Having the actual visible width of a box turn out differently from what you declared in the CSS is a bit mind bending.īut, in the days of fixed-width design, it wasn’t particularly complicated to work with the default box model once you understood it. Some people preferred this “quirky” interpretation of the box model and considered it more intuitive. The box at the bottom shows what was once the “quirks mode” interpretation of the box model. The box at the top shows the default box model. The border and padding values were moved inside the element's box, cutting into the width/height of the box rather than expanding it. Height = actual visible/rendered height of an element's box Width = actual visible/rendered width of an element's box This can be a little counter-intuitive, since the width and height you set for an element both go out the window as soon as you start adding padding and borders to the element.īack in the old days of web design, early versions of Internet Explorer (<= IE6) handled the box model differently when it was in "quirks mode". Height + padding + border = actual visible/rendered height of an element’s box Width + padding + border = actual visible/rendered width of an element’s box ![]() Since the dawn of CSS, the box model has worked like this by default: It’s such a boon for developers that here at CSS-Tricks we observe International Box-Sizing Awareness Day in February.īut, how is it so helpful and beloved that it deserves its own internet holiday? Time for a little bit of CSS history. I added three public properties ( Title, ImageURL, and OpenOnStart) and overrode the Render procedure.įor my convenience when rendering the control, I added the reference to JQuery library inside the Render procedure, but you can do it differently.The box-sizing property can make building CSS layouts easier and a lot more intuitive. Obviously, this control will inherit from CheckBoxList control. CSS (either a file of just a style tag).I also realized that CSS will be involved to style this control the way I wanted. My JavaScript of choice would be JQuery, which is very popular nowadays. I realized that it would be JavaScript driven, because I want to implement the client side click event to open and close the drop-down list. I decided to develop my own server side control. I also found a nice JQuery extension, but it was a pure client side solution and I had something else in mind. ![]() I found a few, but was not satisfied with the complexity and overall amount of code to implement them. So when the time had come and the web portal that I developed required to have such selection list, I started to do my homework and look for a suitable solution on the Internet. ![]() The combination of the drop-down list and check box list would be ideal for this purpose. ![]() It would be nice to use something like a drop-down list, but unfortunately the drop-down list control does not support multiple-item selection. The list box control selection is just highlighting of a row, which is a visually weak type of selection, multiple selection is not intuitive and is not convenient for the end user.Ĭheck box list has a strong visual selection type but takes a lot of space if the list is long enough. When a developer wants to display a list of items with the ability to select some of them, there are not many options available, actually it comes to only two:
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