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    Javascript : validating form field for numeric value

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    Write a JavaScript function to validate a text field on a form for holding a positive integer value, without using any inbuilt functions like IsNaN and so forth. If the text field contains a valid number then the JavaScript function will return "true", otherwise it will return "false" along with displaying a popup error message.

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    Solution Preview

    Following JavaScript function will validate it's argument for being a positive integer. Attached 118393.html shows it in ...

    Solution Summary

    Solution presents a sample javascript function implementation that checks the argument text value for being a positive integer, without using any inbuilt functions for this purpose. Sample html file is also provided with the solution for quick testing.