Html 如何通过提交按钮传递参数？
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How can I pass a parameter via submit button?
提问by naikaustubh
In my code for an mini online book store i have a following line repeating 5 times with different value for 'name' parameter
在我的迷你在线书店代码中，我有以下一行重复 5 次，其中 'name' 参数的值不同
<input name="JSP-2" type="submit" value="Buy">
On clicking the button Buy, the application redirects to a file buy.jsp where it gets the value of name and displays corresponding details of the book.
单击 Buy 按钮后，应用程序重定向到一个文件 buy.jsp，在那里它获取 name 的值并显示该书的相应详细信息。
In my buy.jsp, I have included
在我的buy.jsp中，我已经包括
<% String bname= request.getParameter("name");
out.print(bname);
%>
But the name doesnt get assigned to bname and it shows the value as null. How do I pass a parameter from the submit type input? Please help.
但是名称没有分配给 bname 并且它显示值为空。如何从提交类型输入传递参数？请帮忙。
回答by Nivas
You have to pass the parameter in the request. Since you are having a form, and submitting the form, you can have a hidden field in the form called, say "submitType", and populate it whenever you click the button, using javascript. Then this will be available in the next request.
您必须在请求中传递参数。由于您有一个表单并提交表单，因此您可以在表单中创建一个隐藏字段，例如“submitType”，并在您单击按钮时使用 javascript 填充它。然后这将在下一个请求中可用。
Somewhere inside the form :<input type="hidden" name="submitType">
表格内的某处：<input type="hidden" name="submitType">
in the submit buttons:<input name="JSP-2" type="submit" onclick="setType('Buy')">
在提交按钮中：<input name="JSP-2" type="submit" onclick="setType('Buy')">
Javascript: formNameis the name of your form
Javascript： formName是表单的名称
<script>
function setType(type)
{
//formName is the name of your form, submitType is the name of the submit button.
document.forms["formName"].elements["submitType"].value = type;
//Alternately, you can access the button by its Id
document.getElementById("submitId").value = type;
}
</script>
