如何将JS变量传递到INPUT语句的“ value =”参数中
[英]How do I pass a JS variable into the “value=” parameter of an INPUT statement
问题描述
The example below should display the value from the JS as the value in the INPUT statement but does not. 
下面的示例应将JS中的值显示为INPUT语句中的值，但不显示。
<html>
<body>
<script type="text/javascript">
var qty = 1;
if (qty<3)
{
var shipping=1.92;
var shp_method="USPS First Class Package";
}
else if (qty>=3 && qty<14)
{
var shipping=4.85;
var shp_method="USPS Small Flat Rate Package";
}
else
{
var shipping=10.82;
var shp_method="USPS Medium Flat Rate Package";
}
</script>
<input type="text" name="shp_method" value="<?=shp_method;?>" TEXT STYLE="text-align:center" readonly="readonly" size="30">
</body>
</html>
3 个解决方案
解决方案1
3 2010-12-26 08:56:20
The syntax you are using: 您使用的语法：
value="<?=shp_method;?>"
is valid only for PHP. 仅对PHP有效。
If you want to do with javascript, you can do something like this: 如果要使用javascript，可以执行以下操作：
document.getElementById('#textbodID').value = shp_method;
Your code should be like this: 您的代码应如下所示：
<script type="text/javascript">
window.onload = function(){
var qty = 1;
if (qty<3)
{
var shipping=1.92;
var shp_method="USPS First Class Package";
}
else if (qty>=3 && qty<14)
{
var shipping=4.85;
var shp_method="USPS Small Flat Rate Package";
}
else
{
var shipping=10.82;
var shp_method="USPS Medium Flat Rate Package";
}
document.getElementById('#textbodID').value = shp_method;
};
</script>
Where textbodID is assumed to be the id of your input field which can be assigned like this: 假设textbodID是您输入字段的id ，可以这样分配：
<input id="textbodID" />
解决方案2
1 2014-02-09 06:40:29
try like this: 尝试这样：
<input type="text" name="ye" id="yea"> //input box
<script type="text/javascript">
var mytime=new Date();
document.getElementById("yea").value=(mytime.getFullYear());
</script>
<input type="submit" value="Submit" name="submit">// use submit button to get input value
then use scriplet tag in same jsp page: 然后在同一jsp页面中使用scriplet标记：
like this: 像这样：
<% String y=request.getParameter("submit");
if(y.equals("Submit"))
{
String s=request.getParameter("ye");
System.out.println(s);
}
%>
after click submit you can see javascript value in your console. 单击提交后，您可以在控制台中看到javascript值。 then save this string value in your database and then u can access this String everywhere. 然后将此字符串值保存在数据库中，然后您可以在任何地方访问此字符串。 please don't copy and paste this example. 请不要复制并粘贴此示例。 just try to write in your page to avoid errors. 只需尝试在您的页面中编写以避免出现错误。
解决方案3
0 2010-12-26 09:11:17
First of all add an id attribute to the input. 首先，向输入添加一个id属性。 this will automatically set the value as soon as the page loads: 页面加载后，它将自动设置该值：
window.onload = function (){
var qty = 1;
if (qty<3)
{
var shipping=1.92;
var shp_method="USPS First Class Package";
}
else if (qty>=3 && qty<14)
{
var shipping=4.85;
var shp_method="USPS Small Flat Rate Package";
}
else
{
var shipping=10.82;
var shp_method="USPS Medium Flat Rate Package";
}
document.getElementById('inputId').value = shp_method;
}
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