$.expr[':'].containsCaseInsensitive = function (n, i, m) {
return jQuery(n).text().toUpperCase().indexOf(m[3].toUpperCase()) >= 0;
};
.expr is not recognized.
To ensure it's defined, I included a CDN link below:
<script src="https://cdnjs.cloudflare.com/ajax/libs/sizzle/2.2.1/sizzle.js"></script>
If the script is in the header, expr should be defined. But sometimes errors may occur like:
Uncaught TypeError: Cannot read properties of undefined (reading 'expr')
With the release of jQuery 1.8, there was an update to the API for this specific function. For versions 1.8 and above, the syntax would be as follows:
jQuery.expr[":"].Contains = jQuery.expr.createPseudo(function(arg) {
return function( element ) {
return jQuery(element).text().toUpperCase().indexOf(arg.toUpperCase()) >= 0;
};
});
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