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How do I add a button to a div class on load from Javascript? [duplicate]

This question already has answers here:
How to add onload event to a div element
(26 answers)
Closed 5 years ago.
For an assignment, I cannot touch the HTML code and am editing an external JS file. I have to refer the code to an existing class and turn that into a button to run a script.
The has to be ran on load to transform an element with a given id into a button that can also run a function on click.
So let's say the we have id="bar",
how do I go about it?
My code doesn't work at all.
document.getElementById("bar").onload = function () { myFunction() };
function myFunction() {
document.getElementById("bar").innerHTML = "<button></button>";
}

Why don't you just execute your script as the DOM is ready? To do so,
document.addEventListener('DOMContentLoaded', function () {
document.getElementById("bar").innerHTML = "<button></button>";
}, false);

You just need a createElement function.
This works:
document.addEventListener("DOMContentLoaded", function(){
var button = document.createElement("button");
button.innerHTML = "This is a button";
// assuming the Div's ID is bar
var div = document.getElementById('bar');
div.appendChild(button);
//the following function will alert a window when the button is clicked
button.addEventListener ("click", function() {
alert("Button was clicked");
});
});

Updated Codepen
I think this is bit tha you needed
var bar = document.getElementById('bar');
window.onload = function() {
var barInner = bar.innerHTML;
bar.innerHTML = '<button>' + barInner + '</button>';
}
bar.onclick = function() {
alert("Hello\nHow are you?");
};

document.getElementById("bar").onload = myFunction();
function myFunction() {
document.getElementById("bar").innerHTML = "<button>Button</button>";
}
There you go!

Not every single HTML element has a load event.
Only some of them are concerned, such as the window, an image... etc
Have a look here on MDN to learn more about this.
Here is a simple snippet resolving all what you mentioned.
window.addEventListener("load", () => {
// you can put your entire script in here.
var elt = document.getElementById("bar"),
button = document.createElement("button");
button.textContent = elt.textContent;
button.onclick = callback;
elt.textContent = '';
elt.appendChild(button);
function callback() {
console.log("The button has been clicked");
}
});
<div id="bar" style="background: beige; height: 2em">Click me</div>
In the previous snippet, I am appending the button in the element. But if the matter is really to transform it into a button, there we go:
window.addEventListener("load", () => {
// you can put your entire script in here.
var elt = document.getElementById("bar"),
container = elt.parentNode,
button = document.createElement("button");
button.id = elt.id; // if you want to keep the id
button.textContent = elt.textContent;
button.onclick = callback;
container.removeChild(elt);
container.appendChild(button);
function callback() {
console.log("The button has been clicked");
}
});
<div style="background: #fee; height: 2em">
<div id="bar" style="background: beige; height: 2em">Click me</div>
</div>

How to hide dynamically created div on ready?

I have a scenario where I need to create a div dynamically, so I created on-ready of document. But it should be displayed on-selection. I am facing the issue, that on page load, the empty div is created. So I need to hide that div and should be shown on-select of text.
JavaScript
$(document).ready(function () {
closePopUp();
var replaceDiv = document.createElement('div');
replaceDiv.id = 'rplceTxtDiv';
document.getElementsByTagName('body')[0].appendChild(replaceDiv);
var innerspan = document.createElement('span');
replaceDiv.appendChild(innerspan);
innerspan.innerHTML += '˟';
var innerDiv = document.createElement('div');
replaceDiv.appendChild(innerDiv);
innerspan.addEventListener("click", closePopUp, false);
replaceDiv.addEventListener("click", getSel, false);
var rplceTxtDiv = $('#rplceTxtDiv');
$('#mytextarea').on('select', function (e) {
var txtarea = document.getElementById("mytextarea");
var start = txtarea.selectionStart;
var finish = txtarea.selectionEnd;
rplceTxtDiv.offset(getCursorXY(txtarea, start, 20)).show();
rplceTxtDiv.find('div').text('replace with stars');
}).on('input', function () {
if (interval) {
interval = false;
edits.push($(this).val());
if (edits.length > maxHistorySize) edits.shift();
setTimeout(() => interval = true, saveInterval);
}
});
document.onkeydown = undo;
});
Here is my plunker
The issue is shown in below image:

Hide the DIV before appending it to the HTML by
replaceDiv.style.display = "none";
and I recommend showing it after you have updated the text by
replaceDiv.style.display = "block";

Set a CSS class as:
.MyClass {
display: none;
}
and with jQuery:
$('#myDivIDorClass').addClass('MyClass');

just hide all div having class name "yourclass" with hide()
like this on ready
$('div.yourclass').css("display","none");

Creating two elements using js and then having access to them later in another function

I am building some js functionality where I will be creating 2 elements on a page
var createBtn = function(
var btn = document.createElement('button')
...
)
var createIframe = function(
var iframe = document.createElement('iframe')
...
)
Pretty basic stuff, but later on I want to add an event listener to the button that will apply a style attribute to the iframe.
Something like:
var displayIframe = function(
Iframe.style['display'] = 'block'
)
button.addEventListener('click', displayIframe)
My question is how can I access the elements after I have created them without going through the annoyance of attaching classes to them and accessing them all over again that way. Is there someway of getting access to them in the create functions from the beginning.

Your codes is almost correct, but some changes is needed
var btn, iframe;
var createBtn = function () {
btn = document.createElement('button');
...
}
var createIframe = function () {
iframe = document.createElement('iframe');
...
}
Callback function
var displayIframe = function(){
iframe.style['display'] = 'block'
}
Attach click listener
btn.addEventListener('click', displayIframe);
Your mistakes:
you should declare btn and iframe as global variables to be accessible to other functions
function starts with { and ends with } not (, )
so far your codes is correct, without any error, but you won't see anything on the page because you have not attached your newly created elements to the body, For accomplish this try this function
function attachToBody(){
document.body.appendChild(btn);
document.body.appendChild(iframe);
}

In your example, I dont know why you use functions to create element, but you must have your point. Try this and let me know does this work for you.
//this is equivalent to: var btn = document.createElement('button');
var btn = (function(){
var btn = document.createElement('button');
return btn;
})();
var iframe = (function{
var iframe = document.createElement('iframe');
return iframe;
})();
document.getElementById("parentId").appendChild(btn);
document.getElementById("parentId").appendChild(iframe);
btn.addEventListener('click', function(){
iframe.style.display = "none";
});

var createBtn = function() {
var btn = document.createElement('button')
btn.setAttribute("id", "myButton");
return btn;
}
var createIframe = function() {
var iframe = document.createElement('iframe')
iframe.setAttribute("id", "myFrame");
return iframe;
}
document.body.appendChild(createBtn()); // Append button to body.
document.body.appendChild(createIframe()); // Append iFrame to body.
// Get Elements by Id.
var myButton = document.getElementById("myButton");
var myFrame = document.getElementById("myFrame");
// Add event listener.
myButton.addEventListener("click", function() {
myFrame.style.display = "none", false);
}

Javascript tags to Jquery Switch statements

I made script tags that serves as the event holder when a button is click this events are triggered.The setup is like this: I have 6 buttons and I made that six times from btn1 to btn6.
<input type="button" id="btn1" value="AUS">
<script type="text/javascript">
var modal = document.getElementById('modal');
var shade = document.getElementById('shade');
document.getElementById('btn1').onclick = function() {
var src = "img2/Australia.jpg";
var img = document.getElementById("placeholderImg");
img.src = src;
img.style.display = "inline";
modal.style.display = shade.style.display = 'block';
};
document.getElementById('close2').onclick = function() {
modal.style.display = shade.style.display = 'none';
};
</script>
After I finished I noticed they are working however there are instances that they cease to function, my friend suggested to me, "what if you use a Jquery Switch statement?". Here's what I come up with but I can't make it to work if you can help me to point out my mistake. I would be very grateful.
Jquery Code:
$('.sbutton').on('click', function () {
switch (this.val()) {
case 'btn1':
var src = "img2/Australia.jpg";
var img = document.getElementById("placeholderImg");
img.src = src;
img.style.display = "inline";
modal.style.display = shade.style.display = 'block';
break;
}
});

In the event handler, this is a native DOM element.
Change
switch (this.val()) {
to
switch ($(this).val()) {
or (better)
switch (this.value) {
But you should have seen an error in the console. Please read Using the console.

Get image ids in a div every second

I was successful in getting the id of all images within a div when clicking the div with the following codes below:
<script type="text/javascript">
function getimgid(){
var elems = [].slice.call( document.getElementById("card") );
elems.forEach( function( elem ){
elem.onclick = function(){
var arr = [], imgs = [].slice.call( elem.getElementsByTagName("img") );
if(imgs.length){
imgs.forEach( function( img ){
var attrID = img.id;
arr.push(attrID);
alert(arr);
});
} else {
alert("No images found.");
}
};
});
}
</script>
The codes above works perfectly, doing an alert message of the image id when clicking card div. Now what I want is to run this function without clicking the div in every 5 seconds. I have tried setInterval (getimgid, 5000), but it doesn't work. Which part of the codes above should I modify to call the function without clicking the div. Any help would be much appreciated.
JSFiddle

You should be calling it this way:
setInterval (function(){
getimgid();
},5000);
also remove binding of click event for element.
Working Fiddle

Use elem.click() to trigger click
function getimgid() {
var elems = [].slice.call(document.getElementsByClassName("card"));
elems.forEach(function (elem) {
elem.onclick = function () {
var arr = [],
imgs = [].slice.call(elem.getElementsByTagName("img"));
if (imgs.length) {
imgs.forEach(function (img) {
var attrID = img.id;
arr.push(attrID);
alert(arr);
});
} else {
alert("No images found.");
}
};
elem.click();
});
}
setInterval(getimgid, 1000);
DEMO

Problem: You are not triggering the click in setInterval. You are only re-running the event binding every 5 secs.
Solution: Set Interval on another function which triggers the click. Or remove the click binding altogether if you don't want to manually click at all.
Updated fiddle: http://jsfiddle.net/abhitalks/3Dx4w/5/
JS:
var t;
function trigger() {
var elems = [].slice.call(document.getElementsByClassName("card"));
elems.forEach(function (elem) {
elem.onclick();
});
}
t = setInterval(trigger, 5000);