I wand to call a jquery click function using JavaScript
<input type='button' class="button" value='+Add' id='addImage'>
when i click this button the following function will run
$("#addImage").click(function () {
//my code.....
}
but i need to call this function using another JavaScript function like fn_name()
You can use trigger and the name of the event, like so (the example below uses a self-executing function for simplicity):
$("#addImage").click(function() {
alert('Clicked')
});
(function(){
$("#addImage").trigger('click')
})();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type='button' class="button" value='+Add' id='addImage'>
use trigger
$("#addImage").trigger("click")
you have this ugly way too, but not recommended:
https://jsfiddle.net/96oxhwsf/
function fn_name() {
$("#addImage").click(function() {
alert('test')
});
}
fn_name()
beatiful way:
function fn_name(elID) {
let btn = document.getElementById(elID);
btn.addEventListener('click', function() {
alert('Test');
}, false)
}
// still need call the function
fn_name('addImage');
even better:
var addImg = () => {
let btnAdd = document.getElementById('addImage')
btnAdd.addEventListener('click', () => {
alert('test')
}, false)
}
declare function
bind click event
call function
//declare
function test(){
//my code.....
}
function callTest(){
// call function
test();
}
function callAClick(){
//trigger
$("#addImage").trigger('click')
}
// bind click
$("#addImage").click(test);
Related
I added a simple function:
$.postAndVerify = function(url)
{
// this.event. ?
}
$('#myButton').click(function() {
$.postAndVerify('/url');
});
inside in it, how do I know the caller object, i.e. #myButton? Of course I know it could be just passed:
$.postAndVerify = function(url, $triggeredBy)
{
}
$('#myButton').click(function() {
$.postAndVerify('/url', $(this));
});
but it then would result tons of boilerplate code.
You could make it a plugin method by assigning the method to $.fn instead of to $
$.fn.postAndVerify = function(url){
console.log(this)// jQuery object
}
$('#myButton').click(function() {
$(this).postAndVerify('/url' );
});
Or you could use Function#bind()
You can try to use call method to pass button element as this
$.postAndVerify = function (url) {
console.log('this:');
console.log(this);
};
$('#myButton').click(function () {
$.postAndVerify.call(this, '/url');
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button id="myButton" type="button">Click me</button>
I have a code like this:
function myfunc () {
alert('executed');
}
$('.classname').on('click' function () {
myfunc();
});
I want to run myfunc once. I mean I don't want to execute it every time when user clicks on .classname element. I guess I need to warp function-calling into a condition. Something like this:
if ( /* that function never executed so far */ ) {
myfunc();
}
How can I do that?
The simplest way with jQuery is to use .one
function myfunc() {
alert('executed');
}
$('.classname').one('click', function() {
myfunc();
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button class="classname">click here!</button>
You should remove the event listener in the function you're calling:
function myfunc () {
alert('executed');
$('.classname').off('click', myfunc);
}
$('.classname').on('click', myfunc);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class='classname'>Click Me</div>
Don't set a global variable like the other posts describe - there's no need for that and then you're still doing an unnecessary function call. This ensures the function is never called again and the event isn't being listed for.
$( document ).ready(function() {
var hasBeenExecuted = false;
function myfunc () {
alert('executed');
hasBeenExecuted = true;
}
$('.classname').on('click' function () {
if(!hasBeenExecuted){
myfunc();
}
});
});
var functionWasRun = false;
function myfunc () {
functionWasRun = true;
alert('executed');
}
$(document).ready(function() {
$('.classname').on('click', function () {
if (!functionWasRun) {
myfunc();
}
});
});
I would suggest, as an alternative to a global variable, assigning a property to the function.
function myfunc () {
alert('executed');
myfunc.executed = true;
}
$('.classname').on('click', function () {
if(!myfunc.executed) {
myfunc();
}
});
This has the advantage of working the same way while not polluting the global scope unnecessarily. However, if skyline3000's answer works for you, you should use that instead as it's cleaner and more sensible overall.
Please, help fix bug: the code currently alerts undefined instead of button's inner contents
function registerClickHandler() {
$('#clickme').click(function() {
setTimeout(function() {
alert(this.innerHTML);
}, 200);
});
}
this inside the timeout handler is not the button
function registerClickHandler() {
$('#clickme').click(function (e) {
setTimeout(function () {
alert(e.currentTarget.innerHTML);
}, 200);
});
}
Try to get the value before setTimeout
function registerClickHandler() {
$('#clickme').click(function () {
var value=this.innerHTML;
setTimeout(function () {
alert(value);
}, 200);
});
}
In java script this points to the last function and inside the timeout handler is not the button, thats why you are getting the error.
Also it's a good practice implement this kind of functions or onclicks using on.('click', function(){...})
below you can see my example:
$(document).ready(function(){
$('#clickme').on('click', function (e) {
setTimeout(function() {
alert(e.currentTarget.innerHTML);
}, 200);
});
});
You can take a look and run it here: http://jsfiddle.net/gon250/6qwk0g1t/1/
Try putting the click eventhandler outside the function. Also pass the value of 'this' to a variable before calling setTimout. Later use this variable inside setTimout. Read more about Javascrpt prototypes here
$(document).ready(function(){
$('#clickme').click(function() {
var me = this;
setTimeout(function() {
alert(me.innerHTML);
}, 200);
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="clickme">click me</div>
I want my jquery to load a function when a button is clicked.
This works fine:
$(document).ready(function() {
$("#register").click(function() {
alert("button");
});
This one will show the test() function before the document loads:
$(document).ready(function() {
function test(param1, param2){
alert("param1: "+param1+" param2: "+param2);
}
$("#register").click(test("a","b"));
});
How can i fix this ?
$(document).ready(function() {
$("#register").click(function() {
alert("button
});
should be:
$(document).ready(function () {
$("#register").click(function () {
alert("button");
});
});
And
$(document).ready(function() {
function test(param1, param2){
alert("param1: "+param1+" param2: "+param2);
}
$("#register").click(test("a","b"));
});
should be
$(document).ready(function () {
function test(param1, param2) {
alert("param1: " + param1 + " param2: " + param2);
}
$("#register").click(function () {
test("a", "b");
});
});
$(document).ready() fires once the DOM is ready.
I think your problem is in this code:
$("#register").click(test("a","b")); // I suppose it is executing test().
you just pass the parameters through event handler like this.t allows you to pass a data map to the event object that automatically gets fed back to the event handler function by jQuery as the first parameter. The data map would be handed to the .click() function as the first parameter, followed by the event handler function.
$(document).ready(function() {
function test(e){
alert(e.data.param1); // returns "a"
alert(e.data.param2); // returns "b"
}
$("#register").click({param1 : "a" , param2 : "b"} , test);
});
More you want about event Handler Stack Overflow
The problem is in your click event handler. This is what you have:
$("#register").click(test("a","b"));
Here you are immediately executing the test("a","b") function. Instead you want to pass in a function that calls this. Therefore the corrected code is
$("#register").click(function (){
test("a","b");
});
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/