js html select dropdown value depends on input value
Question
I wanna create select drop down list where selected value will be depends on input value. Example: If i write 0 in <input type='text' name='answer' id="ans" oninput="myFunction();"> than will be selected dynamically value NO.
<select id="abcd">
<option value="1">OK</option>
<option value="0">NO</option>
</select>
My attempts
function myFunction() {
var x = document.getElementById('ocena7');
if (x == 0)
{
document.getElementById("abcd").selectedIndex = 2;
}}
Greetings
3 answers
solution1
0 2018-10-18 21:06:45
The problem is that with var x = document.getElementById('ans'); you get the DOM element not the value of it.
You need to replace that with: var x = document.getElementById('ans').value;
solution2
0 2018-10-18 21:07:00
Just look at this answer: https://stackoverflow.com/a/1085810/826211
And for your code:
You want to use
var x = document.getElementById('ocena7').value;
if you want the value of the element. Now you're just getting a reference to the element with
var x = document.getElementById('ocena7');
solution3
0 2018-10-18 21:17:04
This may help
<!DOCTYPE html>
<html>
<head>
<script>
function myFunction() {
var x = document.getElementById('ans').value;
if (x == 0)
{
document.getElementById("abcd").options[1].selected = 'selected'
}
}
</script>
</head>
<body>
<select id="abcd">
<option value="1" >OK</option>
<option value="0" >NO</option>
</select>
<input type='text' name='answer' id="ans" oninput="myFunction();">
</body>
</html>
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.