We Keep Coding

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()

Javascript for loop running out of sequence

I have a confusing problem where a line of code in my function is running before a loop which is stated above it. In my HTML I have:
<textarea id="textBox"></textarea>
<button id="submitButton" onclick="parseData()">submit</button>
<div id="put"></div>
And my JS function is:
function parseData() {
var data = $("#textBox").val();
var tab = /\t/;
data = data.split(tab);
$("#put").html($("#put").html() + "<table>");
for (var i = 0; i < data.length; i++) {
$("#put").html($("#put").html() + "<tr>"+data[i]+"</tr>");
};
$("#put").html($("#put").html() + "</table>");
return;
};
The resulting html in $("#put") is this:
<table></table>
"SiO2 (%)Al2O3 (%)TiO2 (%)CaO2 (%)MgO2 (%) 8.21.25.31.51.8 45.32.52.60.210.5 65.23.48.70.0662.3 20.11.85.42.540.2 18.91.12.34.810.7"
I'm not sure why the final </table> is being placed before the for loop runs, and I'm not sure why the <tr> tags aren't being added within the for loop. Any pointers?

jQuery automatically closes up tags upon insertion. Try this.
function parseData() {
var data = $("#textBox").val();
var tab = /\t/;
var put_html = $("#put").html() + "<table>";
data = data.split(tab);
for (var i = 0; i < data.length; i++) {
put_html += "<tr>"+data[i]+"</tr>";
};
put_html += '</table>';
$("#put").html(put_html);
return;
};
However, I notice that you aren't using <td> elements. You might want to look into fixing that too.

Every time you are adding content into the html() property rather than building the entire content and adding it.
Since you are using jQuery you can bind the event using jQuery rather than adding that directly in the HTML
<textarea id="textBox"></textarea>
<button id="submitButton">submit</button>
<div id="put"></div>
$(function(){
$("#submitButton").click(function(){
parseData();
});
function parseData() {
var data = $("#textBox").val();
var tab = /\t/;
data = data.split(tab);
// Build your html
$("#put").html('htmlstructure');
return;
}
});
Also you can look for something similar like concatenating the string in an array so that you don't create string isntances each time when you append, since strings are immutable.
Good example

get file parameters in javascript call

I'm trying to create a script that will make it easier for users to use a custom button and I have something like
<script src="http://host.com/file.js?id=12345"></script>
What I wonder is how can I, in the file.js get that id parameter.
if I use document, it will get the original html page that has the script line and what I need is that id.
is there any way i can get that id successfully? What should be the scope?
added
the idea is that I can have several buttons in the page for example to have a small and simply list:
<ul>
<li><script src="http://host.com/file.js?id=12345"></script></li>
<li><script src="http://host.com/file.js?id=23456"></script></li>
<li><script src="http://host.com/file.js?id=34567"></script></li>
</ul>
this will ultimately translate to
<ul>
<li><a class="view40btn" href="#" data-id="12345"><strong>V40</strong> Watch the video</a></li>
<li><a class="view40btn" href="#" data-id="23456"><strong>V40</strong> Watch the video</a></li>
<li><a class="view40btn" href="#" data-id="34567"><strong>V40</strong> Watch the video</a></li>
</ul>
the list above will look like this in HTML:
My only issue is that I can't assign the correct id to the data-id attribute as this is generated in the file.js.
result
from Paulpro answer I got it working with his idea and knowing that the client will have much more scripts loaded and several with id's I changed it a bit for the final and working version:
var id = (function(){
var scripts = document.getElementsByTagName('script');
for(var i = 0, result = {}; i < scripts.length; i++)
if(scripts[i].hasAttribute('data-viewfileid'))
result['id'] = decodeURIComponent(scripts[i].getAttribute('data-viewfileid'));
return result['id'];
})();
var html = '<a class="view40btn" href="#" data-id="' + id + '"><strong>V40</strong> Watch the video</a>';
document.write(html);
the script for the user would only be:
<script data-viewfileid="4444" src="file.js" type="text/javascript"></script>

You can get the last script element on the page (which will always be the currently executing one):
var scripts = document.getElementsByTagName('script');
var s = scripts[scripts.length - 1];
Then modify one of the query string parsers from this question to work with that scripts src property:
var url = s.src;
var qs = url.substring(url.indexOf('?') + 1).split('&');
for(var i = 0, result = {}; i < qs.length; i++){
qs[i] = qs[i].split('=');
result[qs[i][0]] = decodeURIComponent(qs[i][2]);
}
That will give you an object containing all the query string properties on the current script. You can just access the properties like:
result['id']; // '12345'
In summary
To get the id parameter from within file.js, add the following code to the top of file.js:
var id = (function(){
var scripts = document.getElementsByTagName('script');
var s = scripts[scripts.length - 1];
var qs = s.src.substring(s.src.indexOf('?') + 1).split('&');
for(var i = 0, result = {}; i < qs.length; i++){
qs[i] = qs[i].split('=');
result[qs[i][0]] = decodeURIComponent(qs[i][3]);
}
return result['id'];
})();
Make sure it is not in any callback functions like a DOMReady callback.
Edit: You can probably reduce your script to:
var scripts = document.getElementsByTagName('script');
var id = scripts[scripts.length - 1].getAttribute('data-viewfileid');
var html = '<a class="view40btn" href="#" data-id="' + id + '"><strong>V40</strong> Watch the video</a>';
document.write(html);

JavaScript doesn't know anything about the script tag that loaded it. However, there are a few workarounds.
If the file is being preprocessed on the server, you could make the server render the value in the response:
(function() {
var id = <%= params.id %>;
//other stuff here
}());
Or you could give the script tag an id, and make your code find it and pull out the URL.
HTML:
<script src="http://host.com/file.js?id=12345" id="myscript"></script>
JS:
var id = document.getElementById('myscript').split('id=')[1];
Or in modern browsers you could perhaps do something like this to find script tags that match where you know the script is.
var scriptTag = document.querySelector('script[src^="http://host.com/file.js"]');
var id = scriptTag.src.split('id=')[1];

One more solution is to parse .js files with php interpreter. For example in apache configuration:
AddType application/x-httpd-php .js
And in JS:
alert('<?=$_GET["id"]?>');

You can put an ID on anything, including a script tag. So you can do something like this:
HTML:
<script id="myScript" src="http://host.com/file.js?id=12345"></script>
JS:
document.getElementById('myScript').src.split('=')[1]; to get the ID from that particular example string.
If that query string represents a timestamp (in which case you need the latest version) you can modify the JavaScript code to fetch the latest <script> tag like so:
var scripts = document.getElementsByTag('script');
var latestScriptId = scripts[scripts.length-1].src.split('=')[1];
EDIT: In the context of your new edit, you would then take latestScriptId and assign it to the data.id attribute corresponding to the button you would like to create...though again, semantically, it would just make more sense to use HTML's given id attribute, and additionally, since you are not using the href property for the anchor <a> tag, you're better off using a <button> element. So something like this would suffice:
var myButton = document.createElement('button');
myButton.className += 'view40btn';
myButton.id = latestScriptId;

According to your clarifications, what you asking how to do is not what you want to do.
Instead, include one script, and have multiple placeholder nodes.
HTML:
<ul>
<li class="mybutton" data-id="12345"></li>
<li class="mybutton" data-id="23456"></li>
<li class="mybutton" data-id="34567"></li>
</ul>
<script src="myscript.js"></script>
JS:
// myscript.js
var buttons = document.getElementsByClassName('mybutton');
for (var i = 0; i < buttons.length; i++) {
var button = buttons[i];
button.innerHTML = "my button html template here with id: "+ button.dataset.id;
}
See it work here: http://jsfiddle.net/zAdnB/

Javascript code does not "realise", that it is a part of some file. JS file is not "executable", there is no main method, which should be run after loading the file. You can not pass GET parameters to it - it is not clear how they should be interpreted.
In your HTML page, you should listen to "onload" method and then call the function from your file with your parameter.

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.

Running a function by typing in URL - Javascript [duplicate]

This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
Running a function by typing in URL
On my website I have several functions that when a hyperlink is clicked on example.php page, the main content changes accordingly. Now I want to direct people from a single URL to that example.php page with the function already called. Example - www.example.com/example.php?AC ( which will call a function named AC and the content changes before the page loads)
I had already asked the same question, but forgot to tag javascript and tagged php.
Thanks in advanced.

You can use JavaScript to get the querystring, and call the functions accordingly.
How to get querystring in JavaScript: JavaScript query string

What I would do is read the query string by using something like this to figure out if the key is there
function doesKeyExist(key) {
if (default_==null) default_="";
key = key.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
var regex = new RegExp("[\\?&]"+key+"=([^&#]*)");
var qs = regex.exec(window.location.href);
return qs != null;
}
Then
if(doesKeyExist(AC)) {
// run my code
}

You could do:
var query = document.location.search;
var func = window[query];
if (func && typeof(func) == "function")
func();

<script language="javascript">
var k = document.location.toString().split('?');
if(k.length > 1)
{
if(k[1] == "AC")
AC();
}
</script>

You can add a window.onload handler, check the query string of the page and act accordingly.
For example:
<html>
<body>
<script>
function handleOnload()
{
if(location.search == "?AC")
alert("the query string is " + location.search);
}
window.onload=handleOnload;
</script>
</body>
</html>

You run a JS funciton like this.
<script type="text/javascript">
function test()
{
alert('test');
}
</script>
Now if you type javascript:test() in the url it will execute test function.