Upon clicking a submit button, I would like to do some client side validation to ensure there are fewer than 5 commas in a text box with the class of submit-btn. I can use javascript, jquery and/or regex here.
What code should I place within this function?
$('.submit-btn').on("click", function() {
<< WHAT GOES HERE? >>
});
Any help is greatly appreciated.
I use regex to find the number of times the string ,
occurs in the textbox value. It prints whether or not it is valid (having less than 5 commas).
$("#validate").click(function () { console.log(($("#textboxInfo").val().match(/,/g)||[]).length < 5) });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input type="text" id="textboxInfo" /> <button id="validate">less than 5 commas?</button>
In this particular situation, I'd prefer to have live validation. This can be accomplished by using the input
event.
$("#textboxInfo").on('input', function () { var isValid = ($(this).val().match(/,/g) || []).length < 5; $(".isValid").html(isValid ? "Valid" : "Invalid"); }).trigger('input');
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input type="text" id="textboxInfo" value="I really love ,,, commas!" /> <div class="isValid"> </div>
Split
the value of the input box and filter
out ,
and check the length of it
$('.submit-btn').on("click", function() { var getNumbers = $('#testBox').val().split('').filter(function(item) { return item === ',' }).length; console.log(getNumbers) });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input type='text' id='testBox'> <button class='submit-btn' type="button">Click</button>
You could try using this Comma Counter
$('button').on('click',function(){ var counter = ($('div').html().match(/,/g) || []).length; $('.result').text(counter); } )
/
You could also remove everything that is not a comma [^,]
, replace that with an empty string and count the length of the string.
$('.submit-btn').on("click", function() { var nr = $("#tbx").val().replace(/[^,]/g, "").length; console.log("Fewer than 5 commas? " + (nr < 5 ? "Yes" : "No") + " there are " + nr + " commas."); });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input type='text' id='tbx'> <button class='submit-btn' type="button">Click</button>
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.