对象

Answer 4

就像我在PHP和JavaScript上使用的一样：

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

更新JavaScript：

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

Answer 5

我发现这对我来说最有效 https://jsfiddle.net/Lu92akv6/ [我发现这个对我有用，请尝试这个小提琴] [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>

Answer 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>

Answer 7

我的意思是，如果 HTML 方面不需要该变量，则提示脚本将起作用，即使在某些情况下，也可以使用函数。

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
}

如何将用户输入保存到html和js中的变量中

7 个答案: