[SOLVED] Extracting filename without extension from variable string.

frankenscarf · #1 Jan 11th, 2008, 15:20

Hi everybody. Here's the deal:

Page Loads, script checks URL string and finds the file name minus ".html" (or whatever the last 5 characters are) then grabs an image from the img folder that has the same name and tosses it into the page. If the file name isn't one of the four listed, a default image is loaded instead.

JavaScript Code:
<div align="left"><font color="#993300">

HTML: Select all

function pickImg() {
zeString=top.document.URL;
zeSlasher=zeString.lastIndexOf("/",zeString.length-1);
zePage=zeString.substring(zeSlasher+1,zeString.length-5);
alert(zePage)
if (zePage=="control", "efficiency", "savings", "solutions") {
document.write("<img src='img/"+zePage+".jpg' alt='My Alt Text' />");
} else {
document.write("<img src='img/total.jpg' alt='My Alt Text' />");
}
}

The above works fine as long as the URL string ends with ".html"
but I have a feeling if the URL ended up being "...contact.html?blahblahblah" my little script would be script-out-of-luck.

How can I make sure I'm always getting the filename minus the extension and any possible passed variables.

Examples are greatly appreciated since I know less than nothing about javascript. Thank you in advance.

Rakuli · #2 Jan 11th, 2008, 16:09

Okay, try this.

Code: Select all

function pickImg() {
zeString=top.document.URL;
// First, get rid of the query string after the ?

zeString = zeString.split('?')[0];

//now we'll get the url only after remobing what comes after the last '.'

zePage= zeString.substring(zeString.lastIndexOf('/'), zeString.lastIndexOf('.'));


alert(zePage)
if (zePage=="control", "efficiency", "savings", "solutions") {
document.write("<img src='img/"+zePage+".jpg' alt='My Alt Text' />");
} else {
document.write("<img src='img/total.jpg' alt='My Alt Text' />");
}
}

Bascially doing what you were doing but checking for the last period as well..

hope that helps

frankenscarf · #3 Jan 11th, 2008, 16:36

Rakuli, thank you very much for your help. I've found another solution for this particular problem, but your advice will come in handy in the future.

FYI, the solution I'm using now:

HTML: Select all

var file = location.href.substring(location.href.lastIndexOf('/')+1);
    var fileName =file.split('.');
    alert(fileName[0]);

...then I run through my comparative if/else statement.

Thanks again.

Rakuli · #4 Jan 11th, 2008, 16:54

Cool glad you sorted it.. You have to watch out though becuase if there is more than one period in the url then it will fail with your method.

My method will take away only the extensions.

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[SOLVED] Extracting filename without extension from variable string.