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Removing a created function in JavaScript

I have written this code by using some basics. I simply wanted to remove the image that I have created by using the function Generate() by a button. I have written the following code to remove the image generated. Please help me.
Please note that I have linked my button with the function Reset1(). Can someone give me the code to do the following please.
function Generate()
{
var image=document.createElement('img');
var div=document.getElementById('flex-box-gen');
image.src="https://thecatapi.com/api/images/get?format=src&type=gif&size=small"
div.appendChild(image);
}
function Reset1()
{
document.getElementById('Generate').remove();
}

You could either assign an id to your image element and use that to remove in your second function:
function generate() {
var image=document.createElement("img");
image.id = "image-01";
...
}
function reset() {
var image = document.getElementById("image-01");
var parent = image.parentNode;
parent.removeChild(image);
}
Or if there is nothing else in your containing div element you could just empty all elements from it:
function reset() {
document.getElementById("flex-box-gen").innerHTML = "";
}

getElementById will query a DOM element, not a javascript element.
What you can do, supposing you have only one img in your flex-box-gen is:
var imgs = document.querySelectorAll('#flex-box-gen img')
if(imgs.length > 0){
imgs[0].remove();
}
With a null-check in case the image was already removed

image.setAttribute('id',"Generate");
Add this line in generate function.

Bootastrap 3.3 tooltip in list

I have a list of elements that i want to dynamically change its data-original-title. What i did was have a async function that returns that content and then displays using a tooltipp.
This is the code:
function onElementOver(el) {
var pos = el.getAttribute('data-pos');
let contentTmp = arr[pos].content;
if (!contentTmp) {
let lat = arr[pos].lat;
let lng = arr[pos].lng;
getContent(lat, lng).then(function (ctn) {
contentTmp = ctn;
el.setAttribute('data-original-title', contentTmp);
$('[data-toggle="tooltip"]').tooltip();
arr[pos].content = ctn;
});
} else {
el.setAttribute('data-original-title', contentTmp);
$('[data-toggle="tooltip"]').tooltip();
}
}
I understand how the following line works, it gets all elements of the DOM wiht the data-toggle attribute, and displays it.
$('[data-toggle="tooltip"]').tooltip();
What I need is to only display the data-toggle in the element el argument of the onElementOver function.
How can I get it to only show that specific tooltip?

I haven't tested it but i assume $(el).tooltip() will work. if el is already a jquery element then use el.tooltip()

Using class instead of id in JS to do an action

First, sorry I'm not good with javascript.
HTML:
<div id="Comment-ID">
<p class="comment-content">...</p>
</div>
The javascript: (Edit: Added the whole code)
<script type='text/javascript'>
function autoloadmore() {
var loadmoreClass = document.getElementsByClassName("loadmore")[0];
var loadmoreChild = loadmoreClass.querySelector('a')
if (loadmoreClass) {
loadmoreChild.click();
}
}
//<![CDATA[
function InsertarImagenVideo(id) {
var IDelemento = document.getElementById(id),
sustituir = IDelemento.innerHTML;
sustituir = sustituir.replace(/\[img\](.[^\]]*)\[\/img\]/ig, "<img class='img-comentarios' src='$1'\/>");
document.getElementById(id).innerHTML = sustituir;
}
//]]>
window.onload = function() {
autoloadmore();
setTimeout(function(){
InsertarImagenVideo('Comment-ID');
},3000);
};
</script>
"InsertarImagenVideo" replaces some text inside with an image. Instead of using it on "Comment-ID", I want to use it on "Comment-class".
Note: I can't edit the HTML.
I couldn't find anything when I searched, or maybe I didn't know how to look. Can someone help me with this?

You can use document.querySelector to select an element by class:
Update this line:
var IDelemento = document.getElementById(id),
to var IDelemento = document.querySelector(id),
and pass the class selector to your method InsertarImagenVideo
setTimeout(function(){
InsertarImagenVideo('.comment-content');
},3000);

I found a simple way to insert an image into the <p class="comment-content">...</p> element by grabbing the parent <div id="Comment-ID">.
I'm assuming that you need to grab the unique id to then access the inner <p> element to replace the existing text with an image. This code grabs the unique id element, then grabs the first <p> tag using .getElementsByTagName('p')[0]. One thing I did add is a proper image load script to update the <p> tag with the image once it has been loaded (maybe this removes the need for that setTimeout function you have?).
let classElement = document.getElementById("Comment-ID").getElementsByTagName('p')[0];
let imageObject = new Image();
imageObject.src = `https://www.clipartmax.com/png/full/1-14442_smiley-face-png-smiley-png.png`;
imageObject.onload = function() {
classElement.innerHTML = `<img id="myImg" src="${imageObject.src}" />`;
let imageElement = document.getElementById(`myImg`);
imageElement.width = 100;
imageElement.height = 100;
};
Here's a JSFiddle demo of the upper code in action.
Hope this helps :)

Storing variable via .text() isn't uptodate

I have <span> tags in a div that is removed when user clicks on them. Works fine.
I want to store the .text() inside that div in a variable. The problem is that the updated text doesn't get stored.
Click on a word to remove it in this jsFiddle.
As you can see, the content variable returns the old text, not the new revised one.
How can I store a variable with the updated text?
jQuery:
jQuery(document).ready(function() {
jQuery(document).on("mousedown", ".hello span", function() {
// don't add full stop at the end of sentence if it already ends with
var endChars = [".", "?", "!"];
jQuery(this).fadeOut(function(){
var parentObj = jQuery(this).parent();
jQuery(this).remove();
var text = parentObj.find("span").first().html();
parentObj.find("span").first().html(ta_capitalizeFirstLetter(text));
text = parentObj.find("span").last().html();
if ( endChars.indexOf(text.slice(-1)) == -1 )
{
parentObj.find("span").last().html(text+".");
}
});
var content = jQuery(this).parent().parent().find('.hello').text();
alert(content);
});
});

The code to get the new text should be moved inside the fadeOut callback. Once the animation is completed and element is removed, then the innerText of the parent element will be updated. At this time, the updated content should be read from the DOM.
Demo
// Cache the element
var $el = jQuery(this).parent().parent().find('.hello');
jQuery(this).fadeOut(function () {
jQuery(this).remove();
// Irrelevant code removed from here
...
var content = $el.text();
alert(content);
});
Here's another simple demo with minimal code that'll help to understand the code better.
Demo

I tried to debug your jsfiddle in chrome, and it looks like the priority of your code is like this:
declare on this event - jQuery(this).fadeOut(function(){
get the the current data of the div var content = jQuery(this).parent().parent().find('.hello').text();.
alert your data without changes.
calling the funcntion of fadeout
I think all you have to do is to call your alert and 2 from your anonymous function of fadeout

Just put your alert inside the callback:
jQuery(this).fadeOut(function(){
var parentObj = jQuery(this).parent();
jQuery(this).remove();
var text = parentObj.find("span").first().html();
parentObj.find("span").first().html(ta_capitalizeFirstLetter(text));
text = parentObj.find("span").last().html();
if ( endChars.indexOf(text.slice(-1)) == -1 ) {
parentObj.find("span").last().html(text+".");
var content = parentObj.parent().find('.hello').text();
alert(content);
}
});

Append HTML Code from Javascript

How can i change this function which is currently appending a CSS class to a div on HTML
if (!this.sortDisabled) {
var $th = $(this).addClass(table.config.cssHeader);
if (table.config.onRenderHeader) table.config.onRenderHeader.apply($th);
}
to make to append this instead of adding class "table.config.cssHeader"
'&nbsp<font face="webdings">6</font>'
So my question explained is how can i get this
if (!this.sortDisabled) {
var $th = $(this).addHTMLCODE(&nbsp<font face="webdings">6</font>);
if (table.config.onRenderHeader) table.config.onRenderHeader.apply($th);
}

It looks like you're using jQuery. You're pretty close; instead of addHTMLCODE, you need append, and you also need to quote the HTML:
var $th = $(this).append('&nbsp<font face="webdings">6</font>');