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WGU (KVO1) Web Development Applications Exam - Topic 3 Question 1 Discussion
Topic #: 3
Given the following code:
Which type of user input does the developer request by specifying the pattern attribute?
The pattern attribute in the <input> element is used to specify a regular expression that the input's value must match for it to be considered valid. The given pattern -?d{1,3}.d+ matches strings that represent decimal numbers with an optional negative sign, typically used for latitude and longitude values.
Pattern
-? allows for an optional negative sign.
d{1,3} matches one to three digits.
. matches a literal dot.
d+ matches one or more digits.
Usage Example:
<input type='text' pattern='-?d{1,3}.d+' placeholder='Enter latitude or longitude'>
This pattern ensures the input matches the format of latitude/longitude values.
MDN Web Docs on <input> pattern attribute
Regular Expressions Documentation
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