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JS & jQuery script inside iframe function as if from parent html

The below code is in a script which has been loaded into the iframe #contframe source html. The button is inside the iframe.
Why does this only work when I reference the function as if it is coming from the parent HTML?
For example, the below code works:
$(document).ready(function() {
var kuf = $('#contframe').contents().find('#zbtn');
kuf.click(function() {
alert("hello");
});
});
However the below function does not work at all:
$(document).ready(function() {
$('#zbtn').click(function() {
alert("oi");
});
});

I was completely appending my scripts; I believe using the doc.createElement fixed the issue.
The following solved my issue - some slight edits from Andriy F. https://stackoverflow.com/a/13344966/10824788
//CREATES NEW JS & CSS TAGS RESPECTIVELY
function insertScript(doc, target, src, callback) {
var insertjs = doc.createElement("script");
insertjs.type = "text/javascript";
insertjs.src = src;
target.appendChild(insertjs);
}
function insertCss(doc, target, href, callback) {
var insertcss = doc.createElement("link");
insertcss.type = "text/css";
insertcss.rel = "stylesheet";
insertcss.href = href;
target.appendChild(insertcss);
}
//ADDS ABOVE TO IFRAME
$('#contframe').on('load', function(){
var context = this.contentDocument;
var frameHead = context.getElementsByTagName('head').item(0);
insertScript(context, frameHead, '/scripts/jquery.min.js');
insertScript(context, frameHead, '/scripts/content.js');
insertCss(context, frameHead, '/scripts/content.css');
});

jQuery/JS Resize of iframe not working

I try to resize an iframe with jQuery and JS. First I get the iframe out of a list of iframes and resize it when the iframe-content is ready.
NOTE: The two-steps resize is necessary because otherwise after the
content of the iframe-page is a huge space.
Problem: In the while-loop I check if the content of the iframe is ready, when not I set a timeout of 1 second. But jQuery don’t check if the content ready it always goes inside the if and try to resize the iframe but fails because jQuery cannot get the size of a NULL element.
Has someone of you a solution for my problem?
My Code:
$(document).ready(function () {
var iframes = $(".my-iframe");
$.each(iframes, function () {
resizeIframe(this);
});
});
function resizeIframe(iframe) {
$(iframe).width("100%");
var iframeIsReady = false;
do
{
if ($(iframe).ready)
{
var iframeHeight = iframe.contentDocument.body.scrollHeight;
$(iframe).height(iframeHeight);
var iframeContentHeight = $(iframe).children("#DivInPage").height();
$(iframe).height(iframeContentHeight);
iframeIsReady = true;
}
else
{
setTimeout(resizeIframe(iframe), 1000);
}
}while(!iframeIsReady);
}
Edit:
Check out my solution

Hi there is small change in your code please check following.
$(document).ready(function () {
var iframes = $(".my-iframe")[0]; // $(".my-iframe"); /Edited
$.each(iframes, function () {
resizeIframe(this);
});
});
function resizeIframe(iframe) {
$(iframe).width("100%");
var iframeIsReady = false;
do
{
if ($(iframe.contentDocument).ready) // added 'iframe.contentDocument' instead of iframe
{
var iframeHeight = iframe.contentDocument.body.scrollHeight;
$(iframe).height(iframeHeight);
var iframeContentHeight = $(iframe).children("#DivInPage").height();
$(iframe).height(iframeContentHeight);
iframeIsReady = true;
}
else
{
setTimeout(resizeIframe(iframe), 1000);
}
}while(!iframeIsReady);
}
try this.
I checked code again found that $(".my-iframe") returns array of element object.
We need object here not array.
So i hard coded 0th index. you can use id instead of this.

Solution of my problem is:
$(document).ready(function () {
var iframes = $(".my-iframe");
$.each(iframes, function () {
resizeIframe(this);
});
});
function resizeIframe(iframe) {
$(iframe).width("100%");
setInterval(function () {
//Check if the Content inside the iframe is ready
if ($(iframe.contentDocument.body).ready) {
var iframeHeight = iframe.contentDocument.body.scrollHeight;
$(iframe).height(iframeHeight);
var iframeContentHeight = $(iframe).children("#DivInPage").height();
$(iframe).height(iframeContentHeight);
//Close the Function
return;
}
}, 1000);
}

processing.js change script source

I need to find a way where I can dynamically change the source of a processing script inside an HTML document.
This is the embedded script which works fine:
<script type='application/processing' src='sketch.txt' id="applet">
</script>
Now I try to change the source:
$('#applet').attr('src', 'sketch2.txt');
alert($('#applet').attr('src'));
The alert shows that the source was changed to 'sketch2.txt' but the applet still remains the same. I think I need to refresh the script in some way.
Thank you in advance for any help!

I believe you have to manually attach each proc to the canvas, instead of just changing the the source file. This worked here:
function first_call(processing) {
processing.size(300,300);
processing.background(100);
var called = false;
processing.draw = function() {
if (!called) { processing.println("called #1"); called = true; }
}
}
function second_call(processing) {
processing.size(400,400);
processing.background(200);
var called = false;
processing.draw = function() {
if (!called) { processing.println("called #2"); called = true; }
}
}
var canvas = document.getElementById('canvas1');
var processingInstance = new Processing(canvas, first_call);
var processingInstance = new Processing(canvas, second_call);

Adding onclick to div element yields "Result of expression 'document.getElementById('elem1')"[null]

is not an object" in the safari browser. The entire code is
function addLinks () {
var p0 = document.getElementById('Pic0').onclick = addLinkAction;
}
function addLinkAction () {
var el = document.getElementById('vid0');
el.style.display = "block";
el.play();
}
The functions work fine but safari continues to throw errors when the page is rendered and and on each click of the link. I'm only testing this in safari as it's a HTML5 - iPad/iPhone only media. thanks

Try this:
function addLinks () {
var p0 = document.getElementById('Pic0').onclick = function () {
var el = document.getElementById('vid0');
el.style.display = "block";
el.play();
};
}

Make sure the element exists. When you invoke addLinks do it on DOM ready or window.onload = function(){}. Alternatively, put the script before the end body tag.

assuming you call function addLinks() on document load/ready, try to add return false as last statement of this inner function
function addLinks () {
var p0 = document.getElementById('Pic0');
p0.onclick = function() {
addLinkAction();
return false;
}
}

Updating page HTML causes endless loop

I'm writing a Firefox extension. The extension replaces certain words on the page with other words. Here's the basic code I'm using:
function startup() {
gBrowser.addEventListener("load", pageLoad, true);
}
function pageLoad(event) {
if (event.originalTarget instanceof HTMLDocument) {
var ht = content.document.body.innerHTML;
ht = ht.replace(/\bthe\b/g,"el");
content.document.body.innerHTML = ht;
}
}
The problem is that this code is causing an endless loop. When I set the innerHTML property of the body, it sends another load event, which causes the endless loop.
How can I modify the page when it loads without causing the page load event to fire again?

You could use the following code to check if it has already been run before.
var loaded = false;
function pageLoad(event) {
if (!loaded) {
if (event.originalTarget instanceof HTMLDocument) {
var ht = content.document.body.innerHTML;
ht = ht.replace(/\bthe\b/g,"el");
content.document.body.innerHTML = ht;
}
loaded = true;
}
}
Alternatively, if you wanted to keep the loaded variable out of global scope, you could use a closure:
var pageLoad = (function () {
var loaded = false;
return function(event) {
if (!loaded) {
if (event.originalTarget instanceof HTMLDocument) {
var ht = content.document.body.innerHTML;
ht = ht.replace(/\bthe\b/g,"el");
content.document.body.innerHTML = ht;
}
loaded = true;
}
}
}();
The outer function gets executed immediately and returns the inner function which will have visibility of the loaded variable due to closure.

Would having a div or span tag immediately inside of your body tag be an option? Then you could just update the innerHTML of that element, and not the entire body...