javascript check whether a specific element (iframe) exist, if not, appendchild - Stack Overflow

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i want to achieve some feature like this:

var el = document.createElement("iframe");
el.setAttribute('id', 'ifrm');
document.body.appendChild(el);
el.setAttribute('src', '');

and if "ifrm" exists, jt won't create new iframe. if it doesn't exist, it will create that frame. i want to do this to avoid duplicate frame creation when user keeps click on the same button to generate frame. is there a way to check whether a specific iframe exists? thanks

i want to achieve some feature like this:

var el = document.createElement("iframe");
el.setAttribute('id', 'ifrm');
document.body.appendChild(el);
el.setAttribute('src', 'http://www.example.');

and if "ifrm" exists, jt won't create new iframe. if it doesn't exist, it will create that frame. i want to do this to avoid duplicate frame creation when user keeps click on the same button to generate frame. is there a way to check whether a specific iframe exists? thanks

• javascript

Share Improve this question Follow edited Jun 12, 2012 at 7:21 Tomalak 339k6868 gold badges546546 silver badges635635 bronze badges asked Jun 12, 2012 at 7:19 MarioMario 88544 gold badges1919 silver badges3030 bronze badges 2

• document.getElementById() – Tomalak Commented Jun 12, 2012 at 7:21
• a better solution would be to remove the button entirely, or unbind the click event from the button and disable it when you click on it – Andy Ray Commented Jun 12, 2012 at 7:49

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2 Answers 2

Sorted by: Reset to default 2

You can check with getElementById('ifrm') whether or not the frame with that id already exists. If not, create it. Like so:

if(!document.getElementById("ifrm")) 
   // Create the damn thing

If you wish to check if there is any iframe at all, you could use getElementsByTagName('iframe').

To make live a little easier, you can take a look at jQuery. This is a Javascript library that helps you to create DOM objects and/or find them in the DOM tree.

if(document.getElementById("ifrm"))
   //then it exists
else
   //it doesn't exist yet

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