jsp tags - Selective Mandatory fields in a jsp -

jsp tags - Selective Mandatory fields in a jsp -

i have query jsp.

scenario: suppose have 2 fields

field one: connection type (selective dropdown) dropdown options: 1. gsm 2. cdma 3. others

field two: comments (free text)

question: how create mandatory user come in 'comments' free text box if 'connection type' selected 'others'

initially disable text area , when onchanging dropdown, selected value. if it's not empty, enable text box. in html

<select id="connectiontype" name="connectiontype" onchange="changetext()"> <option value="">select value</option> <option value="gsm">gsm</option> <option value="cdma">cdma</option> </select> <input type="text" id="comments" disabled="true" />

and in javascript,

function changetext() { if(document.getelementbyid("connectiontype").value !=""){ //alert(document.getelementbyid("connectiontype").value); document.getelementbyid("comments").disabled=false; }else{ document.getelementbyid("comments").disabled=true; } }

hope helps you.the demo in fiddle here

jsp jsp-tags