将html值传递给javascript函数
[英]Passing html values into javascript functions
问题描述
I was making a javascript function in which I need to confirm the input. 
我正在制作一个javascript函数，我需要确认输入。 I wrote the following code but its giving negative value ie "else" part even if i enter a valid value. 我写了下面的代码，但即使输入有效值，它给出负值即“其他”部分。 Can some one please suggest a solution? 有人可以建议一个解决方案吗？
Html file: Html文件：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Javascript App</title>
<script type="text/javascript" src="app1.js">
</script>
</head>
<body><h1 id="heading1" style="text-align:center; height:auto; width:auto; font-family:'Arial Black', Gadget, sans-serif">Determinant of a nxn matrix</h1>
<p id="paragraph1" style="font-family:'Arial Black', Gadget, sans-serif"> This program allows you to compute the determinant of a nxn matrix</p>
<p>
Input the order of the matrix
<br />
<input type="text" maxlength="3" name="value" />
<input type="button" value="submit" onclick="verifyorder(value)" />
</p>
<p id="error"></p>
<p id="detspace"></p>
</body>
</html>
Javascript File: Javascript文件：
function verifyorder(order){
;
if(order>0){
return true;
}
else{
alert("Sorry, you need to enter a positive integer value, try again");
document.getElementById('error').innerHTML="Sorry, you need to enter a positive integer value, try again";
}
}
4 个解决方案
解决方案1
21 2011-03-15 18:09:32
给文本框一个id为“txtValue”并将输入按钮声明更改为以下内容：
<input type="button" value="submit" onclick="verifyorder(document.getElementById('txtValue').value)" />
解决方案2
5 已采纳 2011-03-15 18:04:14
Here is the JSfiddle Demo 这是JSfiddle演示
I changed your HTML and give your input textfield an id of value. 我更改了您的HTML，并为您的输入文本字段提供了有价值的ID。 I removed the passed param for your verifyorder function, and instead grab the content of your textfield by using document.getElementById(); 我删除了验证顺序函数的传递参数，而是使用document.getElementById（）获取文本字段的内容。 then i convert the str into value with +order so you can check if it's greater than zero: 然后我用+order将str转换为值，这样你就可以检查它是否大于零：
<input type="text" maxlength="3" name="value" id='value' />
<input type="button" value="submit" onclick="verifyorder()" />
</p>
<p id="error"></p>
<p id="detspace"></p>
function verifyorder() {
var order = document.getElementById('value').value;
if (+order > 0) {
alert(+order);
return true;
}
else {
alert("Sorry, you need to enter a positive integer value, try again");
document.getElementById('error').innerHTML = "Sorry, you need to enter a positive integer value, try again";
}
}
解决方案3
0 2017-05-31 12:50:18
只需在输入文本字段中输入id属性 -
<input type="text" maxlength="3" name="value" id="value" />
解决方案4
-3 2011-03-15 18:03:56
尝试： if(parseInt(order)>0){....
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