Develop Reference

Hwo do I display the output of a javascript function through HTML [duplicate]

This question already has answers here:
How do I change the text of a span element using JavaScript?
(18 answers)
Closed 1 year ago.
Im trying to create a calculator for a formula. This function works, I have seen in the console. I just can't figure out how to display the output.
enter image description here

Here it goes;
Like the comment said there are different way and all depends on your context and UI.
Here is quick possibility how you can take your own code forward to show html;
DOM Inner HTML property
I have just used a button to trigger the function with runs your calculation function and then updates the div that we predefined. This part could be any thing for that matter.
function add(a,b){
return a+b;
}
console.log(add(1,4));
var displayhtml = document.querySelector('div');
var trigger = document.querySelector('button');
trigger.onclick = function (){
displayhtml.innerHTML = add(1,4);
}
<div>I am div</div>
<button>chnage html</button>

change some text in src of image tag using jquery [duplicate]

This question already has answers here:
Changing the image source using jQuery
(17 answers)
Closed 4 years ago.
I want to change one letter in the src of the image tag using js or jQuery.
<img src="/media/image_i/ball.png">
<img src="/media/image_i/bat.png">
I want to change that letter i in the src to a number.
Eg.it should look like this -
<img src="/media/image_4/ball.png">
<img src="/media/image_4/bat.png">
EDIT- When i used the solutions everything was working, but it was changing the "src" of all image tags to same as first image, so the second image which is "bat.png" is getting changed to "ball.png", so same image is displaying two times.
Thank you!

You can simply get the src attribute of the images, loop it over and replace the _i with _4 using JQuery. To check the below snippet works, you need to use inspect element of the browser and check the src attribute.
$(document).ready(function(){
$('img').each(function(){
var src = $(this).attr('src');;
$(this).attr('src', src.replace('_i','_4'));
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<img src="/media/image_4/ball.png">
<img src="/media/image_4/bat.png">

You can do this job using regex.
$(document).ready(function(){
var src = $('img').attr('src');
var newsrc = src.replace(/_./g, '_4');
$('img').attr('src', newsrc);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<img src="/media/image_i/ball.png">
You can develop it further.
For more : https://stackoverflow.com/a/2912904/5792209

First, you'll need to identify the particular img element you need to modify. This can be done in a variety of ways, like giving the img in question an id or a class that is unique. If the image is the only one using the src you've specified in your question, you can use that (and that's what I'm doing in the code that follows).
After getting the proper reference to the element, use the .attr() method to get/set the current src value and the standard String.replace method to swap the values:
var current = $("img[src='/media/image_i/ball.png']");
current.attr("src", current.attr("src").replace("_i", "_4"));
If this is all you need to do, JQuery is overkill. Standard JavaScript is just as simple:
var el= document.querySelector("img[src='/media/image_i/ball.png']");
el.src = el.src.replace("_i", "_4");

Simple JS code bug [duplicate]

This question already has answers here:
What do querySelectorAll and getElementsBy* methods return?
(12 answers)
Closed 6 years ago.
why dose not it work ? !!
i want to make images fade out when it is loaded , i know that this can be done by jQuery , but i wanna know where is the bug in this code.
<img src="http://1.bp.blogspot.com/-M03SoTLlJ4k/Vfwvq2dz42I/AAAAAAAAD9I/o-xN8x6HL2Y/s1600-r/Untitled-1%2B%25281%2529.png" onload="loadimage()" id="imageid"/>
<style>
#imageid {
opacity:0;
transition:1s;
}
</style>
<script>
function loadimage(){
document.getElementsByTagName("img").style.opacity="1"
}
</script>

getElementsByTagName returns a NodeList not a single DOM node, hence you need to do getElementsByTagName('img')[0] for example to get the first img, then apply the styles on that element.
Update
select all images
if you want to select all the images and apply styling to them
function loadimage(){
var imgElements = document.getElementsByTagName('img');
for(var i=0, l=imgElements.length; i < l; i++) {
imgElements[i].style.alpha = 1;
}
}
only currently loaded image (preferred by me)
function loadimage(){
this.style.alpha = 1;
}

In javascript,
document.getElementsByTagName('img')
returns a nodelist.
If you want the first item in that nodelist, you need to write:
document.getElementsByTagName('img')[0]

How can I remove a whole 'a' tag from a div using javascript? [duplicate]

This question already has answers here:
JavaScript DOM remove element
(4 answers)
Remove element by id
(19 answers)
Closed 8 years ago.
I'm using this widget/snippet:
<div class="tbnet-gadget">
<div id="tbnet-g4">Carregando...</div><a id="tbnet-link" href="http://www.tabeladobrasileirao.net/" target="_blank" class="tbnet-link" title="Tabela do Brasileirão">Tabela do Brasileirão</a>
<script async src="http://gadgetsparablog.com/ws/tabeladobrasileirao/script?funcao=g4&campeonato=serie-a" type="text/javascript"></script>
</div>
This widget forces a link on the bottom of it (Tabela do Brasileirão). If I change the href tag, the widget won't work.
I want to still use this widget, but I'm trying to remove that link from the bottom of it.
I managed to remove the href attribute using document.getElementById("tbnet-link").removeAttribute("href");, but the text "Tabela do Brasileirão" is still showing up.
This is how it looks like on JSFiddle: http://jsfiddle.net/3nhwf6tw/
How can I remove the whole <a id="tbnet-link"...Brasileirão</a> using javascript?
Thanks.
http://jsfiddle.net/3nhwf6tw/#&togetherjs=1DF8EF6xuh

How about just using CSS instead:
#tbnet-link{
display: none !important;
}
JSFiddle
Here is the non-CSS version (which is a bit ridiculous):
You can remove this:
<a id="tbnet-link" href="http://www.tabeladobrasileirao.net/" target="_blank" class="tbnet-link" title="Tabela do Brasileirão">Tabela do Brasileirão</a>
If you add this jQuery and remove the script in your html:
$.getJSON("http://54.207.27.130/ws//tabeladobrasileirao/g4.jsonp?callback=?&campeonato=serie-a&time=None", function(k) {
$("#tbnet-g4").html(k.html.replace(/\<script.*?\<\/script\>/, ""));
});
JSFiddle no-CSS

To remove the element:
var el = document.getElementById("tbnet-link");
el.parentNode.removeChild(el);
To just clear the text:
var el = document.getElementById("tbnet-link");
el.innerHTML = ""

If you're up for jQuery, it's really easy:
$(function(){
$("#tbnet-link").remove();
});

Append to div, rather than body [duplicate]

This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Inserting an element
How to do insert After() in JavaScript without using a library?
I have this little bit of javascript in a project which adds a chat window after the body of the page, I'd like to change it so that it adds the chat window AFTER my specified div "myPublisherDiv". I think this is pretty simple, any ideas? Thanks in advance!
var div = document.createElement('div');
div.setAttribute('id', 'stream' + streams[i].streamId);
document.body.appendChild(div);

This is a bit trickier. insertBefore is simple, for inserting after a node I wrote a litte helper function:
function insertAfter(newElement, referenceElement) {
referenceElement.parentNode.insertBefore(newElement, referenceElement.nextSibling);
}
var div = document.createElement('div');
...
insertAfter(document.getElementById("myPublisherDiv"), div);
But see also https://stackoverflow.com/a/1559632/1048572

This should do it..
var div = document.createElement('div');
div.setAttribute('id', 'stream' + streams[i].streamId);
var target = document.getElementById('myPublisherDiv');
target.parentNode.insertBefore(div, target.nextSibling);
ripped from How to do insert After() in JavaScript without using a library?

Put an id to your div
<div id="myDiv">..</div>
And then append things to it with the appendChild:
document.getElementById("myDiv").appendChild(div);