Text box validating event

Standalone applications typically have a main window that both displays the main data over which the application operates and exposes the functionality to process that data through user interface (UI) mechanisms like menu bars, tool bars, and status bars.

A non-trivial application may also display additional windows to do the following: dialog box is displayed by a function when the function needs additional data from a user to continue.

Not the prettiest solution, but functional in all browsers with Java Script enabled.

Adding HTML5 validation to the checkbox is actually very simple.

Using vanilla Java Script we can prevent form submission as follows: All this does is confirm before submitting the form that the checkbox is checked.

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Less importantly, Numeric Up Down have annoying UI problems related to the font size.

But I am running into problem because this fires 2 times. My requirement is that it should fire only one time and set the value to 0. Did you consider to use the Numeric Up Down control?

It has Minimum and Maximum properties that control the allowable values.

All you need to do is include a This tells the browser that the form should not be allowed to submit without the checkbox checked.

Some, but not all, browsers will recognise and enforce this: The advantage of the HTML5 form validation is that it happens before our Java Script is called, displays instructions and points the user to the relevant element.

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