CODEWITHSUNDEEP
javajspservlets
user3075386
user3075386

Reputation: 31

How to set list box value on jsp from servlet

Here. i have created list box on my jsp file and i got the selected value in my servlet by using getParameter. now i want to set the value of listbox in the same jsp file which i have previously selected when i reload the same jsp file from servlet.

jsp file

<tr><td>Operation:<select name="state" >
            <option value="1">Addition</option>
            <option value="2">Subtraction</option>
            <option value="3">Multiplication</option>
            <option value="4">Division</option>
                  </select></td></tr>

servlet file

operation=req.getParameter("state");
    n3=Integer.parseInt(operation);

Upvotes: 0

Views: 2372

Answers (1)

user2575725
user2575725

Reputation:

You need to use the select tag attribute selected:

<select name="state">
    <option value="1" ${'1' eq param.state ? 'selected' : ''}>Addition</option>
    <option value="2" ${'2' eq param.state ? 'selected' : ''}>Subtraction</option>
    <option value="3" ${'3' eq param.state ? 'selected' : ''}>Multiplication</option>
    <option value="4" ${'4' eq param.state ? 'selected' : ''}>Division</option>
</select>

Note: make sure you are redirecting to the jsp using RequestDispatcher.forward(request, response)

${} is Expression Language(EL) provided in jsp. In EL, ${param.state} is equivalent to request.getParameter("state")

eq is logical operator in EL, you can even use == for the same.

To use with request attributes, you may try:

<option value="1" ${'1' eq requestScope.data ? 'selected' : ''}>Addition</option>

Upvotes: 1

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