How to check if a string contains substring in Java Script?
To check this you can use String.indexOf(subString), which returns position of the first occurrence of subString or -1, if it wasn't found.
var str= 'test Text'; var subStr = 'test'; if( str.indexOf( subStr ) !== -1 ) alert( 'substring found' );
indexOf is case sensitive, to check for subString regardless of its case sensitivity you can use the following code:
var str= 'test Text'; var subStr = 'TEXT'; if( str.toLowerCase().indexOf( subStr.toLowerCase() ) !== -1 ) alert( 'substring found' );
Continue reading here: Forms in HTML5
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