javascript - JQuery if input starts with a value -


i managing check value inside postcode input field using following:

html:

<input type="text" class="cart-postcode2" size="10" tabindex="22">

jquery:

$('.cart-postcode2').keyup(function(){     var value = $(this).val();     if (value.indexof('bt') >= 0) {       alert("is ireland");     } })

this working great want alert if starts bt , not contain bt in part of value, know if possible?

so typing bt2 9nh alert "ireland" typing ox2 8bt not

you can check if string starts bt, indexof() give index 0 if value stats bt

$('.cart-postcode2').keyup(function(){     var value = $(this).val();     if (value.indexof('bt') == 0) {       alert("is ireland");     } })

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