I have a page where I need to filter certain values provided by an embedded widget based on user input in a text field.
I can do this by appending certain parameters to the widget code embedded on the page and refresh the page
How do I take the user input , replace the widget code and refresh the page?
this is the code I might need to append to the widget code that already exist on my page.
%22filter%22:%7B%22keyword%22:%22userprovidedvalue%22%7D,
I am using jsp
You should be able to handle it by putting an onchange on the input field, and sending it to a function that reads the value off of the input field. Alternately, you can have the submit button call a function, that first reads the value off the input field, then performs whatever logic you need, then submits the form.
Jquery is often useful for making things like this easier and more intuitive, though it does have a bit of a learning curve to ramp up.
Related
When purchasing a course, the user can enter 1 or more students to register for the course. By default there is only one entry but the user can use a dropdown to select more and then the form will update to show more.
I am accomplishing this by triggering an event when the user changes the dropdown value that uses ajax to call an action which returns a partial with the appropriate number of entries and then I just replace the existing div with the new one.
My question is whether there is a way to implement this so that it's kind of like "refreshing" the page where the form remembers and automatically refills in he values the user already entered just like if you were to refresh the entire webpage. Is there a way to do this, or will I need to pass in the existing values into the action in my ajax call and have the partial set them?
A secondary question I just thought of (and perhaps this should be in another post but I will go ahead and put it here for now) is whether I should be concerned about any weird behavior with validation when doing it this way? (I'm using stock, built in validation with annotations).
I am currently trying to solve a problem on my Wordpress website. I do not have any code just yet (as I have re-written 4 different forms before I gave up), so I will just state what I want to do, I am pretty sure it's quite simple and I'm just missing something.
I need to build a form on the front-end that works like this: user inputs some value, chooses some other value from dropdown, than clicks on the submit button, page does NOT reload, instead a value is calculated and shown (I know how to show a value after click using jQuery), BUT the value that will be shown is calculated using not only form inputs and hardcoded variables, but also Wordpress custom field values using PHP function get_field().
The problem is that if I use ajax to get values from the form without reloading the page, those values are in javascript and I need to use them with PHP get_field() function.
So, to repeat what I intend to do, so It's easier to understand more quickly:
Form where user inputs some values
User clicks submit
The page does not reload
New value is calculated based on user input and custom field value (using get_field())
New DIV is shown using JQuery on submit click (I know how to do this one, but its important because this is the reason why the page must not be reloaded).
If you could just point me in the right direction, I will be able to code everything else.
Why not just inject the custom fields inside javascript variables when building the page template in php? Then you would have all the data available in javascript when the page loads. Something like this:
<?php
echo '
<script type="text/javascript">
var custom_field_1 = '.json_encode(get_field('custom_field_1')).';
var custom_field_2 = '.json_encode(get_field('custom_field_2')).';
</script>
';
?>
I'm trying to do something with jQuery or just JavaScript (either way works). I need to check if a certain form input field is untouched AND has a value.
Essentially what's going on is that, from a previous page, a user fills out a small form... they are redirected to the full version of the form with said information pre-filled. To reduce hassle, I would like to make it so that as the user fills out the form, it skips the pre-filled input fields. I need to do this in a non-blocking away, so if a user actually clicks on a pre-filled input field to change the value, it won't just skip again.
Is this even possible?
Edit: In this context, when I say "skip", I mean as in to move onto the next form field in the form, if there is any left.
I don't know what you mean by "skip". But you can add an event listener for the change event of the inputs and then set a class/data-attribute or store the information as a js property, so you can test for this value and treat inputs differently if they have been touched.
I'm working on an input form, and I have a Javascript function that gets all of the field values when you press a button. I am looking for a way to automatically refresh the Javascript values (so I can, for example, check if a username is too short on a registration page as they type, and also check if the username is available). Would this be possible?
To clarify, I have an HTML input field (for text), and as the user is typing a result, automatically update.
I'm also open to using PHP or jQuery if it's not possible using solely Javascript, but I'd prefer Javascript if it's possible. Also, sorry if this is a rather basic question, but I've searched and searched and can't find anything on it. I know it's possible because I've seen it on websites (in fact, even on this one, as you type a question, it updates the preview at the bottom).
You should use JQuery Validation Plugin to reduce the heavy checking.
Check this one out at http://jquery.bassistance.de/validate/demo/
No jQuery needed
<input type="text" onKeyUp="validate(this.value);">
function validate(value){
//validate code on value
}
You should monitor onkeyup event
<input type="text" id="test">
$('#test').on('keyup', function() { //this function is triggered every time the user releases a key while typing inside the text field above
//do whatever you want here
});
I'm building an App that is heavy on jQuery. Most of it I can handle without the use of JS and still have a functioning site, however there is one bit that is eluding me. (note, I'm using ASP.NET MVC but that shouldn't matter in this instance)
I have an input field that is making great use of jQuery-UI AutoComplete. The behavior is very simple. The user is asked to input their City, but is given an AutoComplete list of valid cities. If the city is invalid, the server side validation fires and tells them to try again.
If they do select a valid city, the jQuery method updates a hidden field that contains the CityID of the selected city. This is working phenomenally well, and I really like the performance.
Here's where the problem enters. If JS is not available in the browser, the ID field is not updated, and hence the DB is not updated. I am not using the AutoComplete input on the server side at all, just the ID field. What would be a good solution to circumvent this issue?
Default to a select element containing the cities as options and id's as values, and change it to the autocomplete field with the script on page load.
If for some reason sje397's answer doesn't work for you (it's an elegant solution, unless the city auto-select is based on some other field on-screen, such as a zip code or state), simply POST both fields. When evaluating the POSTed data, if the CITY text box has data, and the hidden field does not, then evaluate the entered city using the same validation method used by the jquery callback. If the hidden field has data, you assume that javascript is enabled and use your current logic.
Several options:
1 - Serve HTML initially that shows the "hidden" input, and doesn't include the "autocomplete" one. When JS loads, have a function edit the DOM to your current situation.
2 - Have the form default to send the "autocomplete" data to the server. Use javascript to edit the "send" function to have it switch to the "hidden" input.
Get the page to by default to send the input of the user over the intertubes to your server, if javascript is enabled, change it so it only sends the ID over instead (using javascript obviously).