I am sure this is so easy and I'm just a huge huge noob. I have a form on a PHP page, and it has a few normal form elements (1 textarea, 1 text field).
I am also dynamically adding 100 small images to the page, which are random, and I am using JQuery to let someone select or deselect these images:
Here is the html that loops 100 times to display the images:
<div class='avatar'><img class='avatar_image' src='$this_profile_image' name='$thisfriend'></div>
and here is the Jquery:
<script type="text/javascript">
$(document).ready(function() {
$(".avatar_image").click(function() {
$(this).toggleClass("red");
});
});
</script>
What I want to do is, when the form is submitted, have the script that processes it be able to tell which of those 100 images is selected (so it's class will be "red" instead of "avatar_image"). I am blanking on this.
You'll need to add hidden inputs with some kind of identifiers for those images, and toggle the state of those inputs based on the image selected-ness. Something like this:
Change your image markup:
<div class='avatar'>
<img class='avatar_image' src='$this_profile_image' name='$thisfriend'>
<input type="hidden" name="avatar_image[]" value="$this_profile_image" disabled="disabled" />
</div>
Change jQuery binding (and use event delegation, maybe pick a better container than document.body):
<script type="text/javascript">
$(function() {
var selClass = 'red';
$(document.body).on('click', ".avatar_image", function() {
var $this = $(this);
var $inp = $this.siblings('input[type="hidden"]');
var isSelected = $this.hasClass(selClass), willBeSelected = !isSelected;
$this.toggleClass(selClass);
if(willBeSelected) {
$inp.removeAttr('disabled');
} else {
$inp.attr('disabled', 'disabled');
}
});
});
</script>
Read the submitted data in PHP (assuming you're submitting via a POST form):
$selectedImages = $_POST['avatar_image'];
Add a ID to each image, when its clicked grab the id and then inject it into a hidden textfield
<input type="hidden" name="avatar" id="avatar" value="" />
$(".avatar_image").click(function() {
$(this).toggleClass("red");
//assign its id to the hidden field value
$("input[name='avatar']").attr('value', $(this).attr('id'));
// pass that to your DB
});
I presume your using ajax to grab this data back
success : function(callback){
$("image[id*='"+callback.avatar+"']").addClass('red');
}
Try this
PHP: Add the id for the friend to the html you had
<div class='avatar'>
<img class='avatar_image' src='$this_profile_image' name='$thisfriend' data-id='$thisFriendsId>
</div>
JS: Create an empty array. Use each function to go through push the selected id into your array. Then use post to submit to your php.
selected = [];
$(function(){
$(".avatar_image").click(function() {
$(this).toggleClass("red");
});
$('.submit').click(function(){
$('.red').each(function(){
var selectedId = $(this).data('id');
selected.push(selectedId);
});
$.post ('http://mysite.com/process.php', selected, function() { alert('succes!'); });
});
});
Related
I am developping a website with some serious Javascript involved and I have to use generated data from PHP in my JS code.
For example, to be able to use my page ID in JS, I proceed like this:
<input type="hidden" id="pageId" value="<?php echo $page->getId() ?>" />
<button id="runJs">RUN</button>
And in my javascript (with jQuery):
$(function() {
$('#runJs').click(function() {
var id = $('#pageId').val();
});
});
It works, but is there a cleaner way to do it?
Since HTML5, one can now add user-made attributes to any HTML tag as long as it starts with data-.
In HTML5:
<button id="runJs" data-pageId="<?php echo $page->getId() ?>">RUN</button>
In JS:
$(function() {
$('#runJs').click(function() {
var id = $(this).attr('data-pageId');
});
});
Or, as said Eric Martinez in the comments, using jQuery:
var id = $(this).data('pageId');
Passing data this way is cleaner for two reasons:
It is not using a side tag that could be confusing.
The data you pass is included in the button, which means another button with its own data-XXX can use the same JS function, even on the same page.
Example
HTML:
<button data-value="5">Square it!</button>
<button data-value="7">Square it!</button>
<button data-value="12">Square it!</button>
JS:
$(function() {
$('button').click(function() {
var value = $(this).attr('data-value');
alert(value * value); // Shows 25, 49 or 144 depending of the button pressed.
});
});
The function doesn't know the button. The buttons don't even need an ID as long as JS is involved.
You can create variables inside the tag. Like this:
<script>
var pageId = '<?php echo $page->getId(); ?>';
</script>
Later in your script:
$(function() {
$('#runJs').click(function() {
var id = pageId;
});
});
I've got a page in wordpress that displays around 20 poll questions (using WP-polls).
I'm using a snippet to display the submit button for each poll once an answer has been checked. Thing is, with this snippet I have to copy paste it about 20 times, because of that I some kind of loop.
This is the current code I'm using
$(document).ready(function() {
var $submit = $("#btn-7").hide(),
$cbs = $('input[name="poll_7"]').click(function() {
$submit.toggle( $cbs.is(":checked") );
});
});
$(document).ready(function() {
var $submit = $("#btn-6").hide(),
$cbs = $('input[name="poll_6"]').click(function() {
$submit.toggle( $cbs.is(":checked") );
});
});
$(document).ready(function() {
var $submit = $("#btn-5").hide(),
$cbs = $('input[name="poll_5"]').click(function() {
$submit.toggle( $cbs.is(":checked") );
});
});
As you can see what changes is the "btn_number" ID and "poll_number". This goes on for another 20 snippets. How can I make this dynamic?
jQuery allows you to use wildcards, for example:
var $submit = $("#btn-*").hide(),
$cbs = $('input[name="poll_*"]').click(function() {
$submit.toggle( $cbs.is(":checked") );
});
Edit: I see the wildcard selectors isn't supported by jquery anymore (as above example) you might want to look at: http://james.padolsey.com/javascript/regex-selector-for-jquery/ which gives you the ability to use regex to define the selectors for all btn's and code for it once
You can use the starts with selector on the ID and name attributes, to dynamically access the number. The change event is more appropriate than the click event for checkboxes.
Demo
$('[id^="btn-"]').hide();
$('input[name^="poll_"]').change(function(){
var number = this.name.replace('poll_', '');
$('#btn-' + number).toggle( $(this).is(":checked") );
});
It would be better to use data-* attributes to link the buttons and checkboxes, or nest them in an element that has the ID. Parsing the number out of the ID attribute isn't the cleanest way.
You don't have to repeat the same code for 20 times just for getting different button ids. you can make it dynamic. checkout this simple example
$("#submit").click(
function()
{
for(i=1;i<=5;i++)
{
msg = $("#btn-"+i).val()
alert(msg)
}
}
)
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<input type="button" id="btn-1" value="button1">
<input type="button" id="btn-2" value="button2">
<input type="button" id="btn-3" value="button3">
<input type="button" id="btn-4" value="button4">
<input type="button" id="btn-5" value="button5">
<p>
<input type="button" value="submit" id="submit">
$(document).ready(function(){
for(var i=1;i<=20;i++){
var submit = $("#btn-"+i).hide(),
cbs = $('input[name="poll_'+i+'"]').click(function(){
submit.toggle($this.is(":checked"));
});
}
});
I have a function in JavaScript that submits a message to a method in a Grails controller and at the same time updates div with myID id.
function messageKeyPress(field,event,messageBox) {
...
var message = $('#messageBox').val();
<g:remoteFunction action="submitMessage" params="\'message=\'+message" update="myID"/>
...
}
I use it like this:
<div id="chatMessages" class="chatMessages"></div>
<input type="text" id="messageBox" class="messageBox" name="message" onkeypress="messageKeyPress(this,event,'#messageBox');"/>
<div id="myID">
I would like that function to be reusable being able to update different divs.
I tried:
onkeypress="messageKeyPress(this,event,'#messageBox', '#myID');"
and in JavaScript:
function messageKeyPress(field,event,messageBox, myID) {
...
<g:remoteFunction action="submitMessage" params="\'message=\'+message" update="${myID}"/>
But that didn't work. My question is how to pass a JavaScript variable to Grails g:remoteFunction "update" property.
I suggest you to use jQuery instead. It is bundled by default to Grails projects. As a result, you'll get a neat separation between javascript code and gsp view logic. For instance, application.js might look like this:
(function($) {
$('.messageBox').on('keypress', function () {
...
var params = {message: $(this).val()};
var url = $(this).data('url');
var target = $(this).data('target');
$.post(url, params, function(response) {
$(target).html(response);
});
...
});
})(jQuery);
and your view file:
<input type="text" id="messageBox"
class="messageBox" name="message"
data-url="${createLink(action: 'submitMessage')}"
data-target="#myId"/>
<div id="myID"></div>
You should assign a messageBox css class to every input field you want to have this event listener. And in data-target attribute of every field you can specify a selector for all divs that should be updated.
jQuery is very easy to learn. http://api.jquery.com/
The update attribute should be set to the ID of the element to be updated, not a selector that matches this element. In other words, try this:
onkeypress="messageKeyPress(this,event,'#messageBox', 'myID');" // '#' removed from myID
I have an application (drag and drop using JqueryUI.GridSort) that allows the user to upload photos, and then sort the photos in the order that they would like using drag and drop.
On page load, the user is prompted to upload photos which are posted to the next page. When they arrive on the next page my php script creates a <ul id="sortable"> containing <li> for each of the files they uploaded. For each picture that they have uploaded to the site, a new <li> is created. Inside of that <li> is a <img> that sets the picture for <li> with the image they have uploaded.
My goal is to be able to "save" the order of the pictures after they have arranged them in the drag and drop interface. For example, once they have finished arranging and sorting the pictures in the order they want them in, I would like to be able to send them another page that creates an xml file ( I don't need help with the XML, only saving the order) with using the list that they created in the correct order.
After hours of tinkering with PHP, I have come to realization that because PHP is a serverside language, it cannot see what is sorted post render. So my question is, is there a way to have JavaScript or Ajax read the current order of the list, and post it to the next page? If you do know how, could you please provide an example of both the POST from one page, and the post receiving on the other? I am not very familiar with Ajax.
Thank you greatly for any assistance you could provide.
Sample Code (The contents of the foreach statement that creates a LI for each file uploaded)
$imgID++;
echo '<li class="ui-state-default"><img id="'.$imgID.'"'.' src="user_files/'.$file_name.'" draggable="true" height="90" width="95"></li>';
EDIT
main page :
<script>
$('#my_form').on('submit', function() {
var ordered_list = [];
$("#sortable li img").each(function() {
ordered_list.push($(this).attr('id'));
});
$("#ordered_list_data").val(JSON.stringify(ordered_list));
});
</script>
<div id="tesT">
<form id="my_form" action="update_data.php">
<!-- other fields -->
<input type="hidden" id="ordered_list_data"></input>
<input type="submit" value="Proceed to Step 2"></input>
</form>
</div>
update_data.php:
<?php
// process other fields as normal
if(isset($_POST['ordered_list_data'])) {
$img_ordering = json_decode($_POST['ordered_list_data']);
echo "1";
} else {
echo "nodata";
}
// do things with the data
?>
I built a JSFiddle doing basically the same thing that David posted.
I added a piece to write out the result to a div on the page, so you can see what's going on:
<input type="button" id="savebutton" value="save"/>
<div id="output"></div>
<form id="listsaveform" method="POST" action="script.php">
<input type="hidden" name="list" id="hiddenListInput" />
</form>
Javascript:
$(function() {
$( "#sortable" ).sortable();
$( "#sortable" ).disableSelection();
$( "#savebutton" ).click(function() { LISTOBJ.saveList(); });
});
var LISTOBJ = {
saveList: function() {
var listCSV = "";
$( "#sortable li" ).each(function() {
if (listCSV === "") {
listCSV = $(this).text();
} else {
listCSV += "," + $(this).text();
}
});
$("#output").text(listCSV);
$("#hiddenListInput").val(listCSV);
//$("#listsaveform").submit();
}
}
If you're using a <form> you can do something like this (assuming jQuery is being used):
$('#my_form').on('submit', function() {
var ordered_list = [];
$("#sortable li img").each(function() {
ordered_list.push($(this).attr('id'));
});
$("#ordered_list_data").val(JSON.stringify(ordered_list));
});
In essence, what you're doing is looping over the <ul>, fetching each <img> and appending the ids (in order of appearance) to an array. Arrays preserve ordering in JavaScript and JSON, so one can turn it into a JSON string using the JSON.stringify function, set it as the value of a <input type="hidden"> field and then submit the form.
If you want to use AJAX, the functionality is very similar. However, instead of using an onsubmit (or onclick) you'd use $.post.
Let's go with the <form> option since it's simpler. All told you'll have something similar to the above JS along with HTML like this:
<form id="my_form" method="post" action="./update_data.php">
<!-- other fields -->
<input type="hidden" name="ordered_list_data" id="ordered_list_data"></input>
<input type="submit" value="Submit"></input>
</form>
Then, in update_data.php (or whatever your script is named):
<?php
// process other fields as normal
if(isset($_POST['ordered_list_data'])) {
$img_ordering = json_decode($_POST['ordered_list_data']);
} else {
// handle case where there is no data
}
// do things with the data
?>
I'm new to html and im trying to hide/show forms if the user ticks a box a form appears below it.
I have a form e.g.
Name :
Username :
Add More Users: (tickbox)
If the user ticks the 'Add More Users', another form with the fields 'Name,Username,Add More Users' appears below it. How is this possible?
HTML
<input type="checkbox" onclick="display(this)">Add more users</input>
<div id="yourDiv"> ...other forms... </div>
JavaScript
function display(e){
if (e.checked)
document.getElementById('yourDiv').style.display = 'block';
else
document.getElementById('yourDiv').style.display = 'none';
}
An even better way to do this (thanks to What)
HTML
<input id="more" type="checkbox">Add More Users</input>
<div id="yourDiv"> ...other form... </div>
JavaScript
window.onload = function () {
document.getElementById('more').onclick = function () {
if (this.checked)
document.getElementById('yourDiv').style.display = 'block';
else
document.getElementById('yourDiv').style.display = 'none';
}
}
You will need to use scripts for that.
First of all put the form you want to Show/Hide inside a <div id="myForm"> tag
and enclose it with
Then use jQuery http://www.jquery.com (download the jquery library and link it to your page and add an event at the loading of the page to run a function to check if the combo box is checked then execute:
("#myForm").toggle();
You can use .clone() and .append() (requires jQuery). You have give name attribute like
<input type="text" name="test[]" />