如何从文本区域获取值并将其存储在变量中
[英]How to get a value from a textarea and store it in a variable
问题描述
I need to type something inside a textarea, then take the text that was written there and store it in a variable.
我需要在 textarea 中输入一些内容，然后将在那里写入的文本存储在一个变量中。
Example:例子：
I type "Hello" in a textarea.我在 textarea 中输入“你好”。
I want the variable to be: x = "Hello"我希望变量为： x = "Hello"
I've tried我试过了
document.getElementById("someId").value;
which doesn't work for me这对我不起作用
<textarea id="ide" rows="13" cols="60"></textarea>
Seems I didnt explain the question right, I wanted to store the value everytime you type but I found a way:似乎我没有正确解释问题，我想在每次键入时存储该值，但我找到了一种方法：
function val(e) {
console.log(e.value);
}
<textarea id="ide" rows="13" cols="60" onkeyup="val(this);"></textarea>
and this is the answer in case anyone wondered, thanks for the replies!这是万一有人想知道的答案，感谢您的回复！
function val(e) {
var someText = e.value;
console.log(someText )
if (someText == "text") {
document.getElementById("msg").innerHTML="new text";
}
}
4 个解决方案
解决方案1
0 2019-09-05 13:13:47
var valueInVar = ''; function textareaToVar(){ valueInVar = document.getElementById("myTextarea").value; alert(valueInVar); }
<textarea id="myTextarea" onfocusout="textareaToVar()"></textarea>
解决方案2
0 2019-09-05 13:15:37
<!DOCTYPE html>
<html>
<body>
Address:<br>
<textarea id="ide" rows="13" cols="60">Hello</textarea>
<p>Click the button to change the contents of the text area.</p>
<button type="button" onclick="myFunction()">Try it</button>
<script>
function myFunction() {
var x = document.getElementById("ide").value;
alert(x);
}
</script>
</body>
</html>
解决方案3
0 2019-09-05 13:29:54
Your ID is different it is "someid" in your javascript and "ide" in your HTML.您的 ID 是不同的，它是您的 javascript 中的“someid”和 HTML 中的“ide”。 You need to change your code to:您需要将代码更改为：
<textarea id="ide" rows="13" cols="60"></textarea>
document.getElementById("ide").value;
You also need to make sure your DOM is loaded before trying to get the value.在尝试获取值之前，您还需要确保您的 DOM 已加载。
<script type="text/javascript">
window.onload = function() {
document.getElementById("delete").onclick = function() {myFunction()};
function myFunction() {
//your code goes here
alert('Alert message here');
}
};
</script>
解决方案4
0 2019-09-05 13:38:24
You need to tell your program when you want the contents of textarea to be put into a variable.当您希望将 textarea 的内容放入变量时，您需要告诉您的程序。
For example, if you want it to happen every time you type something you need to add an 'input' event listener to the textarea:例如，如果您希望每次键入内容时都发生这种情况，则需要向 textarea 添加一个 'input' 事件侦听器：
let text; let textarea = document.getElementById('ide'); textarea.addEventListener('input', function getText() { text = textarea.value; });
If you want to get the value when a button is clicked, then add click event to that button.如果要在单击按钮时获取值，请向该按钮添加单击事件。
let text; let textarea = document.getElementById('ide'); let button = document.getElementById("btn"); button.addEventListener('click', function getText() { text = textarea.value; });
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.