JavaScript: How can i set a variable in a string

Question

I would like to set attributes on all elements that id starts with "id-" followed by a number [e.g. id="id-0", id="id-1) and so on]. I thought about something like this:

<script type="text/javascript" >

function Prepare() {
    var = 0
    while(document.getElementById("id-{var}")) {
        document.getElementById("id-{var}").setAttribute("rows", "60");
        var += 1
    }

</script>

How can i set a var like this in JavaScript?

if (document.getElementById("id-"+variable)){ /** do stuff */}; — Dennis Rongo
– Dennis Rongo, Commented Feb 6, 2013 at 21:44

ierdna · Accepted Answer · 2013-02-06 21:50:22Z

3

this should accomplish the task:

<script type="text/javascript" >

function Prepare() {
    var ct = 0
    while(document.getElementById("id-"+ct)) {
        document.getElementById("id-"+ct).setAttribute("rows", "60");
        ct += 1
    }

</script>

alternatively:

<script type="text/javascript" >
function Prepare() {
    for(var ct = 0;document.getElementById("id-"+ct);ct++) {
       document.getElementById("id-"+ct).setAttribute("rows", "60");
     }
</script>

edited Feb 6, 2013 at 21:50

answered Feb 6, 2013 at 21:44

ierdna

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4 Comments

ierdna Over a year ago

ct += 1 is equivalent to ct = ct + 1 or ct++

T.J. Crowder Over a year ago

@ user: Gosh, really?!?!?!

Shawn31313 Over a year ago

@T.J.Crowder You learn something new everyday. Haha, but yeah. Its quite handy

T.J. Crowder Over a year ago

@Shawn31313: My comment might have been sarcastic. ;-)

Chase · Accepted Answer · 2013-02-06 21:55:09Z

0

Depending on compatability you could use querySelectorAll():

function Prepare(){
    var els = document.querySelectorAll("[id^=id]");

    for(var i=0; i<els.length; i++){
        els[i].setAttribute("rows", 60);
    }
}

EXAMPLE

answered Feb 6, 2013 at 21:55

Chase

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