javascript 使用jQuery自动计算文本框的值
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/26422548/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Calculate values of textboxes automatically using jQuery
提问by kristyan markes
I want to calculate the value of the 1st 2 text boxes without a command button Example i have 3 text boxes.
我想在没有命令按钮的情况下计算第一个 2 个文本框的值示例我有 3 个文本框。
The first 2, where the numbers will be inputed and the last 1 will be the sum or product and so on. Now i want it to auto compute. For example i have inputed values 2 and 3 on the 1st 2 text boxes then automatically the sum or product or whatever result will be displayed on the 3rd text box. How am i able to do this? Thanks
前 2 个，将输入数字，最后一个 1 将是总和或乘积等。现在我希望它自动计算。例如，我在第一个 2 个文本框中输入了值 2 和 3，然后总和或乘积或任何结果将自动显示在第三个文本框中。我怎么能做到这一点？谢谢
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$('#texttwo').keyup(function(){
var textone;
var texttwo;
textone = parseFloat($('#textone').val());
texttwo = parseFloat($('#texttwo').val());
var result = textone + texttwo;
$('#result').val(result.toFixed(2));
});
</script>
</head>
<body>
<input type="text" name="value1" id="textone">
<input type="text" name="value2" id="texttwo">
<input type="text" name="result" id="result">
</body>
</head>
采纳答案by baao
You can achieve this by using jQuery.
Include jQuery in your project by putting this in your <head>
您可以通过使用 jQuery 来实现这一点。通过将其放入您的项目中，将 jQuery 包含在您的项目中<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
Then, at the end of the file:
然后，在文件末尾：
<script>
$('#texttwo').keyup(function(){
var textone;
var texttwo;
textone = parseFloat($('#textone').val());
texttwo = parseFloat($('#texttwo').val());
var result = textone + texttwo;
$('#result').val(result.toFixed(2));
});
</script>
This will give you the result when ever you change the value of the second box.
当您更改第二个框的值时，这将为您提供结果。
You will need to do this, too:
你也需要这样做：
Change
改变
<input type=text name=value1>
<input type=text name=value2>
<input type=text name=result>
to:
到：
<input type="text" name="value1" id="textone">
<input type="text" name="value2" id="texttwo">
<input type="text" name="result" id="result">
EDIT
编辑
This is my entire file:
这是我的整个文件：
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<input type="text" name="value1" id="textone">
<input type="text" name="value2" id="texttwo">
<input type="text" name="result" id="result">
<script>
$('#texttwo').keyup(function(){
var textone;
var texttwo;
textone = parseFloat($('#textone').val());
texttwo = parseFloat($('#texttwo').val());
var result = textone + texttwo;
$('#result').val(result.toFixed(2));
});
</script>
