Cross-browser screen dimensions with JavaScript
In order to calculate the user’s available screen width and height use the screen object:
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JavaScript replaceAll Function
The JavaScript replace() function does not replace all instances of the query string - only the
first one encountered. This function replaces all instances of the unwanted string.
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JavaScript Trim Method
There are number of ways you can trim strings using javascript. The best way is to prototype
the string object, adding a trim method, so you can perform the action by merely calling
“string.trim()”.
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JavaScript Error Handling
Error trapping with JavaScript only works for newer generation browsers. However, older browser generally
ignore window.onerror code, so it is worth putting in. There are two ways to do this:
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JavaScript Regular Expressions
Regular expressions are objects in JavaScript. For example, if you have an input field that should only
allow characters a-z (lower and upper case) and numerical digits, you could use regular expressions to
do the input validation as follows:
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