how to create a Custom Scrollbar
code to sorting an array of objects
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create Drop-Down Navigation Menus
how to create a Draggable element
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code to get the coordinates of a Click Event
code to detect versions of different browsers like internet explorer, netscape, mozilla, opera etc
write a function to validate a given date
i am making a purchase sheet in html ,it contain names of product(by selecting checkboxes),quantity(textbox) and price(checbox), by using java script i am restricting the user to prevent them to enter the wrong data ,so i made the servlet were i am only able to prevent them to enter the page in empty field , so my doubt is how do you prevent them how to enter non numerical data in quantity field
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