Answer / Ashvin Yadav

Here's an example of how to hide and show form controls using JavaScript:n```javascriptnfunction toggleVisibility(id) {n var element = document.getElementById(id);n if (element.style.display === "none") {n element.style.display = "block";n } else {n element.style.display = "none";n }n}n```

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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