The following code exhibits various examples related to getting/putting of values from input/select fields using JavaScript.
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Working Javascript & jQuery Demo


<select id="Ultra" onchange="run()"> <!--Call run() function--> <option value="0">Select</option> <option value="8">text1</option> <option value="5">text2</option> <option value="4">text3</option> </select><br><br> TextBox1<br> <input type="text" id="srt" placeholder="get value on option select"><br> TextBox2<br> <input type="text" id="rtt" placeholder="Write Something !" onkeyup="up()">
The following script is getting the value of the selected option and putting it in text box 1
<script> function run() { document.getElementById("srt").value = document.getElementById("Ultra").value; } </script>
The following script is getting a value from a text box 2 and alerting with its value
<script> function up() { //if (document.getElementById("srt").value != "") { var dop = document.getElementById("srt").value; //} alert(dop); } </script>
The following script is calling a function from a function
<script> function up() { var dop = document.getElementById("srt").value; pop(dop); // Calling function pop } function pop(val) { alert(val); }? </script>