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In this video we will discuss, How to create page layouts using bootstrap grid system.
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One of the very important concept that we need to understand in Bootstrap is it's Grid System. The Grid system is used for creating page layouts through a series of rows and columns. The Grid System consists of 12 columns. This grid system is so flexible that you can create any page layout that you want.
Let us now see how to create a 3 column layout using the Bootstrap Grid System.
The page should be divided into 3 columns with 1:4:1 ratio. One important thing to keep in mind here is that, if we add the 3 numbers in the ratio (1:4:1), the sum should be equal to 12, because the bootstrap grid system consists of 12 columns. This means if the LEFT SIDE BAR column is 2 units, the MAIN CONTENT AREA column should be 8 units and the RIGHT SIDE BAR column should be 2 units. So when we add these 3 numbers (2 Units + 8 Units + 2 Units), we get 12 units.
Bootstrap includes several grid classes for creating layouts for different devices like mobile phones, tablets, laptops, desktops, etc. The table below shows the available bootstrap grid classes that you can use to create grid column layouts ranging from extra small devices like mobile phones to large devices like large desktop screens.
We will discuss these different classes in detail with examples in a later video. For now let's use .col-md-* class to create a 3 column layout.
There are 3 simple steps to create the 3 column layout that we want, using the bootstrap 12 column grid system
1. First, create a container. We do this by creating a [div] element using the bootstrap .container class. All the rows will be within this container.
2. Second, create a row within the container. We do this by creating a [div] element using the bootstrap .row class.
3. Finally within the row we create the 3 columns that we need. We do this by creating [div] elements using any of the bootstrap grid classes (.col-xs-*, .col-sm-*, .col-md-* & .col-lg-*). In this example we are using col-xs-* class.
Please note that here I am also using a custom class (.customDiv) to apply some custom styles to each of the div elements.
[div class="container"]
[div class="row"]
[div class="col-md-2"]
[div class="customDiv"]LEFT SIDE BAR[/div]
[/div]
[div class="col-md-8"]
[div class="customDiv"]MAIN CONTENT AREA[/div]
[/div]
[div class="col-md-2"]
[div class="customDiv"]RIGHT SIDE BAR[/div]
[/div]
[/div]
[/div]
Here is the definition of the custom css class (.customDiv)
.customDiv{
margin:3px;
min-height:300px;
background-color:silver;
text-align:center;
font-size:large
}
I have created this class in a stylesheet that I named CustomStyles.css. I have placed this in the root folder of the project.
Some important points to keep in mind when working with the bootstrap grid system to create page layouts
1. Rows must be placed within a container for proper alignment and padding.
2. Use rows to create horizontal groups of columns.
3. Content should be placed within columns, and only columns may be immediate children of rows.
4. If more than 12 columns are placed within a single row, each group of extra columns will, as one unit, wrap onto a new line.
5. Grid columns are created by specifying the number of twelve available columns you wish to span. For example, to create four equal columns we would use four .col-xs-3.
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