I have the following filepath
var imagepath="C:\Documents and Settings\Mahesh\Desktop\images\advts.png"
how can I replace \ with \ so so that it prints
var imagepath="C:\\Documents and Settings\\Mahesh\\Desktop\\images\\advts.png"
5 Answers
You need to use the replace() method whilst escaping the \ character on each occurrence:
imagepath = imagepath.replace(/\\/g, "\\\\");
//-> "C:\\Documents and Settings\\Mahesh\\Desktop\\images\\advts.png"
If imagepath is defined with single backslash characters, those will be evaluated into an escape sequence along with the character(s) following them. At this point it's too late to replace the backslashes as they are removed from the resulting string.
4 Comments
mahesh
Thanks for the reply ,why are you using four \\\\ over here
Andy E
@mahesh: In JS string and regex literal grammar, \ is an escape character. As such, it needs to be escaped itself. Each literal \ you require in a string or regex needs another \ before it.
mahesh
Code mentioned here does not insert \\ instead it replaces \ with empty like C:Documents and SettingsMaheshDesktopimagesadvts.png
Andy E
@mahesh: re-read the last part of my answer and/or reko_t's answer. It isn't this code that's removing those slashes, they aren't in the string to begin with. If your file path is defined like it is in your question, each
` needs an extra ` in front of it, like in the second example of your question - C:\\Documents and Settings\\....It's a string literal.. By the time it's assigned to imagepath, the escape sequences are already parsed and processed, and the backslashes no longer exist in the string. You just have to have them in the string in the first place.
To demonstrate what I mean:
>>> var imagepath="C:\Documents and Settings\Mahesh\Desktop\images\advts.png"
>>> imagepath
"C:Documents and SettingsMaheshDesktopimagesadvts.png"
There's no way to fix the issue at that stage.
Comments
You can use the string replace() method. Replace on W3Schools.com.
Example:
var imagepath="C:\Documents and Settings\Mahesh\Desktop\images\advts.png"
document.write(imagepath.replace("\\", "\\\\"));
Upate As reko_t said, once a path is assigned to imagepath, it's a processed literal. The \ characters disappears. I've just tested my code with this example and there's no way to fix it unfortunately.
<html>
<head>
<script type="text/javascript">
function init() {
var imagepath="C:\Documents and Settings\Mahesh\Desktop\images\advts.png"
alert(imagepath.replace(/\\/g, "\\\\"));
}
</script>
</head>
<body onload="init()">
</body>
</html>
The only way to do it, is to replace \ to \\ on server side, and assign it to imagepath before it gets rendered to javascript that needs to be used by javascript.
2 Comments
Andy E
If it did work, it would only replace the first backslash. For global replaces you need to use a regular expression.
Buhake Sindi
@Andy E, thanks, my updated post uses regular expression to show that either my first or second solution won't work....
Try this :
str.replace(new RegExp('/', 'g'),'-')
1 Comment
JJJ
They want to replace
\ with \\ , not / with -.Just add after var imagepath initialisation
var imagepath=imagepath.replace("\", "\\");
return imagepath;
1 Comment
Bharat Bhushan
have you give it a try by yourself before posting here ?
String.replaceAll(). Source: link