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From fetch request to DOM: How to convert the response into a walkable DOM structure? [duplicate]

Is there a way to convert HTML like:
<div>
<span></span>
</div>
or any other HTML string into DOM element? (So that I could use appendChild()). I know that I can do .innerHTML and .innerText, but that is not what I want -- I literally want to be capable of converting a dynamic HTML string into a DOM element so that I could pass it in a .appendChild().
Update: There seems to be confusion. I have the HTML contents in a string, as a value of a variable in JavaScript. There is no HTML content in the document.

You can use a DOMParser, like so:
var xmlString = "<div id='foo'><a href='#'>Link</a><span></span></div>";
var doc = new DOMParser().parseFromString(xmlString, "text/xml");
console.log(doc.firstChild.innerHTML); // => <a href="#">Link...
console.log(doc.firstChild.firstChild.innerHTML); // => Link

You typically create a temporary parent element to which you can write the innerHTML, then extract the contents:
var wrapper= document.createElement('div');
wrapper.innerHTML= '<div><span></span></div>';
var div= wrapper.firstChild;
If the element whose outer-HTML you've got is a simple <div> as here, this is easy. If it might be something else that can't go just anywhere, you might have more problems. For example if it were a <li>, you'd have to have the parent wrapper be a <ul>.
But IE can't write innerHTML on elements like <tr> so if you had a <td> you'd have to wrap the whole HTML string in <table><tbody><tr>...</tr></tbody></table>, write that to innerHTML and extricate the actual <td> you wanted from a couple of levels down.

Why not use insertAdjacentHTML
for example:
// <div id="one">one</div>
var d1 = document.getElementById('one');
d1.insertAdjacentHTML('afterend', '<div id="two">two</div>');
// At this point, the new structure is:
// <div id="one">one</div><div id="two">two</div>here

Check out John Resig's pure JavaScript HTML parser.
EDIT: if you want the browser to parse the HTML for you, innerHTML is exactly what you want. From this SO question:
var tempDiv = document.createElement('div');
tempDiv.innerHTML = htmlString;

Okay, I realized the answer myself, after I had to think about other people's answers. :P
var htmlContent = ... // a response via AJAX containing HTML
var e = document.createElement('div');
e.setAttribute('style', 'display: none;');
e.innerHTML = htmlContent;
document.body.appendChild(e);
var htmlConvertedIntoDom = e.lastChild.childNodes; // the HTML converted into a DOM element :), now let's remove the
document.body.removeChild(e);

Here is a little code that is useful.
var uiHelper = function () {
var htmls = {};
var getHTML = function (url) {
/// <summary>Returns HTML in a string format</summary>
/// <param name="url" type="string">The url to the file with the HTML</param>
if (!htmls[url])
{
var xmlhttp = new XMLHttpRequest();
xmlhttp.open("GET", url, false);
xmlhttp.send();
htmls[url] = xmlhttp.responseText;
};
return htmls[url];
};
return {
getHTML: getHTML
};
}();
--Convert the HTML string into a DOM Element
String.prototype.toDomElement = function () {
var wrapper = document.createElement('div');
wrapper.innerHTML = this;
var df= document.createDocumentFragment();
return df.addChilds(wrapper.children);
};
--prototype helper
HTMLElement.prototype.addChilds = function (newChilds) {
/// <summary>Add an array of child elements</summary>
/// <param name="newChilds" type="Array">Array of HTMLElements to add to this HTMLElement</param>
/// <returns type="this" />
for (var i = 0; i < newChilds.length; i += 1) { this.appendChild(newChilds[i]); };
return this;
};
--Usage
thatHTML = uiHelper.getHTML('/Scripts/elevation/ui/add/html/add.txt').toDomElement();

Just give an id to the element and process it normally eg:
<div id="dv">
<span></span>
</div>
Now you can do like:
var div = document.getElementById('dv');
div.appendChild(......);
Or with jQuery:
$('#dv').get(0).appendChild(........);

You can do it like this:
String.prototype.toDOM=function(){
var d=document
,i
,a=d.createElement("div")
,b=d.createDocumentFragment();
a.innerHTML=this;
while(i=a.firstChild)b.appendChild(i);
return b;
};
var foo="<img src='//placekitten.com/100/100'>foo<i>bar</i>".toDOM();
document.body.appendChild(foo);

Alternatively, you can also wrap you html while it was getting converted to a string using,
JSON.stringify()
and later when you want to unwrap html from a html string, use
JSON.parse()

Cannot get the number of var using javascript

I have this certain problem where I cannot get the number value of 'currentStock' var data inside an HTML file using JavaScript. I have this on my HTML file in script tag:
By the way, due to the HTML being too large, and also it was not originally my script, but from a friend who was asking for some help on adding some features in it, I can't upload the whole script as it will be going to be too long. The whole HTML script has 14076 characters with 289 lines.
I have only studied java and not javascript with HTML, so I need help with this one.
<script>
window.onload = function() {
var goDown = document.getElementById('uniqueNav');
var goRight = document.querySelector('.clothesNav');
var goUp = document.querySelector('.shrink');
goDown.style.marginTop = "0px";
goRight.style.marginLeft = "5px";
goUp.style.height = "0px";
}
$('document').ready(function(){
var name = "Ombre Printed Shirt";
var price = "P499.00";
var initialStock = 0;
var currentStock = initialStock;
document.querySelector('#clothTitle').innerHTML = "" +name;
document.querySelector('#clothPrice').innerHTML = "Price: " +price;
document.querySelector('#PITitle').innerHTML = "" +name;
document.querySelector('#PIPrice').innerHTML = "Price: " +price;
document.querySelector('#currentStock').innerHTML = "CurrentStocks: " +currentStock;
}); //------------------------Change This Every Document ----------------------------//
</script>
then this in my JavaScript File:
var cStocks = document.getElementById('currentStock').data;
alert(typeof cStocks);
alert("Data in cStocks = " + cStocks);
if (!cStocks) {cStocks = 0; alert("cStocks, not a valid number");}
if ((cStocks <= 0) == true)
{
document.querySelector('.clothButton').style.display='none';
document.querySelector('.clothButtonDisabled').style.display='flex';
}
else
{
document.querySelector('.clothButton').style.display='flex';
document.querySelector('.clothButtonDisabled').style.display='none';
}
upon loading the page, the alert says thaat the data type is undefined. I don't know what's happening with my code. did I miss something?
By the way, I have JQuery on my HTML page. it says JQuery v3.3.1 as a version

It doesn't look to me like #currentStock will have a data attribute, or value attribute (which is for inputs), so of course the js returns undefined. Right now it looks like #currentStock is having the innerHTML set on the document.ready to Current Stocks: 0
You do have an accessible variable, currentStock, which is defined during document.ready. Why aren't you accessing it directly? It will have the numeric value in it already. All you can get from #currentStock is the html you generated on document.ready, and you'd have to parse the number out of it, when it's available in raw form in the js variable currentStock.

javascript find div id inside string and delete it's content

I have a string with some variable html saved inside, among which a div with static id="time",
example:
myString = "<div class="class">blahblah</div><div id="time">1:44</div>"
How can I create a new identical string cutting off only the time? (1:44 in this case).
I can't look for numbers or the ":" because is not safe in my situation.
What i've tried without success is this:
var content = divContainer.innerHTML;
var jHtmlObject = jQuery(content);
var editor = jQuery("<p>").append(jHtmlObject);
var myDiv = editor.find("#time");
myDiv.html() = '';
content = editor.html();
console.log('content -> '+content);

var myString = '<div class="class">blahblah</div><div id="time">1:44</div>';
//create a dummy span
//put the html in it
//find the time
//remove it's inner html
//execute end() so the jQuery object selected returns to the span
//console log the innerHTML of the span
console.log($('<span>').html(myString).find('#time').html('').end().html());
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

You can achieve this using a regular expression in plain javascript like so:
myString.replace(/(<div id="time">).*(<\/div>)/, '$1$2')
If you want to extract only the 1:44 portion you can use the following:
myString.match(/(<div id="time">)(.*)(<\/div>)/)[2]

How to extract all hyperlink titles from big html string using javascript?

I got an HTML string as :var code; I want to extract all hyper link title values in this big string and place them in textarea. I tried the following but it never works. could any one tell me what i am doing wrong?
sample hyperlinks to look for(i want to extract mango,cherry,...) :
mango
cherry
my code string has blocks of data like below:
<div class="details">
<div class="title">
mango
<span class="type">3</span>
</div>
</div>
full code:
$.getJSON('http://anyorigin.com/get?url=http://asite.com/getit.php/&callback=?', function(data){
//$('#output').html(data.contents);
var siteContents = data.contents;
//writes to textarea
document.myform.outputtext.value = siteContents ;
var start = siteContents.indexOf('<ul class="list">');
var end = siteContents.indexOf('<ul class="pag">', start);
var code = siteContents.substring(start, end);
document.myform2.outputtext2.value = code ;
var pattern = /<a href="([^"]+?)">([^<]+?)<\/a>/gi;
code = code.match(pattern);
for (i = 0; i < code.length; i++) {
document.write($2<br />'));
}
});
</script>

It looks like you're trying to parse HTML with regex. This post has some more info on that topic.
Since this question is tagged as jQuery, you could try something like the following...
Make a jQuery object out of the returned HTML:
$markup = $(data.contents);
Find the anchors:
$anchors = $markup.find('a');
Get the text (or whatever attribute you want from it):
arrText = [];
$anchors.each(function() {
arrText.push($(this).text());
});
Put result into textarea:
$textarea.val(arrText.join(','));

To achive this jquery is the simplest solution, you can try below code
$('a').each(function(){
var copiedTitle = $(this).html();
var previous = $('#test').html();
var newText = previous +"\n"+ copiedTitle;
$('#test').html(newText);
});
JS Fiddle

write GET URL variable to page using javascript

I have a form which contains a wysiwyg editor. The form data is sent to a page using a GET method in the form.
How would i decode(to keep the DIV and BR tags) in the variable and print it out on the page using Javascript?
Any help would be appreciated

The equivalent of decode would be unescape(), you should be able to something like this:
(function(){
document.$_GET = [];
var urlHalves = String(document.location).split('?');
if(urlHalves[1]){
var urlVars = urlHalves[1].split('&');
for(var i=0; i<=(urlVars.length); i++){
if(urlVars[i]){
var urlVarPair = urlVars[i].split('=');
document.$_GET[urlVarPair[0]] = urlVarPair[1];
}
}
}
})();
document.write(unescape(document.$_GET['varname']));

Maybe you should try this script: http://www.webtoolkit.info/javascript-url-decode-encode.html
It encodes decodes everything.