Lecture-17-React Part 3 - George Mason University
React Part 3
SWE 432, Fall 2019
Web Application Development
Review: Cascading selectors
? What happens if more than one rule applies? ? Most specific rule takes precedence
? p b is more specific than p ? #maximizeButton is more specific than button ? If otherwise the same, last rule wins ? Enables writing generic rules that apply to many elements that are overriden by specific rules applying to a few elements
LaToza
GMU SWE 432 Fall 2019
2
Review: Centering content
? How do you center an element inside a container?
? Step 1: Must first ensure that element is narrower than container.
? By default, element will expand to fill entire container.
? So must usually explicitly set width for element.
? Step 2: Use auto value for left and right to create equal gaps
LaToza
GMU SWE 432 Fall 2019
3
Review: Transitions
? transition: [property time], ..., [property time] ? When new class is applied, specifies the time it will take for each property to change ? Can use all to select all changed properties
LaToza
GMU SWE 432 Fall 2019
4
Review: Fixed width vs. liquid layouts
? Fixed width ? Use width="[num]px" to force specific sizes ? Allows for tightest control of look and feel ? But can end up with extra whitespace around edge of web page
? Liquid layout ? Use width="[num]%" to size relative to container sizes ? Pages expand to fill the entire container size ? Problems ? Wide windows may create long lines of text can be difficult to read ? Very narrow windows may squash words, breaking text onto many lines ? (Partial) solution ? Can use min-width, min-height, max-width, max-height to set bounds on sizes
LaToza
GMU SWE 432 Fall 2019
5
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