funky substring

@kbrown2974Dec 11.2003

extracting data from a text box using substring

example string = ‘f /’

test = substring(2,1) is giving me ‘ /’

…why is it giving me 2 characters when it specifies only 1 character??

to post a comment

@MichaelMDec 11.2003 — #Can you post the script as you have it? Based on what you've shown us, I can't see why you'd be getting bad results from the substring method.

@David_HarrisonDec 11.2003 — #You are using the substring method incorrectly. It should be used like this:

var str='f /';

test=str.substring(1,2);

This will assign the variable test a value of " ". For substring you specify two numbers, the first is where it should start taking characters from (remembering that the numbering of char's starts from 0), and the second is the number of the character after where you want it to stop. So if (for some reason) you wanted all the string you would do this:

test=str.substring(0,str.length);

or, in this case:

test=str.substring(0,3);

@kbrown2974authorDec 11.2003 — #thanks..i'm used to the substring(1,2) being start pos 1, 2 char..not start 1, end 2

@David_HarrisonDec 11.2003 — #Happy to help. ?

I think that is what it's like in VBScript but I can't be sure.

@oleragDec 11.2003 — #Yep - the difference between "substr" and "substring"

functions. You can see in this example that "substr"

works similar to Oracle's pl/sql language while the

"substring" is like Java's language.

If you cut/paste the example below and input... oh "abcdef"

as the string you'll see the different strings. Javascript also

attempts to fix things in "substring" if your second argument

is < the first argument by, I believe switching the values,

which is probably what your example is doing (changing the

(2,1) to (1,2) thereby getting your "space and slash").

In your example if your replaced "substring" with "substr"

you'd get what your looking for or you can add one to the

first argument's value and place this amount in the second

argument using "substring) to only see the slash.

[code=php]
 <html>
 <head>
 <script type="text/javascript">
 function showText() {
 var objValue = document.forms[0].myText.value;
 alert("JavaScript Substringn " +
 "Substring: " + objValue.substring(3,4) + "n" +
 "Substr:  " + objValue.substr(3,4));
 }
 </script>
 </head>
 <body>
 <center>
 <b>Title</b>
 <form>
 <input type="Textfield" name="myText" length="25">
 <br>
 <input type="Button" name="showTextBtn" value="Show Text" onClick="showText()">
 </form>
 <hr>
 </center>
 </body>
 </html>
 [/code]

funky substring

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