[英]JSP use contents of an array list in a drop down box
I have an arraylist
that is declared and populated in a JSP
file:我有一个
arraylist
一个声明,并在人口JSP
文件:
<% for(int i=0; i< GDI.getRow(); i++){
associatedLines[i] = GDI.getRow().get(i).getNumplanindex;
}
ArrayList<Integer> availableLines = new ArrayList<Integer>();
for(int i=0; i<associatedLines.length; i++){
if(associatedLines[i] == null){
availableLines.add(i);
}
}
%>
I would like to use the contents of availableLines in the dropdown list and be able to store the value selected to be used somewhere else.我想在下拉列表中使用availableLines的内容,并能够将选择的值存储在其他地方使用。
I am almost certain that I need to use JSTL
but I am not sure how to do it.我几乎可以肯定我需要使用
JSTL
但我不知道该怎么做。
Hopefully somebody can help.希望有人可以提供帮助。 Thanks!
谢谢!
You can add the bellow line just after the for
loop in your scriptlet:您可以在 scriptlet 中的
for
循环之后添加波纹管:
request.setAttribute("availableLines", availableLines);
And then you can use the availableLines
variable in your drop down list using JSTL
like bellow:然后您可以使用
JSTL
在下拉列表中使用availableLines
变量,如下所示:
<select>
<c:forEach var="line" items="${availableLines}">
<option><c:out value="${line}"/></option>
</c:forEach>
</select>
I think, this answers your original question.我想,这回答了你原来的问题。
Edit:编辑:
But one thing you should know that, writing scriptlet is deprecated for years!但是你应该知道的一件事是,编写 scriptlet 已被弃用多年! So it is advised to move your scriptlet code to your corresponding
servlet
.因此,建议将您的 scriptlet 代码移动到您相应的
servlet
。 Here is a step by step tutorial for Servlet
and jsp
for beginners. 这是初学者的
Servlet
和jsp
步教程。
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