Help with showing text when something is entered in my search bar

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You can do that using jQuery’s focus function. add following into your php file inside <script> tags.

$("#your-searchinput-id").focus(function() {
    $("h4.title_sidebarsub").text("<?php echo $string ?>")
});
$(this).blur(function() {
    $("h4.title_sidebarsub").text("mijn gemeente")
});