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Yehuda Shiran January 25, 2001
Extracting DOM Substrings
Tips: January 2001

Yehuda Shiran, Ph.D.
Doc JavaScript

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 Netscape 6 is richer in functionality than Internet Explorer 5, as far as text manipulation is concerned. The substringData() method is one example. Operating on text nodes, it extracts a substring from the text node data. You can specify the offset of the substring and its length. Here is its syntax: 

strValue = textObj.substringData(offset, count);

where:

  • offset is a long integer value indicating the offset of the substring, in characters, from the beginning of the string.
  • count is a long integer value indicating the number of characters to retrieve, starting from the specified offset.

Let's create a text node at the document level. We put the following line in the header of this tip:

txtObj = document.createTextNode("Doc JavaScript");

Now, let's extract a substring that starts at offset 4 and of length 5. Click this button to get the answer in Netscape 6. Click in Internet Explorer 5.x and get an error message:

Here is the definition of this button:

<FORM>
<INPUT TYPE="button" VALUE="Extract a Substring" onClick="javascript:alert(txtObj.substringData(4,5))">
</FORM>

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