Javascript - Replace html using innerHTML - javascript

I'm trying to replace html using innerHTML javascript.
From:
aaaaaa/cat/bbbbbb
To:
Helloworld
This's my code
<html>
<head>
</head>
<body>
<p id="element1">aaaaaa/cat/bbbbbb</p>
<script language="javascript">
var strMessage1 = document.getElementById("element1") ;
strMessage1.innerHTML = strMessage1.innerHTML.replace( /aaaaaa./g,'<a href=\"http://www.google.com/') ;
strMessage1.innerHTML = strMessage1.innerHTML.replace( /.bbbbbb/g,'/world\">Helloworld</a>') ;
</script>
</body>
</html>
When i run this code it disappears Helloworld hyperlink.
what I'm doing wrong. Please help.
Thank you for all your help.

You should chain the replace() together instead of assigning the result and replacing again.
var strMessage1 = document.getElementById("element1") ;
strMessage1.innerHTML = strMessage1.innerHTML
.replace(/aaaaaa./g,'<a href=\"http://www.google.com/')
.replace(/.bbbbbb/g,'/world\">Helloworld</a>');
See DEMO.

You are replacing the starting tag and then putting that back in innerHTML, so the code will be invalid. Make all the replacements before you put the code back in the element:
var html = strMessage1.innerHTML;
html = html.replace( /aaaaaa./g,'<a href=\"http://www.google.com/');
html = html.replace( /.bbbbbb/g,'/world\">Helloworld</a>');
strMessage1.innerHTML = html;

Related

How to display string length in javascript

I am new to javascript, and today i was trying my first example as shown below in the code section. I am using an editor called "Free Javascript Editor".
when I run the code, the browser starts and the text between the tags is displayed but the length of the string is never shown.
am I using it wrong?? please let me know how to do it correctly
lib
compile 'io.reactivex.rxjava2:rxjava:2.0.1'
compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
code:
<html>
<head>
<title>Title of the home pahe</title>
</head>
<body>
<script>
var str = new string ("MyString");
str.length;
</script>
<h2>My First JavaScript</h2>
</body>
</html>
Use Onload event and put it inside js function.
<body onload="myFunction()">
<script>
function myFunction() {
var str = ("MyString");
var n = str.length;
document.getElementById("printlength").innerHTML = n;
}
</script>
<h2>My First JavaScript</h2>
<p id="printlength"></p>
</body>
Use document.createElement
var str = "MyString";
var p = document.createElement("p");
p.textContent = str.length;
document.body.appendChild(p);
Scripts are not rendered by the browser, only executed. You can, however, do something like this:
<html>
<head>
<title>Title of the home pahe</title>
</head>
<body>
<h2>My First JavaScript</h2>
<p id="theLength"></p>
<script>
// No need to invoke the string constructor here.
var str = 'MyString';
// Find our placeholder element and set the textContent property.
document.getElementById('theLength').textContent = str.length;
</script>
</body>
</html>
It's good practice to put your script tags at the end of the body element - that way all of the HTML should render before the scripts are executed.
You should assign the length of your string to a variable. Then, you can show it.
<span id="stringLength"></span>
<script>
var str = "MyString";
var length = str.length;
document.getElementById('stringLength').textContent = 'Length: ' + length; // Show length in page
console.log('Length: ' + length); // Show length in console
alert('Length: ' + length); // Show length as alert
</script>
It must be String, not string. Code below works.
var str = new String ("MyString");
str.length;
Changed your code to this:
<html>
<head>
<title>Title of the home pahe</title>
</head>
<body>
<script>
var str = "MyString";
console.log(str.length);
</script>
<h2>My First JavaScript</h2>
</body>
</html>
Then you must look in the developer console for the output, here is how:
Google Chrome
FireFox
Safari

onkeyup event in textarea

I have a very basic input/output structure in HTML:
<textarea id="input" onkeyup="sendCode()">
Hello World!
</textarea>
<div id="output"></div>
And I have JS function that should pass everything from input to output:
var input = document.getElementById("input");
var output = document.getElementById("output");
function sendCode(){
output.innerHTML = input.innerHTML;
}
The sendCode() function works when I call it manually, but it seems that onkeyup event not firing in this textarea.
Here is jsfiddle: http://jsfiddle.net/mudroljub/y5a2n8ab/
Any help?
UPDATE: jsfiddle is updated and working now.
Use value since it's not a content text but a value property
var input = document.getElementById("input");
var output = document.getElementById("output");
function sendCode(){
output.innerHTML = input.value;
}
And a working demo here
I would first like to point out that this will not run because the code runs before the HTML exists, so first off, put these lines inside a function:
window.onload= function anyname() {
var input = document.getElementById("input");
var output = document.getElementById("output");
}
Secondly, try using either:
editor.onkeyup = "sendCode()"
in your script area or at the top of the new function i created:
editor.addEventListener(keyup,sendCode,false)
Basically when a key goes up in that area it calls the sendCode() function. The false is if you don't want to use capture which I think is default anyway but just to be safe.
Basically java script is not that dynamic.So a better option is to
use jQuery.
[Note:- "jquery-2.2.2.min.js" given in src, in script tag,
is Jquery Library file codes can be copied from following link :http://code.jquery.com/jquery-2.2.2.min.js]
Just copy the contents from above link,into a textfile , save it by the name "jquery-2.2.2.min.js"
or any other name as you wish.The src of script should contain the same.
The "jquery-2.2.2.min.js" should be in the same directory where
you have the html file. Otherwise full path to be mentioned.
Here is the answer to your question.
<html>
<head>
<title>Dynamic TextArea</title>
<script type="text/javascript" src="jquery-2.2.2.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("textarea").keyup(function(){
sendCode();
});
});
function sendCode(){
document.getElementById("output").innerHTML =
document.getElementById("input").value;
}
</script>
</head>
<body>
<form>
<textarea id="input">
Hello World!
</textarea>
</form>
<span id="output"></span>
</body>
</html>
If you have any doubts please ask.
I am sure once you learn to use jQuery you would forget javascript.
Where do you define the sendCode() function? It might not exist at the point where you create your text area.
This snippet should work:
<textarea id="editor">
Hello World!
</textarea>
<div id="output"></div>
<script type="text/javascript">
var editor = document.getElementById("editor");
var output = document.getElementById("output");
function sendCode(){
output.innerHTML = editor.value;
}
editor.addEventListener('keyup',sendCode);
</script>

How to remove <script> tags from an HTML page using C#?

<html>
<head>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
if (window.self === window.top) { $.getScript("Wing.js"); }
</script>
</head>
</html>
Is there a way in C# to modify the above HTML file and convert it into this format:
<html>
<head>
</head>
</html>
Basically my goal is to remove all the JavaScript from the HTML page. I don't know what is be the best way to modify the HTML files. I want to do it programmatically as there are hundreds of files which need to be modified.
It can be done using regex:
Regex rRemScript = new Regex(#"<script[^>]*>[\s\S]*?</script>");
output = rRemScript.Replace(input, "");
May be worth a look: HTML Agility Pack
Edit: specific working code
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
string sampleHtml =
"<html>" +
"<head>" +
"<script type=\"text/javascript\" src=\"jquery.js\"></script>" +
"<script type=\"text/javascript\">" +
"if (window.self === window.top) { $.getScript(\"Wing.js\"); }" +
"</script>" +
"</head>" +
"</html>";
MemoryStream ms = new MemoryStream(Encoding.ASCII.GetBytes(sampleHtml));
doc.Load(ms);
List<HtmlNode> nodes = new List<HtmlNode>(doc.DocumentNode.Descendants("head"));
int childNodeCount = nodes[0].ChildNodes.Count;
for (int i = 0; i < childNodeCount; i++)
nodes[0].ChildNodes.Remove(0);
Console.WriteLine(doc.DocumentNode.OuterHtml);
I think as others have said, HtmlAgility pack is the best route. I've used this to scrape and remove loads of hard to corner cases. However, if a simple regex is your goal, then maybe you could try <script(.+?)*</script>. This will remove nasty nested javascript as well as normal stuff, i.e the type referred to in the link (Regular Expression for Extracting Script Tags):
<html>
<head>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
if (window.self === window.top) { $.getScript("Wing.js"); }
</script>
<script> // nested horror
var s = "<script></script>";
</script>
</head>
</html>
usage:
Regex regxScriptRemoval = new Regex(#"<script(.+?)*</script>");
var newHtml = regxScriptRemoval.Replace(oldHtml, "");
return newHtml; // etc etc
This may seem like a strange solution.
If you don't want to use any third party library to do it and don't need to actually remove the script code, just kind of disable it, you could do this:
html = Regex.Replace(html , #"<script[^>]*>", "<!--");
html = Regex.Replace(html , #"<\/script>", "-->");
This creates an HTML comment out of script tags.
using regex:
string result = Regex.Replace(
input,
#"</?(?i:script|embed|object|frameset|frame|iframe|meta|link|style)(.|\n|\s)*?>",
string.Empty,
RegexOptions.Singleline | RegexOptions.IgnoreCase
);

Issues with my JS?

I wrote a little script to generate a random yes or no. However, it is not running. At all. What is wrong with my code?
Here is a JSFiddle: http://jsfiddle.net/u8ukp/
My code:
HTML:
<!DOCTYPE html>
<html>
<head>
<title>Should You? | A completely random decision</title>
<script type="text/javascript">
function func(){
var i = Math.random();
if (i >= 0.5) {
var e = document.getElementById('result');
e.InnerHTML = "Yes! :)";
}else{
var e = document.getElementById('result');
e.InnerHTML = "Nope! :("
};
};
</script>
</head>
<body>
<header>Should You?</header>
<br><br>
<a onclick="func();">Should You?</a>
<br><br>
<span id="result"></span>
</body>
</html>
Thanks!
innerHTML, not InnerHTML -- Javascript is case-sensitive.
Here's a working JSBin
It is a number of things actually. First innerHTML and not InnerHTML.
Second, not use <span> but <div>, and last, at the fiddle 'onLoad' was selected, making it impossible to debug.

stuck with javascript-html output

I am kind of stuck in weird problem. i cant find the problem with the following code
<html>
<head>
<script type="text/javascript">
// Import GET Vars
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];
}
}
}
var tag_tag=document.$_GET['tags'];
alert(tag_tag);
document.getElementById("resultElem4").innerHTML=tag_tag;
</script>
</head>
<body>
<p id='resultElem4'></p>
</body>
</html>
its showing the string in alert but not in html when i call it like result.php?tags=cat
Put your script tag at the bottom (right before the closing body tag). The issue is that the element resultElem4 hasn't loaded when you try to reference it using getElementById.
You just move the < script > to the end of the body.
<body><p></p><script>....</script></body>

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