Need to simulate keypress jquery - javascript

I have a function that uses the value of a textbox (prodinput) to hide/show links in a dropdown list. It works when a user types in a string manually but when I want to auto-populate the value by passing a url parameter I'll need to trigger a keyup or keydown to get it to call the function.
Here is the function that does the search (located in the core.js):
prodinput.on('keyup, keydown',function() {
var search = $(this).val().toLowerCase();
$('.support-product .browse-products a').each(function() {
if($(this).text().toLowerCase().search(search) > -1) {
$(this).parent().show();
} else {
$(this).parent().hide();
}
});
});
Here is the function I'm using to trigger the function above (located on the page I'm trying to run it on.
$(function(){
$target = $('.browse-products .display');
$target.val($trimmed);
$('.browse-products').addClass('active');
$target.focus();
var e = jQuery.Event( "keydown" );
$target.trigger(e);
});
I've tried using:
$target.keyup();
and as shown above:
var e = jQuery.Event( "keydown" );
$target.trigger(e);
I'm wondering if it's a problem with the order in which things load on the page.

I'd put your keyup code in a named function.
$(function () {
myFunction();
prodinput.on('keyup, keydown', function () {
myFunction();
})
};
var myFunction = function () {
var search = $('#prodinput').val().toLowerCase();
$('.support-product .browse-products a').each(function () {
if ($(this).text().toLowerCase().search(search) > -1) {
$(this).parent().show();
} else {
$(this).parent().hide();
}
});
};

Assuming you don't need to support ancient browsers you can just listen for the input event which covers keypress and change events. Then after attaching the listener simply trigger the event:
$(function() {
$("#prodinput").on('input', function() {//alternatively you could use change and keyup
var search = $(this).val().toLowerCase();
$('.support-product .browse-products a').each(function() {
if ($(this).text().toLowerCase().search(search) > -1) {
$(this).parent().show();
} else {
$(this).parent().hide();
}
});
}).trigger("input");//trigger the event now
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="search" id="prodinput" value="peanuts" />
<div class="support-product">
<ul class="browse-products">
<li>jam</li>
<li>elephants</li>
<li>peanuts</li>
</ul>
</div>

Related

How do you prevent additional .keyup event after selecting data list item in dropdown?

When using AJAX to auto populate html datalist, why does selecting datalist item trigger another event? I am using jquery keyup to auto suggest queries, after I select a list item the string is placed in the input box correctly but then it triggers the keyup event again which makes the datalist dropdown stay open, covering button.
$(function () {
$('#searchTerm').keyup(function (e) {
var search = $(this).val();
$.post(host/search, {search: search}, function (data) {
$('#list').html(data);
});
});
});
I expect clicking a datalist item to populate the input field with the string selected and then the datalist to disappear, but instead it triggers an additional .keyup event and persists.
The auto suggest feature is quite common so I apologize if I am overlooking anything obvious.
$(function() {
var keyupFired = false;
$('#text').keyup(function(e) {
if (!keyupFired) {
console.log("Yes...");
keyupFired = true;
setTimeout(function() {
alert("OK!!!");
keyupFired = false;
}, 3000);
} else {
console.log("No...");
e.preventDefault();
}
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.0/jquery.min.js"></script>
<input type='text' id='text' name='text' placeholder='please enter text....' />
$(function() {
var keyupFired = false; // intialize the flag
if (!keyupFired) {
keyupFired = true; // before starting the task
$('#searchTerm').keyup(function(e) {
var search = $(this).val();
$.post(host / search, {
search: search
}, function(data) {
$('#list').html(data);
keyupFired = false; //completed its task so again make `keyupFired =false`
});
});
} else {
e.preventDefault();
}
});
To implement this functionality you need to maintain one flag.

Call a onkeyup function when click on other button jQuery

I have function which has keyup event on input field which is working fine.
I want to trigger this function also upon click on other button.
Here is my function
function validateChild(el) {
var validated = {};
console.log('Remove button clicked');
var dateOfBirthField = $(el).find('.date_of_birth');
$(dateOfBirthField).on("keyup", function () {
var dateOfBirthValue = $(el).find('.date_of_birth').val();
console.log('Check DoB');
if(validateDateOfBirth(dateOfBirthValue, dateOfBirthField)){
console.log('True');
validated.dateOfBirth = true;
} else {
validated.dateOfBirth = false;
}
validateButton(validated);
});
}
I'm calling this function on document load
function validateForms() {
$(document).find(".child-form").each(function () {
validateChild(this);
});
}
Here i have click event
.on('click', '.removeButton', function (event) {
validateForms();
});
When i click on this remove button it trigger but stop working after this
console.log('Remove button clicked');
How can i trigger keyup event also on this remove button, or there is better way to do this in javascript.
Can anyone help me with this?
Thanks
I have reviewed your three code blocks. Please try following three code blocks respectively.
Your function
function validateChild(dateOfBirthField) {
var validated = {};
var dateOfBirthValue = $(dateOfBirthField).val();
console.log('Check DoB');
if(validateDateOfBirth(dateOfBirthValue, dateOfBirthField)){
console.log('True');
validated.dateOfBirth = true;
} else {
validated.dateOfBirth = false;
}
validateButton(validated);
}
Call this function on document load
function validateForms() {
$('.child-form').on('keyup', '.date_of_birth', function() {
validateChild(this);
});
}
Click event
.on('click', '.removeButton', function() {
console.log('Remove button clicked');
$('.child-form .date_of_birth').each(function() {
validateChild(this);
});
});

What does colon mean in jQuery when used inside of .trigger?

I looked at http://api.jquery.com/trigger/ and the examples did not answer my question. I am looking at some code and would like to know what this block of code is doing.
$(document).on('click', '#SubmitQuery', function(event) {
event.preventDefault();
$(document).trigger('filter:submit');
});
Specifically, what does the colon inside of that trigger function do? For complete context, here is what filter is (I assume that the 'filter' inside of the trigger function refers to that filter object):
var filter = {
init: function() {
$(document).on('keypress', '#Filter', debounce(function(event) {
if (event.keyCode == 13) {
$(document).trigger('filter:text');
}
}, 300));
$(document).on('click', '#ClearFilter', function(event) {
event.preventDefault();
$('#FilterText').val('');
$('#FilterText').focus();
$(document).trigger('filter:clear');
});
$(document).on('change', '.filterSection [type=checkbox]', function(event) {
var group = $(this).parents('[data-filter-group]').attr('data-filter-group');
var $checkboxes = $('[data-filter-group=' + group + '] [type=checkbox]');
if ($checkboxes.length > 0) {
if ($checkboxes.filter(':checked').length === 0) {
$(this).prop('checked', true);
}
}
});
$(document).on('click', '#SubmitQuery', function(event) {
event.preventDefault();
$(document).trigger('filter:submit');
});
$("#Filter").focus();
}
};
The colons specifies custom events, essentially creating namespaces for events you can call later without overriding default events or having to create multiple listeners on the same event.
You can find more information here: https://learn.jquery.com/events/introduction-to-custom-events/

determine which event is currently triggered in jquery

if I'm fetching multiple events using jquery how can I determine which event is currently triggered so I can processed further, for example
$("#someId").on('paste blur', function (e) {
var data = '';
// if paste
data = e.originalEvent.clipboardData.getData('text')
// if blur
data = $("#someId").val();
});
You can use event.type to get the current event,
$("#someId").on('paste blur', function (e) {
if ('paste' == e.type) {
data = e.originalEvent.clipboardData.getData('text')
} else if ('blur' == e.type) {
data = $("#someId").val();
}
});
You can use Event.type.
$("#someId").on('paste blur', function (e) {
var data = '';
if(e.type == 'paste') {
data = e.originalEvent.clipboardData.getData('text')
}
if(e.type == 'blur') {
data = $("#someId").val();
}
});
You might wish to consider registering separate handlers depending on how different you're going to handle the events though.
To avoid unnecessary if conditions you can add only the events you actually needs:
// Bind up a couple of event handlers
$("#txt").on({
click: function() {
console.log("click")
},
mouseout: function() {
console.log("mouseout")
},
change: function() {
console.log("change")
}
});
//Lookup events for this particular Element
//prints out an object with all events on that element
console.log($._data($("#txt")[0], "events"));
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" id="txt" />

JQuery Check if input is empty not checking onload?

I am using this code to check if an inputbox is empty or not and it works fine but it only checks check a key is press not when the page loads.
It's does what it should but I also want it to check the status when the page loads.
Here is the current code:
$('#myID').on('keyup keydown keypress change paste', function() {
if ($(this).val() == '') {
$('#status').removeClass('required_ok').addClass('ok');
} else {
$('#status').addClass('required_ok').removeClass('not_ok');
}
});
Try the following:
$(function() {
var element = $('#myID');
var toggleClasses = function() {
if (element.val() == '') {
$('#status').removeClass('required_ok').addClass('ok');
} else {
$('#status').addClass('required_ok').removeClass('not_ok');
}
};
element.on('keyup keydown keypress change paste', function() {
toggleClasses(); // Still toggles the classes on any of the above events
});
toggleClasses(); // and also on document ready
});
The simplest way to do is trigger any of the keyup,keydown etc event on page load. It will then automatically call your specific handler
$(document).ready(function(){
$("#myID").trigger('keyup');
});
try checking the value on a doc ready:
$(function() {
if ($('#myID').val() == '') {
$('#status').removeClass('required_ok').addClass('ok');
} else {
$('#status').addClass('required_ok').removeClass('not_ok');
}
});
EDIT: just as an update to this answer, a nicer approach might be to use toggle class, set up in doc ready then trigger the event to run on page load.
function check() {
var $status = $('#status');
if ($(this).val()) {
$status.toggleClass('required_ok').toggleClass('ok');
} else {
$status.toggleClass('required_ok').toggleClass('not_ok');
}
}
$(function () {
$('#myID').on('keyup keydown keypress change paste', check);
$('#myID').trigger('change');
});
Well then why dont just check the field after the page is loaded?
$(document).ready(function(){
if ($('#myID').val() == '') {
$('#status').removeClass('required_ok').addClass('ok');
} else {
$('#status').addClass('required_ok').removeClass('not_ok');
}
});
$(document).ready(function(){
var checkVal = $("myID").val();
if(checkVal==''){
$('#status').removeClass('required_ok').addClass('ok');
}
else{
$('#status').addClass('required_ok').removeClass('not_ok');
}
});

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