php获取document.getelementbyid的值

Question

    <select style="width: 300px" id='Jproduk' name='selectJP' onchange="cekInput()">
        <option  value="" selected></option>
        <option  value="1">game</option>
        <option  value="2">itunes</option>
        <option  value="3">google</option>   </select>   
<script type="text/javascript">   
<?php $jprod= document.getElementById('Jproduk').value;?>   
</script>

How can I get the value of selected option and parsing it into $jprod ?

Answer 1

You can not assign javascript variable value directly to PHP variable like this, if you want to do so; you can get pass value of javascript variable to PHP code by using AJAX call.

Try following code snippet

<select style="width: 300px" id='Jproduk' name='selectJP' onchange="cekInput()">
    <option  value="" selected></option>
    <option  value="1">game</option>
    <option  value="2">itunes</option>
    <option  value="3">google</option>   
</select>   

<script type="text/javascript">
function cekInput() {
    var selectJP = document. getElementById('Jproduk').value;
    // value of selected option
    alert(selectJP);

    // To pass this value in php you can do AJAX stuff here    
}
</script>

Answer 2

Please try below code. This is correct solution.

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
 <select style="width: 300px" id='Jproduk' name='selectJP' onchange="cekInput()">
        <option  value="" selected></option>
        <option  value="1">game</option>
        <option  value="2">itunes</option>
        <option  value="3">google</option>   </select>   

<script>

function cekInput(){
     $jprod= document.getElementById('Jproduk').value;
     alert($jprod);
}
</script>

Answer 3

In case $jprod= document.getElementById('Jproduk').value; not working then your input element does not have this id="Jproduk"