Passing the elements event using jQuery? - javascript

I am trying to pass the elements "event" into a JavaScript function click using jQuery.
INLINE:
This is easy when doing it directly (inline).
Click Me
USING JQUERY:
But how do you do it using jQuery?
<script type="text/javascript">
<!--
function ToggleMinimize(title, e)
{
// ...various execution code would be here ... //
}
jQuery(window).load(function() {
// How do I "get at" the "event" object for the element & pass it into the function definition?
jQuery(".chatDialog-toggle-button").bind('click', ToggleMinimize);
})
-->
</script>
Thanking you ahead of time!

Following on from what a lot of the other guys have shown regarding passing data to an event function, there is a specific method for this, you can pass a full object map this way per bind.
Also bare in mind that jQuery normalises the event object before you receive it, so it is a little different, see: http://api.jquery.com/category/events/event-object/
function ToggleMinimize(e) {
// ...various execution code would be here ... //
// e.data contains the data object map
// e.data.msg == "Hello World"
}
jQuery(window).load(function() {
jQuery(".chatDialog-toggle-button").bind('click', {'msg': "Hello World"}, ToggleMinimize);
});

You don't have to, it's already the first agument, like this:
function ToggleMinimize(e) {
// ...various execution code would be here ... //
}
jQuery(window).load(function() {
jQuery(".chatDialog-toggle-button").bind('click', ToggleMinimize);
});
If you want to also pass a title, then use an anonymous function, like this:
function ToggleMinimize(title, e) {
// ...various execution code would be here ... //
}
jQuery(window).load(function() {
jQuery(".chatDialog-toggle-button").click(function(e) {
ToggleMinimize("some title", e);
});
});
Personally I'd use a data attribute, like this:
Click Me
Then access it like this:
function ToggleMinimize(e) {
var title = jQuery(this).data("title");
}
jQuery(window).load(function() {
jQuery(".chatDialog-toggle-button").click(ToggleMinimize);
});

You can send an anonymous function which executs ToggleMinimize():
jQuery(window).load(function() {
jQuery(".chatDialog-toggle-button").bind('click', function(e) {
ToggleMinimize( "Hello World", e);
});
})
or you can have ToggleMinimize return a function, so you can pass Hello World into it.
function ToggleMinimize(title) {
return function(e){ alert(title); alert(e.target); }
}
jQuery(window).load(function() {
jQuery(".chatDialog-toggle-button").bind('click', ToggleMinimize( "Hello World") );
})

You can do it this way:
$(document).ready(function() {
$('.chatDialog-toggle-button').bind('click', function(event) {
ToggleMinimize(event);
});
});

Related

How can I read ".on()" method arguments in jQuery?

I have no idea how to bite this problem. Below two examples are working great but I want to avoid the DRY problem.
parentElement.on('focusout', '.foo-class', function () {
// console.log('hello foo')
});
and:
parentElement.on('focusout', '.bar-class', function () {
// console.log('hello bar')
});
I would like to make it more universal. I have to deal with two classes while the parent stays the same.
Assuming that this is the first step:
parentElement.on('focusout', classValue, function () {
// How to display this class so I can call different stuff depending on the class value?
// console.log('hello ' + classValue)
});
May be something along these line, refined from guardio's solution.
Fiddle: https://jsfiddle.net/pvorhknv/2/
What it doing here is to get the element been called for the handler and accessing the attributes. You can use this element "this" for any such use.
$(document).on('focusout', 'input', callme);
function callme(){
console.log('hello ' + $(this).attr('class').split('-')[0])
}
UPDATE:
One other thing you can use it to mark data attribute for the elements.
Fiddle: https://jsfiddle.net/pvorhknv/3/
<input type='text' class='foo-class' data-classname="foo">
<input type='text' class='bar-class' data-classname="bar">
And hence you can access them,
function callme(){
console.log('hello ' + $(this).data('classname'));
}
To look if the (1) element has a particular class, and to (2) get all classes of $(this), see following:
parentElement.on('focusout', classValue, function () {
// (1). find out if element has class 'foo-class'
if $(this).hasClass('foo-class'){
// ...
}
// (2). for each class of element do something
$($(this).attr('class').split(' ')).each(function() {
if (this !== '') {
// ...
}
});
)};
You can use data attribute for specify event which you want to run. My solution is below (simple nothing more nothing less):
html
<div class="event" data-color-event="blue">click me = blue</div>
js
// one listener
$('body').on('click', '.event', function() {
var ev = $(this).data('color-event');
$('body')[ev]();
});
// event functions on demand
$.fn.blue = function() {
alert('blue');
}
$.fn.red = function() {
alert('red');
}
JSFIDDLE DEMO
Separate your classes with commas, and then check the class in the callback.
https://jsfiddle.net/guanzo/dmpgxxt0/
$('.container').on('click','.test1,.test2',function(){
console.log($(this).attr('class'))
})
Did you try
parentElement.on('focusout', '.foo-class, .bar-class', function () {
// console.log('hello foo')
});
And more:
parentElement
.on('focusout', '.foo-class, .bar-class', function () {
// console.log('hello foo')
})
.on('click', '.baz-class', function() { alert('xx'); })
;

how to pass parameter in jquery using .on?

Good Day, this maybe a silly question :) how can I pass a parameter to an external javascript function using .on ?
view:
<script>
var attachedPo = 0;
$this.ready(function(){
$('.chckboxPo').on('ifChecked', addPoToBill(attachedPo));
$('.chckboxPo').on('ifUnchecked', removePoToBill(attachedPo ));
});
</script>
external script:
function addPoToBill(attachedPo){
attachedPo++;
}
function removePoToBill(attachedPo){
attachedPo--;
}
but Im getting an error! thanks for guiding :)
You need to wrap your handlers in anonymous functions:
$('.chckboxPo')
.on('ifChecked', function() {
addPoToBill(attachedPo);
})
.on('ifUnchecked', function() {
removePoToBill(attachedPo);
});
You can also chain the calls to on as they are being attached to the same element.
If your intention is to count how many boxes are checked, via passing variable indirectly to functions try using an object instead like this:
JSFiddle: http://jsfiddle.net/TrueBlueAussie/pBkhX/
var attachedPo = {
count: 0
};
$(function () {
$('.chckboxPo')
.on('change', function () {
if ($(this).is(':checked')) {
addPoToBill(attachedPo);
} else {
removePoToBill(attachedPo);
}
$("#output").prepend("" + attachedPo.count + "<br/>");
});
});
function addPoToBill(attachedPo) {
attachedPo.count++;
}
function removePoToBill(attachedPo) {
attachedPo.count--;
}
If it is not doing anything else you can simplify the whole thing to count checked checkboxes:
$(function () {
var attachedPo = 0;
$('.chckboxPo')
.on('change', function () {
attachedPo = $(".chckboxPo:checked").length;
});
});
"DOM Ready" events:
you also needed to wrap it in a ready handler like this instead of what you have now:
$(function(){
...
});
*Note: $(function(){YOUR CODE HERE}); is just a shortcut for $(document).ready(function(){YOUR CODE HERE});
You can also do the "safer version" (that ensures a locally scoped $) like this:
jQuery(function($){
...
});
This works because jQuery passes a reference to itself through as the first parameter when your "on load" anonymous function is called.
There are other variations to avoid conflicts with other libraries (not very common as most modern libs know to leave $ to jQuery nowadays). Just look up jQuery.noConflict to find out more.

Calling a function (ex. namespace.show) by name

I want to call a function with a namespace based on its name.
Perhaps some background: What I want is, dynamically bind pages via $.mobile.loadPage(inStrUrl, { showLoadMsg: false }); and then, based on the current page, invoke a function within a loaded page. For example: each page has a showFilter function, the Event is attached to a main.html - page which should call the matching function in the current page.
I also tried some solutions, with jquery too, but nothing works for me.
This is my function code:
function namespace() { }
namespace.showFilter = function () {
alert("Test");
}
And want to "invoke" or "call" it via its name.
This is what i tried at least.
$(document).ready(function() {
var fn = window["namespace.showFilter"];
fn();
});
I get error TypeError: fn is not a function
Here is a fiddle http://jsfiddle.net/xBCes/1/
You can call it in the following way:
$(document).ready(function() {
window["namespace"]["showFilter"]();
});
or
$(document).ready(function() {
window["namespace"].showFilter();
});
or
$(document).ready(function() {
window.namespace.showFilter();
});
I found that I had to manually set it to window.
window.namespace = function() { }
window.namespace.showFilter = function () {
alert("Test");
};
$(document).ready(function() {
var fn = window["namespace"]["showFilter"];
fn();
});
http://jsfiddle.net/xBCes/4/
Like this:
$(function() {
window.namespace.showFilter();
});
P.S. I shortened the $(document).ready(...)
function namespace() {}
namespace.showFilter = function () {
alert("Test");
}
$(document).ready(function() {
var fn = namespace.showFilter();
fn();
});
http://jsfiddle.net/xBCes/3/

How to call javascript function with parameter in jquery event handler?

I am stuck. Searched and tried for hours.
EDIT:
I still can't make it work. Okay, I'll just put the source code to make it clear what I want to accomplish.
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script>
<script type="text/javascript">
var date_fmt="yyyy-mm-dd";
var time_fmt="HH:MM";
var date_field="#id_start_0, #id_end_0"; //id refering to html input type='text'
var time_field="#id_start_1, #id_end_1"; //id refereing to html input type='text'
function clearFmt(fmt_type)
{
if($(this).val() == fmt_type) {
$(this).val("");
}
}
function putFmt(fmt_type)
{
if($(this).val() == "") {
$(this).val(fmt_type);
}
}
$(document).ready(function() {
$(date_field).attr("title",date_fmt);
$(time_field).attr("title",time_fmt);
$(date_field).click(function() {
clearFmt(date_fmt);
});
$(date_field).blur(function(){
putFmt(date_fmt);
});
$(time_field).click(function(){
clearFmt(time_fmt);
});
$(time_field).blur(function(){
putFmt(time_fmt);
});
});
</script>
Help ?
Use the jquery bind method:
function myfunc(param) {
alert(param.data.key);
}
$(document).ready( function() {
$("#foo").bind('click', { key: 'value' }, myfunc);
});
Also see my jsfiddle.
=== UPDATE ===
since jquery 1.4.3 you also can use:
function myfunc(param) {
alert(param.data.key);
}
$(document).ready( function() {
$("#foo").click({ key: 'value' }, myfunc);
});
Also see my second jsfiddle.
=== UPDATE 2 ===
Each function has his own this. After calling clearFmt in this function this is no longer the clicked element. I have two similar solutions:
In your functions add a parameter called e.g. element and replace $(this) with element.
function clearFmt(element, fmt_type) {
if (element.val() == fmt_type) {
element.val("");
}
}
Calling the function you have to add the parameter $(this).
$(date_field).click(function() {
clearFmt($(this), date_fmt);
});
Also see my third jsfiddle.
-=-
An alternative:
function clearFmt(o) {
if ($(o.currentTarget).val() == o.data.fmt_type) {
$(o.currentTarget).val("");
}
}
$(date_field).click({fmt_type: date_fmt}, clearFmt);
Also see my fourth jsfiddle.
The following should work as seen in this live demo:
function myfunc(bar) {
alert(bar);
}
$(function() {
$("#foo").click( function() {
myfunc("value");
});
});
anyFunctionName = (function()
{
function yourFunctionName1()
{
//your code here
}
function yourFunctionName2(parameter1, param2)
{
//your code here
}
return
{
yourFunctionName1:yourFunctionName1,
yourFunctionName2:yourFunctionName2
}
})();
$document.ready(function()
{
anyFunctionName.yourFunctionName1();
anyFunctionName.yourFunctionName2();
});
Note: if you don't use 'anyFuctionName' to declare any function then no need return method. just write your function simply like, yourFunctionName1().
in $document.ready section parameter is not issue. you just put your function name here. if you use 'anyFuctionName' function then you have to follow above format.
function myfunc(e) {
alert(e.data.bar); //this is set to "value"
}
$("#foo").click({bar: "value"}, myfunc);
People are making this complicated, simply call directly as you would in Javascript
myfunc("value");

Using Jquery calling different functions with a singe link

I would like to use single a href link to call different functions .
On first click it should call first_function() and on second click it should call second_function. Like toggling between two functions using same link. Suggest the best way to be done.
Jquery Code :
$(function() {
var IntervalId;
function first_function() {
//code goes here
};
function second_function(){
//code goes here
}
$("#link2").click((function(){
second_function();
}));
$("#link1").click((function(){
first_function();
}));
});
Html Code :
Call function2
Call function1
"Like toggling between two functions using same link."
$("#link1").toggle(
function first_function() {
// Code goes here
},
function second_function(){
// Code goes here
}
);
From the jQuery docs on toggle(fn1, fn2, [fn3, [fn4, [...]]]):
Toggle among two or more function calls every other click.
Javascript:
$(document).ready(function() {
function first_function() {
// Code goes here
};
function second_function(){
// Code goes here
}
$("#link").toggle(first_function, second_function);
});
HTML:
<!-- I'm pretty sure that <a> isn't the right tag for this. -->
<button id="link">Toggle between the two functions.</button>
the easiest way would be
var performFirstAction = true;
$(function() {
function first_function() {
// Code goes here
}
function second_function(){
// Code goes here
}
$("#link1").click(function(){
if(performFirstAction) {
first_function(); performFirstAction = false; }
else {
second_function(); performFirstAction = true; }
});
});
or using toggle as Tomalak mention and well,
$(function() {
function first_function() {
// Code goes here
}
function second_function(){
// Code goes here
}
$("#link1").toggle(
first_function,
second_function
);
});

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