javascript 如何调用jsp方法onclick/on form submit
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how to invoke a jsp method onclick/on form submit
提问by WordToTheWise
I have a jsp page with this code:
我有一个带有以下代码的jsp页面：
<script type="text/javascript">
function getWithdrawAmmount()
{
var withdraw=document.forms["WithdrawDeposit"]["AmountToWithdraw"].value;
document.getElementById('hidden').type = withdraw;
}
</script>
<form method="POST" name="WithdrawDeposit" onsubmit="getWithdrawAmmount()">
<table>
<tr><td><input type="text" size=5 name="AmountToWithdraw"></td>
<td><input type="button" value="Withdraw"></td></tr>
</table>
</form>
<input type="hidden" name="hidden" value="">
<% String AmountWithdraw = request.getParameter("hidden"); %>
<%!
public void Withdraw(){
int Amount = Integer.parseInt("AmountWithdraw");
Deposit deposit = new Deposit();
deposit.WithdrawMoney(AmountWithdraw);
} %>
I need to activate the Withdraw() method on form submit and get the text input. the javascript hold the value inserted in 'hidden' and i can access it later. but i can't call to : <% Withdraw(); %> from inside javascript.
我需要在表单提交时激活 Withdraw() 方法并获取文本输入。javascript 保存插入到“隐藏”中的值，我可以稍后访问它。但我不能打电话给：<% Withdraw(); %> 来自 javascript 内部。
how can i call Withdraw() after button click?
单击按钮后如何调用 Withdraw()？
10x
10倍
回答by epascarello
First off your line of code has issues
首先你的代码行有问题
document.getElementById('hidden').type = withdraw;
It is looking for an element with an id of hidden. Not a name, an id. So add an id to the element you are referencing.
它正在寻找一个 id 为 hidden 的元素。不是名字，是身。因此，为您正在引用的元素添加一个 id。
Second you are setting a type. Don't you want to set the value?
其次，您正在设置类型。你不想设置值吗？
So the HTML would look like
所以 HTML 看起来像
<input type="hidden" name="hidden" id="hidden" value="" />
and the JavaScript would be
JavaScript 将是
document.getElementById('hidden').value = withdraw;
Now if you want to call a function on the server, you either need to post back the form or make an Ajax call.
现在，如果要调用服务器上的函数，则需要回发表单或进行 Ajax 调用。
