Javascript document.getElementById
[英]Javascript document.getElementById
问题描述
Im not sure why this is not working, can someone please tell me why? 
我不确定为什么这行不通，有人可以告诉我为什么吗？
var red = [0, 100, 63];
var orange = [40, 100, 60];
var green = [75, 100, 40];
var blue = [196, 77, 55];
var purple = [280, 50, 60];
var myName = document.getElementById('mytext');
letterColors = [ red, orange, green, blue, purple ]
if(10 > 3) {
bubbleShape = "circle";
}
else {
bubbleShape = "square";
}
drawName(myName, letterColors);
bounceBubbles()
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="//code.jquery.com/jquery-1.10.2.min.js"></script>
<script type="text/javascript" src="alphabet.js"></script>
</head>
<body>
<canvas id="myCanvas"></canvas>
<script type="text/javascript" src="bubbles.js"></script>
<script type="text/javascript" src="main.js"></script>
<head>
Name: <input type="text" name="mytext"><br>
</form>
</head>
<body>
</body>
</html>
I am trying to get the variable "myname" to be what the user types into the text box. 我正在尝试获取变量“ myname”作为用户在文本框中键入的内容。
3 个解决方案
解决方案1
1 已采纳 2014-07-03 18:15:25
You are getting the reference to the element, but then you need to use the value property to the value from the element: 您正在获得对该元素的引用，但随后需要将value属性用于该元素的值：
var myName = document.getElementById('mytext').value;
You need to set the id of the element to access it using the getElementById method: 您需要使用getElementById方法设置元素的ID才能访问它：
<input type="text" name="mytext" id="mytext">
Also, it's not clear where the Javascript code is executed in the code, but if the code is the entire content of the alphabet.js , bubble.js or main.js file, then you are running the code before the content of the body has been parsed. 此外，它在JavaScript代码中的代码执行尚不明确，但如果代码是的全部内容alphabet.js ， bubble.js或main.js文件，那么你身体的内容之前运行的代码已解析。 To run the code after the content is loaded, use the load event: 要在加载内容之后运行代码，请使用load事件：
window.onload = function(){
// code that uses the content goes in here
};
解决方案2
0 2014-07-03 18:17:24
将ID属性设置为您的输入标签
<input type="text" id="mytext" name="mytext">
解决方案3
0 2014-07-03 18:19:43
Change 更改
<input type="text" name="mytext">
To 至
<input type="text" name="mytext" id="mytext">
Then use 然后使用
var myName = document.getElementById('mytext').value;
Like @Guffaa suggested. 就像@Guffaa建议的那样。
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