calling javascript function from onchange
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calling javascript function from <select> onchange
I am trying to call a javascript function from the onchange attribute of the select tag ! My issue is that I am passing the name attribute of the select to the function which always go null.
select
<body>
<form action="" method="post">
<select name="slct" id="name" onchange="rohan('measurement_conversion', '<?php echo isset($_POST["slct"])?$_POST["slct"]:"null" ?>')">
<option value="yes" selected="selected"> yes </option>
<option value="nopes"> nopes </option>
<option value="may be"> May be </option>
<option value="dont know"> dont know </option>
</select>
</form>
<div id="abc">
</div>
</body>
And here my javascript function
<script>
function rohan(var1, var2)
document.getElementById("abc").innerHTML=var1 + " " + var2;
</script>
It always prints null..
Any help will be appreciated !
3 Answers
3
HTML:
<body>
<form action="" method="post">
<select name="slct" id="name" onchange="rohan(this.value)">
<option>Select</option>
<option value="yes" selected="selected"> yes </option>
<option value="nopes"> nopes </option>
<option value="may be"> May be </option>
<option value="dont know"> dont know </option>
</select>
</form>
</body>
JS:
<script>
function rohan(value)
//you can get the value from arguments itself
alert(value);
</script>
PHP is run on the server before JavaScript is ever run in the browser. It doesn't get re-evaluated when the user changes the selected item.
Code that reacts to user changes needs to either (a) be written in JavaScript, not PHP... or (b) use AJAX.
– Amber
Sep 22 '12 at 7:56
No put in tag HTML attribute javascript, onchange is better in the script:
onchange
<script>
var b=document.getElementById('name');
b.onchange=function ()
var a=document.getElementById('name').value;
console.log(a);
</script>
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So what will be the solution ?
– Saaram
Sep 22 '12 at 7:56