String Validation : String « Language Basics « JavaScript DHTML

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JavaScript DHTML » Language Basics » String

String Validation


  



<html>

<head>

<title>String Validation</title>

<script language="JavaScript">

<!--

function isString(textObj) {

   var newValue = textObj.value;

   var newLength = newValue.length;

   var extraChars=". -,";



   var search;

   for(var i = 0; i != newLength; i++) {

      aChar = newValue.substring(i,i+1);

      aChar = aChar.toUpperCase();

      search = extraChars.indexOf(aChar);

      if(search == -1 && (aChar < "A" || aChar > "Z") ) {

         return false;

      }

   }

   return true;

}

//-->

</script>

</head>

   

<body>

<h1>String Validation</h1>

<form name="form1">

<input type="text" size=16 name="data">

<input type="button" name="CheckButton" value="Validate" onClick="document.form1.result.value = '' +

    isString(document.form1.data)">

<br> Result <input type="text" size=16 name="result">

</form>

</body>

</html>

Related examples in the same category

1.	Demo all String methods
2.	String utility: word count, replace and capitalize
3.	Strip Commas
4.	Text Range Search and Replace (IE only)
5.	Counting the Words in a Text String
6.	Reversing a String
7.	Trimming a String Using Regular Expressions
8.	String encode and decode
9.	Capitalizing the First Letter in Each Word of a String
10.	Playing with Strings
11.	Using the String Object's Link Method
12.	Using a for Loop to Reverse a String
13.	Concatenate JavaScript String
14.	String length: number of characters in a string.
15.	String fontcolor(): a string in a specified color
16.	String indexOf(): string position
17.	Using Quotes within Strings
18.	Using the String Object
19.	String toUpperCase
20.	Lab for string.replace() and string.search()
21.	Slicing a String
22.	A String Object Prototype
23.	Creating a Custom toString() Method
24.	Reading a Portion of a String
25.	Source Code for a Sample Page That Formats a String Object with the 'a' Tag
26.	Source Code for Our String-Formatting Script
27.	Adding a replace() Method to the String Object
28.	Creating a Function That Will Search and Replace in Strings
29.	Using the indexOf() Method to Find All Occurrences of the Letter e in a Sentence
30.	Methods and Properties of the String Object
31.	String match(): returns the text if found
32.	String substr() and substring(): returns a specified part of a string
33.	String toLowerCase() and toUpperCase(): converts a string to lowercase and uppercase
34.	Converting Strings to Upper Case
35.	String encoder
36.	Concatenate two string variables together
37.	Search string value in an array

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