We Keep Coding

How to replace a html tag in js?

I have a string in which there are continous occurances of a font tag
<font color="blue">DATA ENTRY</font>
and in some cases like this
<font class="beat">DATA ENTRY</font>
I want to replace the 2 tags with
So that it looks like this
<p>DATA ENTRY</p>
I tried this ,can anyone please suggest me help.Thanks.
text = text.replace('<font [^"]*>',<p>).replace('</font>','');

block.outerHTML = "<p>" + block.innerHTML + "</p>"
where block is any HTML block
it just left to select it correctly with:
var block = document.querySelector(".selector");

If you want to stick with your simple string manipulation, you need to use regular expressions and correct the replacements in your replace calls:
text = text.replace(/<font[^>]*>/g,'<p>').replace(/<\/font>/g,'</p>');

Since you just need to replace the string you can do this with just one replace statement.
text = text.replace(/<(\/*)font[^>]*>/g, '<$1p>');

If you using jQuery with replaceWith
$('font').replaceWith('<p>DATA ENTRY</p>');

First of all the font tag is deprecated and should not be used.
Get an array of the tags you want to replace.
var elems = document.getElementsByTagName('font');
Go through loop and replace old HTML with new HTML
for (var i = 0; i < elems.length; i++)
{
var target = elems[i].innerHTML;
elems[i].innerHTML = target.replace(/(<p)/igm, '<font').replace(/<\/p>/igm, '</font>');
}
Note: This is not tested but should work.

Try like this :
$('font').contents().unwrap().wrap('<p/>');
In javascript, you can do something like this :
var str="<font>hello world</font>";
str = str.replace(/<font>/, "<p>");
str = str.replace(/<\/font>/,"</p>");

Unable to display background image using javascript on qualtrics

For starters, I have absolute no knowledge with javascript. I am trying to display a background image extracted from a url address on just a page of the questionnaire on qualtrics with the following codes:-
Qualtrics.SurveyEngine.addOnload(function()
{
<div id="divtest">Hello</div>
<img id="imgtest" />
<img id="imgreal" src="http://webneel.com/wallpaper/sites/default/files/images/01-2014/2-flower-wallpaper.jpg" />
var string = 'http://webneel.com/wallpaper/sites/default/files/images/01-2014/2-flower-wallpaper.jpg';
document.getElementById("divtest").style.backgroundImage = "url('" + string + "')";
document.getElementById("imgtest").src = string;
});
But I got the following error message:-
Invalid JavaScript! You cannot save until you fix all errors: Unexpected token <
How do I go about fixing this?

You cannot add HTML directly in javascript code, you have to create into body section of your page, or if you need to create elements via code you have to use createElement
var _div = document.createElement('div');
_div.id = 'divtest';
_div.innerHTML = 'Hello';
_div.style.backgroundImage = "url('" + string + "')";
document.getElementsByTagName('body')[0].appendChild(_div); // to place as child of body
or
document.getElementById('[ID of parent element]').appendChild(_div); // to place as child of other element.

add javascript variable in image url

My Random Number Generate code is
var randomnumber=Math.floor(Math.random()*99999)
Now I want to put this variable output in a image scr url..
Here is my url
<img src="http://www.myexample.com/get/image.php?vcid=14851&t=481" alt="" id="imge"/>
So what will my code?
<img src="http://www.myexample.com/get/image.php?vcid='+ randomnumber +'&t=481" alt="" id="imge"/>
??
Please help me

In pure Javascript you could do it like
var randomNumber = 1;
var image = document.getElementById("imageId");
var imageSrc = image.getAttribute("src");
image.setAttribute("src", imageSrc + randomNumber);
To put your number at the correct place you could use some string split functions, but since the order of query strings don't matter you should just put your vcid query at the end.

Try adding this in your <script>:
document.getElementById("imge").src = "http://www.myexample.com/get/image.php?vcid=" + randomnumber + "&t=481";

I'd personally suggest:
var img = document.getElementById('imge');
img.src = img.src.replace(/vcid=(\d+)/, function(){
return randomnumber=Math.floor(Math.random()*99999);
});
// purely to see the src has been changed, this is *not* relevant or required
img.title = img.src;
<img src="http://www.myexample.com/get/image.php?vcid=14851&t=481" alt="" id="imge"/>
References:
JavaScript Regular Expressions.
String.replace().

Escape characters in String in a HTML page?

I have a string in the below non-escaped format in a HTML page:
<a href="http://somesite/product?page=blahk&id=EA393216&tabs=7,0&selections=quarter:Q2+2013^&wicket:pageMapName=wicket-2\">SomeThing</a>
What I need is to use jQuery/JavaScript to replace that string with just the link "SomeThing".
I have looked at some examples in StackOverflow, but they don't seem to work. I'm just getting started with jQuery and JavaScript, so would appreciate any help here.
Any ideas?

Try html() and text() in jquery to decode:
var str = '<a href="http://somesite/product?page=blahk&id=EA393216&tabs=7,0&selections=quarter:Q2+2013^&wicket:pageMapName=wicket-2\">SomeThing</a>';
var decoded = $('<div />').html(str).text();
alert($(decoded).text());
See Fiddle demo

var str = '<a href="http://somesite/product?page=blahk&id=EA393216&tabs=7,0&selections=quarter:Q2+2013^&wicket:pageMapName=wicket-2\">SomeThing</a>';
var helper = document.createElement('p');
// evaluate as HTML once, text now "<a href..."
helper.innerHtml = str;
// evaluate as HTML again, helper now has child element a
helper.innerHtml = helper.innerText;
// get text content only ("SomeThing")
alert(helper.innerText);

Here is a possible starting point.
Hope this gets you started!
function parseString(){
var str = '<a href="http://somesite/product?page=blahk&id=EA393216&tabs=7,0&selections=quarter:Q2+2013^&wicket:pageMapName=wicket-2\">SomeThing</a>';
var begin = str.indexOf('\">',0)+2; //--determine where the opening anchor tag ends
var end = str.indexOf('</a>',0); //--determine where the closing anchor tag begins
var parsedString = str.substring(begin,end); //--grab whats in between;
/*//--or all inline
var parsedString = str.substring(str.indexOf('\">',0)+2,str.indexOf('</a>',0));
*/
console.log(parsedString);
}
parseStr();

Get source of image

I have a next string like:
<img src="../uplolad/commission/ranks/avatar.jpg' . $row[$c_name] .'" width="50" height="50"/>
How can i get a image file name in javascript? I know only PHP regexes. Extention of a file can be different.
The result must be: avatar.jpg

Regex is not ideal for this. JavaScript can traverse the HTML as distinct objects more readily than as a long string. If you can identify the picture by anything, say by adding an ID to it, or an ID to a parent with that as the only image, you'll be able to access the image from script:
var myImage = document.getElementById('imgAvatar'); // or whatever means of access
var src = myImage.src; // will contain the full path
if(src.indexOf('/') >= 0) {
src = src.substring(src.lastIndexOf('/')+1);
}
alert(src);
And if you want to edit, you can do that just as well
myImage.src = src.replace('.jpg', '.gif');

Fetch it following coding which can help what you want to get.
<script type="text/javascript">
function getImageName(imagePath) {
var objImage = new RegExp(/([^\/\\]+)$/);
var getImgName = objImage.exec(imagePath);
if (getImgName == null) {
return null;
}
else {
return getImgName[0];
}
}
</script>
<script>
var mystring = getImageName("http://www.mypapge.mm/myimage.png")
alert(mystring)
</script>

Here's a shorter variation of David Hedlund's answer that does use regex:
var myImage = document.getElementById('imgAvatar'); // or whatever means of access
alert(myImage.src.replace( /^.+\// , '' ));