Develop Reference

javascript parse text from <a href> links

Lets say I have
ThisTextChanges
ThisTextChanges
ThisTextChanges
ThisTextChanges
I want to iterate through these and get the "ThisTextChanges" which are some numbers that changes, most accurately timers.
How can i achieve that? jquery is fine.
They are inside a div with id "main_container".
I need to put the text in a var so the href is importanto to know which var i use for each one.

Lets break the task down into several steps:
Get a handle to all of our links (document.querySelectorAll)
learn how to get the current text of an a tag (childNode[0].nodeValue)
put it all together (Array.from, Array.map)
Get a handle to all of our links:
we will use document.querySelectorAll to get list of all nodes that match our selector. here I'm just going to use the selector a, but you probably have a class that specifies these links vs other links on the page:
var links = document.querySelectorAll('a');
Get the text of a link
This one is a bit more complicated. There are several ways to do this, but one of the more efficient ways is to loop through the child nodes (which will mostly be text nodes), and append the node.nodeValue for each one. We could probably get away with just using the nodeValue of the first child, but instead we'll build a function to loop through and append each.
function getText(link){
var text = "";
for (var i = 0; i < link.childNodes.length; i++){
var n = link.childNodes[i];
if (n && n.nodeValue){
text += n.nodeValue;
}
}
return text;
}
Put it all together
To put it all together we will use Array.map to turn each link in our list into the text inside it. This will leave us with an array of strings. However in order to be able to pass it to Array.map we will have to have an array, and document.querySelectorAll returns a NodeList instead. So to convert it over we will use Array.from to turn our NodeList into an array.
function getText(link){
var text = "";
for (var i = 0; i < link.childNodes.length; i++){
var n = link.childNodes[i];
if (n && n.nodeValue){
text += n.nodeValue;
}
}
return text;
}
var linkTexts = Array.from(document.querySelectorAll('a'))
.map(getText);
console.log(linkTexts);
this is text
this is some more text

You can just add condition in the a selector as follows:
var array = [];
$('#main_container a[href="/example2"]').each(function(){
array.push($(this).html());
});
console.log(array);

You can iterate and store them in an Array
var arr = [];
$("a").each(function(){
arr.push($(this).text());
console.log( arr );
});

you can achieve that in may ways. this example using for loop.
var main_container = document.getElementById("main_container");
var items = main_container.getElementsByTagName("a");
for (var i = 0; i < items.length; ++i) {
// do something.....
}

var array = [];
$('#main_container a').each(function(){
array.push($(this).html());
});
console.log(array);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="main_container">
ThisTextChanges 1
ThisTextChanges 2
ThisTextChanges 3
ThisTextChanges 4
</div>

Please try:
$('#main_container > a[href]').each(function() {
var tes = $(this).attr('href').substring(1);
window[tes] = $(this).text();
});
123 will produce var named example1 with value 123, and so on.

find div in html with javascript and regex

I try to select html element with javascript without! jQuery...
for example my html is:
<div id="my1231">
</div>
and i want to select any first div with id started with my, and i try so:
var regex = /my(.*)/;
var templateCode = document.match(regex)
alert(templateCode);
but nothing happend, what i do wrong?
how to select div with regex, where first part of id is static, and second random?

How about document.querySelectorAll?
document.querySelectorAll("[id^='my']")
Just be aware of the >= IE8 support
http://caniuse.com/#search=querySelectorAll

If you really want to use regex to match against ids, you must first get a node list and then loop through it and check each id individually. You can then append each matching element to a new array:
var divs = document.getElementsByTagName('div');
var regex = /my(.*)/, matches = [];
for(i=0; i< divs.length; i++){
if(regex.test(divs[i].id)){
matches.push(divs[i]);
}
}
JSFiddle

Of course you can always mix both answers and use feature detection to determine which method to use:
var divs;
var matches = [];
var re = /^my\w+/;
if (document.querySelectorAll) {
matches = document.querySelectorAll("[id^='my']");
} else if (document.getElementsByTagName) {
divs = document.getElementsByTagName('div');
for(i=0, iLen=divs.length; i<iLen; i++){
if (re.test(divs[i].id)) {
matches.push(divs[i]);
}
}
}
HTH.

Replace string of text javascript

Im trying to replace a string of text for another string of text here is my code plus js fiddle
HTML
<div class="label">Rating:</div>
<div class="data rating">****</div>
Javascript
var str=document.getElementsByClassName("data" ,"raiting").innerHTML;
var n=str.replace(/\*/g,"star");
document.getElementsByClassName("data", "raiting").innerHTML=n;
Demo
http://jsfiddle.net/sgGQz/1/

document.getElementsByClassName() method returns, as its name suggests, a collection (HTMLCollection) of elements, not a single one -even if there's just a single element with the given classname(s) in DOM.
You need to go through each of them in order to make such a replacement. For example:
var elements = document.getElementsByClassName("data rating");
for (var i = 0, l = elements.length; i < l; i++) {
elements[i].innerHTML = elements[i].innerHTML.replace(/\*/g, 'star');
}
JSFiddle.
Alternatively, if you know for sure that there should be only a single element, you can assign it directly:
var elementToAdjust = document.getElementsByClassName("data rating")[0];
// ...

If you only have one occurrence of the element this will work:
var str=document.getElementsByClassName("data rating")[0].innerHTML;
var n=str.replace(/\*/g,"star");
document.getElementsByClassName("data rating")[0].innerHTML=n;
If multiple data rating elements exist use:
var elems =document.getElementsByClassName("data rating");
for(var i = 0; i < elems.length; i++){
elems[i].innerHTML = elems[i].innerHTML.replace(/\*/g,"star");
}
Both method correct some flaws in the original code.
First, rating was misspelled in the argument passed to getElementsByClassName. Second, getElementsByClassName() uses class names delimited by spaces to select elements with multiple classes, instead of multiple arguments. Get elementsByClassName returns an array of elements which must be iterated through.
JS Fiddle: http://jsfiddle.net/sgGQz/5/

You need to check again for getElementsByClassName,It returns node-List, so you can do like this and You can loop through then after each element and set your value
var str=document.getElementsByClassName("data" ,"raiting")[0].innerHTML;
var n=str.replace(/\*/g,"star");
document.getElementsByClassName("data", "raiting")[0].innerHTML=n;
Here is the example as you have only one occurance

Replacing all urls in a div

I am trying to write javascript code to find all the urls inside a div. Now this would be pretty easy if all the urls within the div were separated by spaces in which case I can just do a regex on what's inside the div to find them. However, the urls within this outer div may be in sub divs (or any other html tag) and I want to consider the subdivs as separators as well (and I don't want to get rid of these subdivs). To give an example, in the following I want to find www.foo.com and www.bar.com within the div with id "outer":
<div id="outer"><div>www.foo.com</div>www.bar.com</div>
What would be a good way of doing this?

You can apply a recursive call to all non-text child nodes.
function replaceWwwInNodes(node) {
//text node
if (node.nodeType === 3) {
node.textContent = node.textContent.replace(/* ??? */)
}
else {
Array.prototype.forEach.call(node.childNodes, function (elem) {
replaceWwwInNodes(elem);
});
}
}
replaceWwwInNodes(document.getElementById('outer'));
http://jsfiddle.net/UDX5V/

Try to use this sample http://jsfiddle.net/iklementiev/TaCx9/1/
var data = document.getElementById("outer").innerText;
var myRe = /www\.[0-9a-z-]+\.[a-z]{2,4}/igm;
var matches= data.match(myRe)
for (var i = 0; i < matches.length; i++) {
alert('match: ' + matches[i]);
}
this help to find all urls.

try this
var expression = /[-a-zA-Z0-9#:%_\+.~#?&//=]{2,256}\.[a-z]{2,4}\b(\/[-a-zA-Z0-9#:%_\+.~#?&//=]*)?/gi;
var regex = new RegExp(expression);
var regContent = $("#outer").html();
var newContent = regContent;
if(regContent.match(regex))
{
var textContent = regContent.match(regex);
for(var i=0;i<regContent.match(regex).length;i++)
{
newContent = newContent.replace(new RegExp(regContent.match(regex)[i], "g"), "test");
}
$("#outer").html(newContent);
}
this will get all url content and replace it as "test".

Javascript regex to replace text div and < >

var text='<div id="main"><div class="replace">< **My Text** ></div><div>Test</div></div>'
I want to replace div with class="replace" and html entities < > comes inside that div with some other text.
I.e the output :
'<div id="main"> Hello **My Text** Hello <div>Test</div> </div>'
I've tried
var div = new RegExp('<[//]{0,1}(div|DIV)[^><]*>', 'g');
text = text.replace(div, "Hello");
but this will replace all div.
Any help gratefully received!

If a Jquery solution is acceptable:
text = $(text) // Convert HTML string to Jquery object
.wrap("<div />") // Wrap in a container element to make...
.parent() // the whole element searchable
.find("div.replace") // Find <div class="replace" />
.each(function() // Iterate over each div.replace
{
$(this)
.replaceWith($(this).html() // Replace div with content
.replace("<", "<sometext>")
.replace(">", "</sometext>")); // Replace text
})
.end().html(); // return html of $(text)
This sets text to:
<div id="main"><sometext> My Text </sometext><div>Test</div></div>
And to replace it back again:
text = text.replace('<sometext>', '<div class="replace"><')
.replace('</sometext>', '></div>');
http://api.jquery.com/jquery/#jQuery2
http://api.jquery.com/each/
http://api.jquery.com/find/
http://api.jquery.com/html/

In pure JS it will be something like this:
var elements = document.getElementsByClassName('replace');
var replaceTag = document.createElement('replacetext');
for (var i = elements.length - 1; i >= 0; i--) {
var e = elements[i];
e.parentNode.replaceChild(replaceTag, e);
};​

Here is one crazy regex which matches what you want:
var text='<div id="main"><div class="replace">< **My Text** ></div><div>Test</div></div>'
var r = /(<(div|DIV)\s+class\s*?=('|")\s*?replace('|")\s*?>)(\s*?<)(.*?)(>\s*?)(<\/(div|DIV)\s*?>)/g;
The whole replacement can be made with:
text.replace(r, function () {
return 'Hello' + arguments[6] + 'Hello';
});
Please let me know if there are issues with the solution :).
Btw: I'm totally against regexes like the one in the answer...If you have made it with that complex regex there's probably better way to handle the problem...

Consider using the DOM instead; you already have the structure you want, so swap out the node itself (borrowing heavily from #maxwell's code, but moving children around as well):
var elements = document.getElementsByClassName('replace');
for(var i = elements.length-1; i>= 0; --i) {
var element = elements[i];
var newElement = document.createElement('replacetext');
var children = element.childNodes;
for(var ch = 0; ch < children.length; ++i) {
var child = children[ch];
element.removeChild(child);
newElement.appendChild(child);
}
element.parentNode.insertBefore(newElement,element);
element.parentNode.removeChild(element);
}
For each element of the given class, then, it will move each of its children over to the new element before using that element's position to insert the new element and finally removing itself.
My only questionmark is whether the modification of items in the array return by getElementByClassName will cause problems; it might need an extra check to see if the element is valid before processing it, or you may prefer to write this as a recursive function and process the tree from deepest node first.
It may seem like more work, but this should be faster (no re-parsing of the html after you've changed it, element moves are just reference value assignments) and much more robust. Attempting to parsing HTML may damage your health.
Rereading the question (always a good plan), you begin with the text in a string. If that is truly the start point (i.e. you're not just pulling that out of an innerHTML value), then to use the above just create a temporary parent element:
var fosterer = document.createElement('div');
fosterer.innerHTML = text; // your variable from the question
And then proceed using fosterer.getElementsByClassName.