Say I have an online form, and I want to figure out whether a user is entering an email that's already in use by the system. Can I tell the system to check the field against the database as soon as the user moves their cursor / selection away from the field? Could anyone point me in the right direction if this is actually possible?
You could attach a listener to the text field using jQuery's blur event, like so:
$('#MyEmailField').blur(function() {
// jQuery AJAX Call here, $.ajax(...)
})
For this You need to call ajax when user writing an email id means on blur event as below :
$('#yourfieldID').blur(function() {
var val = $(this).val();
$.ajax({
type: 'POST',
url: 'your url',
data: {email: val},
success: function (data) {
// check for response
});
}
});
});
Now In file which you called in ajax url, Your need to check data which is exist in database or not and according to that you need to send response and check it in sucess part of ajax call.
I hope you will get it.
Yes, it is possible using an AJAX call on the "onblur" event of Javascript (or "focusout" method of jQuery)
You could use something like this, in the HTML:
<input type="email" name="myinput" />
And the JS:
$( "input" ).focusout(function() {
var usr_email = $(this).value;
$.ajax({
method: "GET",
url: "some.php",
data: { email: usr_email }
}).done(function( response ) {
if(response == "taken"){
$("input").borderColor = "red";
}
});
}
You can check for email's availability through an Ajax call in database on text change or blur event of email textbox. Then notify the user accordingly.
As soon as user moves out of email field, say tab or mouse click, you need to trigger a function to make a Ajax call to your server. The triggering function would be onBlur of email field. Then check If user email exits, get back Ajax response to notify the user.
Related
I have an application that after performing a search, returns me multiple "fieldsets" with some hidden inputs (via AJAX!).
I want to use these inputs to send information to the server (again) via AJAX.
The names of these inputs are automatically listed with a prefix:
"video_url_1", "video_url_2", etc.
When the user clicks the button, the value of "video_url_1" or "video_url_2" will be sent via AJAX depending on the button to which it has clicked. To solve this I got the name of the button that was clicked and then I cut the name so that I only have one number, this number I put in a variable and then use it in the "data" section of AJAX.
I did the test by sending a locally stored input and it worked but when trying to send the inputs that were previously obtained by an ajax, it does not work.
What can be wrong? This is my code:
$(document).ajaxComplete(function(){
$('a.report_video').click(function() {
var idbutton = $(this).attr('id');
var idreport = idbutton.replace('report_video_', '');
//I'm still not using these variables, can they be used to pass the input data to ajax?
var videourl = $("#video_url_" + idreport).val();
var videoid = $("#video_id_" + idreport).val();
var videoserver = $("#server").val();
///////////
$.ajax({
type : 'POST',
url : 'https://example.com/script/script.php',
data : $($("#video_url_" + idreport)).serialize(), //It doesn't work
//For example, data: $("#server").serialize()
//Work fine, this input is stored locally.
beforeSend: function(){
$('#video_report_' + idreport).html('<img src="'+pluginUrl+'./assets/img/loading.svg" />');
}
}).done(function(data) {
$('#video_report_' + idreport).html(data);
});
return false;
});
});
Edit:
I just did some tests as suggested by Kevin B and I see that the problem I have is in the syntax when trying to send two dynamic ID's by Ajax.
The problem is that I do not know how to write them correctly, I know that is the problem because when I tried to send them separately they did work...
data : $($("#video_id_" + idreport), $("#video_url_" + idreport)).serialize(),
I'm not sure I completely understand your problem, but this might help.
You call your second AJAX call in the .success() method of the first AJAX call. Essentially chaining the responses.
$('#btn').click(function() {
$.ajax({
type: "POST",
url: 'someURL',
data: someData
}).done(function(firstCallData) {
// This OPTIONAL method fires when the AJAC call succeeded
// You can also put another AJAX call in here with the data returned from the first call
$.ajax({
type: "POST",
url: 'someURL',
data: firstCallData
}).done(function(data) {
// Do something with second AJAX call with data
}).fail(function(data) {
// Second AJAX call failed, handle error
});
}).fail(function(data) {
// This OPTIONAL method fires when the first response failed
}).always(function(data) {
// This OPTIONAL method fires regardless if the first call succeeded or failed.
});
});
I´am a UX designer and one of these JS dummie/"HTML coder" guys.
I need help or a hint to validate a simple HTML form via a second request which returns a JSON answere, before the form is send.
I have a really simple HTML form on a landingpage where the user can enter a coupon code:
<form id="tokensubmit" method="GET" action="https://www.xyz/cart.html">
<div class="form-group">
<input type="text" name="tokenCodeAdd" id="tokenCodeAdd" size="25" value="" class="form-control input-lg" placeholder="Please enter Coupon Code">
</div>
<input id="input_id" type="submit" class="btn btn-lg btn-warning btn-block" value="Submit">
</form>
If a user enters his Coupon code and hit the submit button, the code will be added to the action URL (https://www.xyz/cart.html) and the User is redirected to this cart.html page. If the coupon code is correct everything is fine. If not he receives an error message on the cart.html page.
So far so good.
BUT: I want to validate the coupon code without redirecting the user to a new website(cart.html).
The system offers a second URL for this already. A url like:
/checkout/validate.html?tokenCode=12345678
This returns a JSON answere with a status like:
{"error":"Wrong Coupon Code."}
if the Coupon code isnt right.
If it is valid, something like:
{"error":"null"}
returns.
What I am searching for is a simple solution to call the validation URL (validation.html) first on click on the "submit" button, parse the returning JSON, prevent the form from sending if "error" is something else than "null" and print the JSON message ("Wrong Coupon Code.") right above the form input.
If "error" = "null" the forms behavior should not change. It should just open the https://www.xyz/cart.html URL with the tokenCode attached as parameter.
What I´am trying/starting with looks like:
$('#tokensubmit').submit(function(event){
event.preventDefault();
var tokenCheck = $(this).find('input[id="tokenCodeAdd"]').val();
$.ajax({
url: '/checkout/validate.html'+tokenCheck,
type: 'GET',
success: function(data){
var jsonData = $.parseJSON(data);
}
});
});
Its just the beginning, I know. The real parsing part is missing and the error message output if the validation fails, or the redirect if not.
Anyone who could help?
And thx in advanced!
Small hint: The form is placed on a WordPress driven landingpage, so PHP and JQuery is an option.
The code you have for getting the validation is almost correct:
$('#tokensubmit').submit(function(event){
event.preventDefault();
var tokenCheck = $(this).find('input[id="tokenCodeAdd"]').val();
$.ajax({
// either attach the parameter like you are trying to do directly to the url,
// but in this way:
url: '/checkout/validate.html?tokenCode='+tokenCheck,
// or give the URL parameter(s) as data object to jQuery:
data: {
tokenCode: tokenCheck
}
type: 'GET',
// if you specify the dataType you want to receive as json,
// jQuery will parse it for you already
dataType: 'json',
success: function(data){
// now you can check the data for error or not, for example like:
if(data.error == null){
// do something (most likely REALLY submit the form now?)
}else{
alert('tokenCode invalid');
}
}
});
});
With jquery you can send through a data parameter and it will work out how to place it in the URL:
$.ajax({
url: '/checkout/validate.html',
type: 'GET',
data: {"tokenCode": tokenCheck}
success: function(data){
var jsonData = $.parseJSON(data);
}
});
I would also advise not doing an Ajax request at all if tokenCheck is empty.
Wouldn 't it be easier to check the coupon code when the user leaves the input field? First the example while submitting the whole form.
$('#tokensubmit').on('submit', function(event) {
event.preventDefault();
var validationSuccess = false;
$.ajax({
url : '/checkout/validate.html',
type : 'GET',
data : { tokenCode : $('#tokeninput').val() }
success : function(response) {
var data = $.parseJSON(response);
if (data.error === null) {
validationSuccess = true;
}
}
if (validationSuccess === true) {
$('#tokensubmit').off('submit').submit();
}
});
So what we 've done here? The submit event listener is nearly the same you 've done. We prevent the default submitting of the form and do an ajax request for validation the input value. If the request returns no error as response, we simply unbind the submit event listener from the form and submit the form again.
In my opinion it would be better to work with the blur event listener on the input field. In combination you could use the HTML5 Constraint Validation API. So you don 't have to submit the form and the ajax request would be done on blurring the input field. I think that would be the better user experience.
So here 's the blur event listener:
<input type="text" name="the-input-field" id="the-input-field" value="" required>
$('#the-input-field').on('blur', function(event) {
var element = this;
$.ajax({
url : '/checkout/validate.html',
type : 'GET',
data : { tokenCode : element.val() }
success : function(response) {
var data = $.parseJSON(response);
if (data.error !== null) {
element.setCustomValidity('Your input is invalid!');
// place some error message elsewhere in the markup
} else {
element.setCustomValidity('');
}
}
});
});
First we placed the required Attribute in the input element. It marks the input element as required. So if it 's empty you could not submit the form. Then we placed the blur event listener, which is doing the ajax request. If the response is false, we place a custom error via setCustomValidity. It is a native HTML5 Constraint Validation API function. If the custom error on the input element is set, you could not submit the form. If the user enters another token the request is done again on leaving the input element. If the token is valid, the custom error message will be removed and the form can be submitted.
I want to validate user entries on a WordPress post upon hitting the submit button, display an error message is there are problems, and submit the form if everything is OK. I have a PHP function that does the checking, returning true if data in form_data is OK, some error code otherwise. The following JavaScript issues the AJAX request, and was supposed to continue submitting the form upon successful checking, but it doesn't:
jQuery(document).ready(function() {
jQuery('#post').submit(function() {
var form_data = jQuery('#post').serializeArray();
var data = {
action: 'ep_pre_submit_validation',
security: '<?php echo wp_create_nonce( 'pre_publish_validation' ); ?>',
form_data: jQuery.param(form_data),
};
var proceed = false;
jQuery.post(ajaxurl, data, function(response) {
if (response.indexOf('true') > -1 || response == true) {
proceed = true;
} else {
alert("Error: " + response);
proceed = false;
}
});
jQuery('#ajax-loading').hide();
jQuery('#publish').removeClass('button-primary-disabled');
return proceed; //breakpoint here makes the code run
});
});
The code is adapted from a WPSE question, which originally didn't work for me as the form didn't get submitted. I found out that if the jQuery function bound to .submit() returns true, the form should be submitted, so that's what I tried to implement. With the code above, it doesn't seem to work at first (form doesn't get submitted when there are no errors), but upon close inspection with Firebug proceed seems to get the right result if a breakpoint is inserted at the return proceed line. It works as intended with valid data only if I wait it out a bit upon hitting the breakpoint, and then continue execution. If there are errors, the alert is issued without a problem.
What is the best way to handle this?
EDIT
Based on #Linus answer below, the following code works with both valid and invalid data:
jQuery(document).ready(function() {
jQuery('#post').submit(function() {
if(jQuery(this).data("valid")) {
return true;
}
var form_data = jQuery('#post').serializeArray();
var data = {
action: 'ep_pre_submit_validation',
security: '<?php echo wp_create_nonce( 'pre_publish_validation' ); ?>',
form_data: jQuery.param(form_data),
};
jQuery.post(ajaxurl, data, function(response) {
if (response.indexOf('true') > -1 || response == true) {
jQuery("#post").data("valid", true).submit();
} else {
alert("Error: " + response);
jQuery("#post").data("valid", false);
}
//hide loading icon, return Publish button to normal
jQuery('#ajax-loading').hide();
jQuery('#publish').removeClass('button-primary-disabled');
});
return false;
});
});
Short answer: You can't - not in this manner.
Some background: The callbacks you supply as arguments to functions such as $.post are executed asynchronously. This means that you will return proceed before your success callback has been executed, and proceed will always be false. With your breakpoint, if you wait until the success callback has executed, proceed will be true and all will be well.
So, if you want to submit the form after your ajax request has finished, you must submit it using javascript. This is pretty easy with jQuery, just do a jQuery $.post with data: $("yourForm").serialize() and url: yourForm.action.
This is basically what you already are doing, you just have to repeat that call to the URL to which you actually want to post the data.
EDIT:
Another way would be to set an attribute on your form, say valid, and in your submit handler check that:
jQuery("#post").submit(function() {
if($(this).data("valid")) {
return true;
}
// Rest of your code
});
And in the success callback for your validation ajax request you would set/clear that attribute, and then submit:
$("#post").data("valid", true).submit();
EDIT:
You also want to do your "ajax-loading"/button enabling inside the callback for $.post for the same reasons stated above - as it is, they will happen immediately, before your ajax call returns.
Bind your button to a validation function instead of submit. If it passes validation, call submit().
Wordpress has its own mechanism to process Ajax requests, using wp-admin/wp-ajax.php. This allows you to run arbitrary code on either side of the Ajax boundary without having to write the back and forth status-checking code and all that. Set up your callbacks and go....
The real question is - why are you doing validation server-side? Why can't you load in the validation criteria before - as the post is being written? Then your validation can happen real-time and not on-submit.
jquery.post is performed asynchronously, which means the JS will continue before it gets the reply. You're stuck with Diodeus's answer - bind the button to validtion which then submits the form (which makes it not degrade well), or change your $.post to ajax and turn off async, which will force it to wait for response before proceeding...possibly locking up JS on your page until it times out.
$.ajax({
type: 'POST',
url: ajaxurl,
async:false,
data: data,
timeout:3000,
success: function(){
}
});
What I'm looking for: way to have innate html 5 form validation using the required="true", where if the user clicks the "Submit" button, the first thing that happens is the automatic html 5 validation where it checks to see if "username" is provided by the user. If it's not, then it displays the ugly error bubble.
If it is provided, however, I then have my own custom validation for checking against the db if the username exists. If it does, then return true (allow submission), false otherwise. What's happening: the form is getting submitted. It's like it does not wait for the success callback to return true/false on whether or not it should be submitted.
I hope that's clear enough! Code below:
html:
<form>
<input type="text" required="true" id="username" />
<button type="submit">Submit</button>
</form>
js:
$("form").submit(function() {
$.ajax({
url: 'usernamechecker.php?username=' + $("#username").val(),
success: function(resp) {
if (!resp.UsernameExists) {
return true; // allow form submission
}
return false; // do not allow form submission
}
});
});
You can't return a value through a callback like that. The callback for "success" won't run until the "ajax" call has completed, long after the "submit" handler has already returned.
Instead of that, I'd just do the submit and let it return with an error if there are server-side issues (like "username in use" or whatever). There's no point making two round-trips. If there are no problems, it can just complete the operation and return whatever results page you want.
You need to add "async: false" as a parameter to your ajax call in order to force the call to finish before continuing on with the rest of the code.
$("form").submit(function(event) {
$.ajax({
async: false,
url: 'usernamechecker.php?username=' + $("#username").val(),
timeout: 1000,
success: function(resp) {
if (resp.UsernameExists) {
event.preventDefault(); // do not allow form submission
},
error: function() {
//fall back code when there's an error or timeout
},
});
});
I want to trigger this function, which uses the jquery's post method, when a form is submitted:
function update_point_session(){
$.post('/update_point_session/',
{session: true},
function(data){}
);
return true;
}
I uses the onsubmit to trigger it.
The problem is that it won't send it when the form is submitted. But if I return false; it will (though the form itself, of course, will not). It looks as if the $.post is not send before the page is directed to another one by the form..
So I think I somehow have to return true; AFTER the $.post. I tried to do this by putting it inside function(data){} but it did not work..
How can I send BOTH the post from jquery and from the form?
There are a couple of things you can do.
Make the AJAX synchronous
Since $.post is, according to the documentation, equivalent to
$.ajax({
type: 'POST',
url: url,
data: data,
success: success
dataType: dataType
});
You can simply replace $.post with the equivalent $.ajax call, and also add async: false to the options. This will submit the form with AJAX and then, due to the return true; from the function, will also let the browser post the form normally.
Submit the form only after the AJAX completes
This involves some event handler juggling:
// attach submit event handler to the form
$("#myform").submit(function() {
// Handler immediately detaches itself, so that
// we don't have an infinite loop when we call
// $(this).submit() ourselves below
$(this).unbind('submit');
// Do the AJAX
$.post(
'/update_point_session/',
{session: true},
function(data){
// When the AJAX completes, tell the browser
// to re-submit the form
$(this).submit();
}
);
// Prevent the browser from submitting it NOW,
// because the AJAX is still running
return false;
});
You must wait for the asynchronous post to complete before unloading the page. You can send back a redirect url from the server as json something like this:
$('form').submit(function(e){
$.post(this.action || '/update_point_session/', $(this).serialize(), function(data){
// send back a redirect url from the server
if(data.url) location.href = data.url;
});
e.preventDefault()
});
I would do something like this.
$('form#myFormId').submit(function(evt){
var form = $(this);
evt.preventDefault(); // Prevents default submission
$.post('/update_point_session/', {session: true}, function(data){
form.unbind('submit'); //Unbind js submit event
form.get(0).submit(); //submit the form
});
});