CODEWITHSUNDEEP
javascriptfunctionsetintervalrepeat
behzad n
behzad n

Reputation: 249

Repeat Javascript Function For Each Value

i hava two question : 1 - for function with input value how i can set interval i test this but now working 

<script>
function bn(x)
{
alert (x);
}
setInterval("bn(x)",3000);
</script>
<a href="#" onclick="bn(1);">bn 1</a><br>

with setInterval("bn()",3000); work but show 'undefine' insteadof '1'

an 2- how Set repeat for two value mean when repeat this function i try for new value and function repeat for two value 

<script>
function bn(x)
{
alert (x);
}
setInterval("bn(x)",3000);
</script>
<a href="#" onclick="bn(1);">bn 1</a><br>
<a href="#" onclick="bn(2);">bn 2</a>

Upvotes: 0

Views: 450

Answers (2)

Matt Wonlaw
Matt Wonlaw

Reputation: 12443

<script>
function bn(x) {
  alert(x);
}
setInterval(function() { bn(1) }, 3000)
</script>

will call bn every 3 seconds and pass it the value 1

The reason you were getting undefined before is because you were trying to pass x which (in the code you posted) has never been declared.

The parameters you pass to a function don't have to have the same name as the function arguments..

<script>
var some_var = 1;
function bn(x) {
   alert(x);
}
setInterval(function() { bn(some_var) }, 3000);
</script>

Will do the same thing as the previous example but you'll be able to change some_var elsewhere in your script and have that updated value passed into bn.

Upvotes: 0

Daedalus
Daedalus

Reputation: 7722

Okay, I think I understand what you want; see below:

For your first question, what you are currently doing will obviously not work(as you've likely figured out). To fix that, you must use an anonymous function; example below:

<script>
var x = 1;

function bn(x)
{
    alert (x);
}
setInterval(function() {
    bn(x);
},3000);

</script>

<a href="#" onclick="x = 1;">bn 1</a><br>
<a href="#" onclick="x = 2;">bn 2</a>

As to your second question, see the last two lines above; as the function is already running all you need to control is the value of x, and make sure you set its scope as general, as opposed to specific to the function in which it is used.

The onclick events set the value of x. I've made sure the code works; if the value is set to 2, then the alert will display 2, etc.

Upvotes: 4

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