JSTL-预选dropwdown值 [英] JSTL - preselect dropwdown value

问题描述

我有一个来自外部系统的java变量.我需要根据接收到的值预先选择dorpdown.

I have a java variable coming from an external system. I need to preselect the dorpdown based on the value received.

我正在尝试测试以下代码，但仍无法正常工作.

I am trying to test the below code but still not working.

//String myPaymentType ="I";

//String myPaymentType = "I";

//下拉菜单的值为"，I，R，IR

//Drop down has values as "",I,R,IR

<select name="paymentType" id="paymentType" class="form-control">
       <c:forEach var="paymentType" items="${paymentTypes}">
        <option <c:if test='${paymentType.paymentValue == myPaymentType}' >selected</c:if>
          value="${paymentType.paymentValue}" >${paymentType.paymentDesc}</option>
      </c:forEach>
    </select>                                                       

//PaymentType.Java

//PaymentType.Java

 private String paymentValue;
private String paymentDesc;
public PaymentType(String paymentValue, String paymentDesc) {
    super();
    this.paymentValue = paymentValue;
    this.paymentDesc = paymentDesc;
}
public String getPaymentValue() {
    return paymentValue;
}
public void setPaymentValue(String paymentValue) {
    this.paymentValue = paymentValue;
}
public String getPaymentDesc() {
    return paymentDesc;
}
public void setPaymentDesc(String paymentDesc) {
    this.paymentDesc = paymentDesc;
}

//PaymentTYpes是PaymentType对象的ArraList

//PaymentTYpes is an ArraList of PaymentType objects

    PaymentType paymentType1 = new PaymentType("","Select Payment Type");
        PaymentType paymentType2 = new PaymentType("I","Initial");
        PaymentType paymentType3 = new PaymentType("R","Recurring");
        PaymentType paymentType4 = new PaymentType("IR","Intial & Recurring");
        PaymentType paymentType5 = new PaymentType("O","Onetime");

        paymentTypes.add(0,paymentType1);
        paymentTypes.add(1,paymentType2);
        paymentTypes.add(2,paymentType3);
        paymentTypes.add(3,paymentType4);
        paymentTypes.add(4,paymentType5);

//HTML查看源

    <select name="paymentType" id="paymentType" class="form-control">                       <option  value="" >Select Payment Type</option>
       <option  value="I" >Initial</option>
        <option  value="R" >Recurring</option>
       <option  value="IR" >Intial & Recurring</option>
       <option  value="O" >Onetime</option>
      </select>

推荐答案

 //It should be 
   request.setAttribute("myPaymentType","I");

 //Not
   String myPaymentType = "I";

我还有一个问题，我们如何才能使用jstl再次验证变量?我们只需要在请求对象中有变量吗?

I still have a question, how we can validate againest a variable using jstl? Do we have to have variable in only request object?

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