分享程序员开发的那些事...
更新时间：2023-08-22 22:14:10
你没有得到它。现在，你在哪里得到这个document.txtBox.box1？
这样做：textBox = document .getElementById（ txtBox.box1\" 跨度>）; // 现在可以通过以下功能访问
function someTest（）{
alert（textBox.value）;
}
textBox.addEventListener（ onkeyup，someTest ， false ）;
我明白这仅用于测试。在现实生活中，你可以使用带有参数的事件处理程序，或者在元素typw上设置处理程序，或者更好的jQuery方法。
如果你需要学习jQuery（强烈推荐），请请参阅：
http://en.wikipedia.org/wiki/JQuery [ ^ ]，
http://jquery.com [ ^ ]，
http://learn.jquery.com [ ^ ]，
http://learn.jquery.com/using-jquery-core [ ^ ]，
http://learn.jquery.com/about-jquery / how-jquery-works [ ^ ]（从这里开始）。
要在HTML中添加处理程序，请使用类似< 输入 type = text onkeyup = someTest（）; / >
-SA
i'm new to this and this is my Question i have html file and extended JavaScript file
html file has one textarea i need get every letter when i type textarea show as a alertbox with that text (testing purposes)
i use the addEventListener to get event but it's not works
can you please show where the wrong in my code
my html file looks like this
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<script src="script.js"></script>
<form name="txtBox" id="txtBox">
<textarea style="font-size: 12pt; width: 500px;" id="box1" rows="7"></textarea>
</form>
</body>
</html>
My Extended JavaScript file looks like this
function textfunc()
{
var text = document.txtBox.box1.value;
alert(text);
// rest of function is here
}
document.getElementById("txtBox.box1").addEventListener("onkeyup",textfunc,false);
You are no getting it. Now, where did you get thisdocument.txtBox.box1?
Do this:textBox = document.getElementById("txtBox.box1"); // now it's accessible by the function below function someTest() { alert(textBox.value); } textBox.addEventListener("onkeyup", someTest, false);
I understand this is just for testing. In real life, you can use the event handler with a parameter, or setup the handler on the element typw, or, even better jQuery approach.
If you need to learn jQuery (highly recommended), please see:
http://en.wikipedia.org/wiki/JQuery[^],
http://jquery.com[^],
http://learn.jquery.com[^],
http://learn.jquery.com/using-jquery-core[^],
http://learn.jquery.com/about-jquery/how-jquery-works[^] (start from here).
To add a handler in HTML, use something like<input type="text" onkeyup="someTest();" />
—SA