Question

125

using javascript variable inside jstl

rated 0 times [ 129] [ 4] / answers: 1 / hits: 61476 / 14 Years ago, thu, july 22, 2010, 12:00:00

I want to iterate a HashMap in javascript using jstl. is it possible to do like this?

function checkSelection(group,tvalue){

alert(group);

alert(tvalue);



<c:forEach items=${configuredGroupMap} var=groupMap>

    alert(aa<c:out value=${groupMap.key}/>);

    <c:if test=${groupMap.key==group}>

        alert(t<c:out value=${groupMap.key}/>);

        <c:if test=${groupMap.value==tvalue}>

            alert(equal);

        </c:if>

    </c:if>

</c:forEach>

}

it's not going inside after

 <c:if test=${groupMap.key==group}>

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

pierre

Add To Favorites

Follow

Total Points: 716

Total Questions: 128

Total Answers: 102

Location: Djibouti

Member since Sun, Feb 27, 2022

2 Years ago

pierre questions

1 npm error : cb() never called, what should I do?

Fri, Nov 6, 20, 00:00, 4 Years ago

1 How to make a mute command in Discord.js

Fri, Sep 4, 20, 00:00, 4 Years ago

1 React error - expected semicolon after render method?

Thu, Jul 18, 19, 00:00, 5 Years ago

1 Return constructor of generic type in TypeScript

Sun, Dec 2, 18, 00:00, 6 Years ago

1 How to use new Feature Hooks in React?

Fri, Oct 26, 18, 00:00, 6 Years ago

View All

answered 14 Years ago bobbie · Accepted Answer

to iterate a HashMap in javascript using jstl - Not possible

JSTL is executed in server side by your servlet container for which Javascript is just a text which would be skipped whereas JavaScript is executed in client side where JSTL is unknown. After the server completes processing JSTL, the generated HTML(if any) from the JSTL along with other JavaScript/HTML will be rendered.

For example, if you have this,

<c:forEach var=myItem items=${myCollection}>

alert('<c:out value=${myItem.id}>')

<c:if test=${myItem.id == 0}> 

   alert(zero); 

</c:if>

</c:forEach>

If the ids of the beans in the collection are 0, 1, 2, the server renders the following to the client side by executing the above code,

alert('0')

alert('zero')

alert('1')

alert('2')

Now the browser will give you 4 alerts on loading the page (what if you have 10000 items, you will render 10000 alert statements to the browser). So the point is that you haven't iterated Java collection in JavaScript, you have simply generated a serious of Javascript statements in server iterating the collection using JSTL and you have provided those Javascript statements along with other html contents to browser.