I have a HTML button and i am just curious an wanna know whether its possible to call a codebehind method without using onclick event
<input type="button" value="Sig-In" id="btnlogin"/>
If the button does a post back, page events like Page_Load will be fired without even having a click event handler. Why can't you just use click event handler?
you can use event load in javascript:
<input type="button" value="Sig-In" id="btnlogin"/>
and javascript you use like that:
$(document).ready(function() {
$( "#btnlogin" ).load( "ajax/test.html", function() {
alert( "Load was performed." );
});
});
this is example in http://jsfiddle.net/YBS4r/2/
I am trying to undo an event handler/listener that is added in an linked JS file in the header of the webpage.
The basic setup:
<form id="form_enter_giveaway" action="" method="post">
<input type="hidden" name="form_key" value="04b931caff99a0a688241e6da5f09839">
<input type="hidden" name="enter_giveaway" value="1">
Enter to Win! (1P)
</form>
JS file (http://www.steamgifts.com/js/header_functions.js):
$('.submit_entry, .remove_entry').click(function(){
$('#form_enter_giveaway').submit();
return false;
});
There is nothing native that should run if I click that link, and searching every reference to that link and that form in general seems to show that that single piece of JS is the only thing that could possibly be causing the form to submit.
But I have tried $('.submit_entry, .remove_entry') .unbind(), .off(), die() with the console; All with and without 'click', and every time I click that link tag it still submits. And it is interfering with the event I want to have run in its place.
Try this
var $selector = $('.submit_entry, .remove_entry');
// Binding the event using on so that it can be unbinded later
// that triggers the submitForm handler
$selector.on('click', submitForm);
function submitForm() {
$('#form_enter_giveaway').submit();
return false
}
// Unbind the event using off
$selector.off('click');
// Bind the event and prevent the default action of anchor
$selector.on('click', function(e) {
e.preventDefault();
});
Check Fiddle
Newbie to jQuery here. I have a check box that is dynamically added through the following code in jQuery:
.html("<input type='checkbox' class='checkbox' value='7.5'>");
I want to be able to eventually call a function if a checkbox is clicked. I have tried using these two variants of code:
for the class checkbox:
$(".checkbox").live('click', function() {
alert('test');
});
or to call all checkboxes:
$(":checkbox").live('click', function() {
alert('test');
});
This isn't working at all. Any ideas?
Much appreciated!
.live() is deprecated. Use the event delegation syntax:
$(document).on('change', 'input[type="checkbox"]', function(e) {
alert(e);
});
Replace document with the selector of the closest parent element that's present when you bind the event handler. I'd also suggest not to use :checkbox, as it's a non-native selector and will be slower than input[type="checkbox"]
I have a form with several different fieldsets. I have some jQuery that displays the field sets to the users one at a time. For browsers that support HTML5 validation, I'd love to make use of it. However, I need to do it on my terms. I'm using JQuery.
When a user clicks a JS Link to move to the next fieldset, I need the validation to happen on the current fieldset and block the user from moving forward if there is issues.
Ideally, as the user loses focus on an element, validation will occur.
Currently have novalidate going and using jQuery. Would prefer to use the native method. :)
TL;DR: Not caring about old browsers? Use form.reportValidity().
Need legacy browser support? Read on.
It actually is possible to trigger validation manually.
I'll use plain JavaScript in my answer to improve reusability, no jQuery is needed.
Assume the following HTML form:
<form>
<input required>
<button type="button">Trigger validation</button>
</form>
And let's grab our UI elements in JavaScript:
var form = document.querySelector('form')
var triggerButton = document.querySelector('button')
Don't need support for legacy browsers like Internet Explorer? This is for you.
All modern browsers support the reportValidity() method on form elements.
triggerButton.onclick = function () {
form.reportValidity()
}
That's it, we're done. Also, here's a simple CodePen using this approach.
Approach for older browsers
Below is a detailed explanation how reportValidity() can be emulated in older browsers.
However, you don't need to copy&paste those code blocks into your project yourself — there is a ponyfill/polyfill readily available for you.
Where reportValidity() is not supported, we need to trick the browser a little bit. So, what will we do?
Check validity of the form by calling form.checkValidity(). This will tell us if the form is valid, but not show the validation UI.
If the form is invalid, we create a temporary submit button and trigger a click on it. Since the form is not valid, we know it won't actually submit, however, it will show validation hints to the user. We'll remove the temporary submit button immedtiately, so it will never be visible to the user.
If the form is valid, we don't need to interfere at all and let the user proceed.
In code:
triggerButton.onclick = function () {
// Form is invalid!
if (!form.checkValidity()) {
// Create the temporary button, click and remove it
var tmpSubmit = document.createElement('button')
form.appendChild(tmpSubmit)
tmpSubmit.click()
form.removeChild(tmpSubmit)
} else {
// Form is valid, let the user proceed or do whatever we need to
}
}
This code will work in pretty much any common browser (I've tested it successfully down to IE11).
Here's a working CodePen example.
You can't trigger the native validation UI (see edit below), but you can easily take advantage of the validation API on arbitrary input elements:
$('input').blur(function(event) {
event.target.checkValidity();
}).bind('invalid', function(event) {
setTimeout(function() { $(event.target).focus();}, 50);
});
The first event fires checkValidity on every input element as soon as it loses focus, if the element is invalid then the corresponding event will be fired and trapped by the second event handler. This one sets the focus back to the element, but that could be quite annoying, I assume you have a better solution for notifying about the errors. Here's a working example of my code above.
EDIT: All modern browsers support the reportValidity() method for native HTML5 validation, per this answer.
In some extent, You CAN trigger HTML5 form validation and show hints to user without submitting the form!
Two button, one for validate, one for submit
Set a onclick listener on the validate button to set a global flag(say justValidate) to indicate this click is intended to check the validation of the form.
And set a onclick listener on the submit button to set the justValidate flag to false.
Then in the onsubmit handler of the form, you check the flag justValidate to decide the returning value and invoke the preventDefault() to stop the form to submit. As you know, the HTML5 form validation(and the GUI hint to user) is preformed before the onsubmit event, and even if the form is VALID you can stop the form submit by returning false or invoke preventDefault().
And, in HTML5 you have a method to check the form's validation: the form.checkValidity(), then in you can know if the form is validate or not in your code.
OK, here is the demo:
http://jsbin.com/buvuku/2/edit
var field = $("#field")
field.keyup(function(ev){
if(field[0].value.length < 10) {
field[0].setCustomValidity("characters less than 10")
}else if (field[0].value.length === 10) {
field[0].setCustomValidity("characters equal to 10")
}else if (field[0].value.length > 10 && field[0].value.length < 20) {
field[0].setCustomValidity("characters greater than 10 and less than 20")
}else if(field[0].validity.typeMismatch) {
field[0].setCustomValidity("wrong email message")
}else {
field[0].setCustomValidity("") // no more errors
}
field[0].reportValidity()
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="email" id="field">
Somewhat easy to make add or remove HTML5 validation to fieldsets.
$('form').each(function(){
// CLEAR OUT ALL THE HTML5 REQUIRED ATTRS
$(this).find('.required').attr('required', false);
// ADD THEM BACK TO THE CURRENT FIELDSET
// I'M JUST USING A CLASS TO IDENTIFY REQUIRED FIELDS
$(this).find('fieldset.current .required').attr('required', true);
$(this).submit(function(){
var current = $(this).find('fieldset.current')
var next = $(current).next()
// MOVE THE CURRENT MARKER
$(current).removeClass('current');
$(next).addClass('current');
// ADD THE REQUIRED TAGS TO THE NEXT PART
// NO NEED TO REMOVE THE OLD ONES
// SINCE THEY SHOULD BE FILLED OUT CORRECTLY
$(next).find('.required').attr('required', true);
});
});
I seem to find the trick:
Just remove the form target attribute, then use a submit button to validate the form and show hints, check if form valid via JavaScript, and then post whatever. The following code works for me:
<form>
<input name="foo" required>
<button id="submit">Submit</button>
</form>
<script>
$('#submit').click( function(e){
var isValid = true;
$('form input').map(function() {
isValid &= this.validity['valid'] ;
}) ;
if (isValid) {
console.log('valid!');
// post something..
} else
console.log('not valid!');
});
</script>
Html Code:
<form class="validateDontSubmit">
....
<button style="dislay:none">submit</button>
</form>
<button class="outside"></button>
javascript( using Jquery):
<script type="text/javascript">
$(document).on('submit','.validateDontSubmit',function (e) {
//prevent the form from doing a submit
e.preventDefault();
return false;
})
$(document).ready(function(){
// using button outside trigger click
$('.outside').click(function() {
$('.validateDontSubmit button').trigger('click');
});
});
</script>
Hope this will help you
For input field
<input id="PrimaryPhNumber" type="text" name="mobile" required
pattern="^[789]\d{9}$" minlenght="10" maxLength="10" placeholder="Eg: 9444400000"
class="inputBoxCss"/>
$('#PrimaryPhNumber').keyup(function (e) {
console.log(e)
let field=$(this)
if(Number(field.val()).toString()=="NaN"){
field.val('');
field.focus();
field[0].setCustomValidity('Please enter a valid phone number');
field[0].reportValidity()
$(":focus").css("border", "2px solid red");
}
})
$('#id').get(0).reportValidity();
This will trigger the input with ID specified. Use ".classname" for classes.
When there is a very complex (especially asynchronous) validation process, there is a simple workaround:
<form id="form1">
<input type="button" onclick="javascript:submitIfVeryComplexValidationIsOk()" />
<input type="submit" id="form1_submit_hidden" style="display:none" />
</form>
...
<script>
function submitIfVeryComplexValidationIsOk() {
var form1 = document.forms['form1']
if (!form1.checkValidity()) {
$("#form1_submit_hidden").click()
return
}
if (checkForVeryComplexValidation() === 'Ok') {
form1.submit()
} else {
alert('form is invalid')
}
}
</script>
Another way to resolve this problem:
$('input').oninvalid(function (event, errorMessage) {
event.target.focus();
});
I have a form with several submit buttons. I want my last button to handle the submit rather than the HTML5 spec'ed first button.
I can't change the html at this point and am fairly sure this requires JS. But when I've given it a shot I've gotten into nasty loops or dead code trying to prevent default behaviour and then fire my other button.
Has anyone done this before? jQuery is on the page if needed.
Thanks,
Denis
Since you mentioned jQuery :)
If all you want to do is submit your form when a user presses the enter key, then
$(function() {
$('body').keypress(function(e) {
if (e.which == 13) {
e.preventDefault();
$('#myForm').submit();
}
});
});
However, if you have different behavior/forms depending on which button is clicked and you want the enter key to trigger your last button's click event, then
$(function() {
$('body').keypress(function(e) {
if (e.which == 13) {
e.preventDefault();
$('input[type="submit"]:last').click();
}
});
});
You should just change the input element's type attribute to button instead when you don't want it to submit the form. (I know you said you can't really change the HTML, but this is the best way)
<input type="button" name="mybutton" class="submit-button" value="I wont submit!" />
jQuery code:
$('.submit-button').click(function() {
$('#secret-value-field').val($(this).val());
$(this).parents('form').submit();
});
Or something along those lines.