jquery function fires on declaration

Posted on 2014-10-25
Last Modified: 2014-10-26
This runs out of my "page initialized" function

function SetUpJQSliderElements() {

    var $SizeSlider = $("#SizeSlider").slider({
        min: .5,
        max: 2,
        step: .25,
        animate: "slow",

    $SizeSlider.on("slidechange", function () {
    var SizeFactorDisplay = $("#SizeFactorDisplay")

Open in new window

How might I specify the SizeSlider.on function (SizeFactorChange) so that it does not execute at the time of declaration?
Question by:codequest
LVL 25

Accepted Solution

Kyle Hamilton earned 500 total points
ID: 40404810
A function declaration defines a function. What you have are two function calls (not declarations), the first one of which is an event listener:

$SizeSlider.on()  <-- function call. The on function has an event listener built into it.

.on(event, callback) <-- arguments: the event, and the callback. The callback function will will be executed when the event happens

On line 11, you have a function which listens for the "slidechange" event. Every time this event happens, the callback function will be executed. In the callback you have a function call to the SizeFactorChange function. This will execute the SizeFactorChange function.

What is the issue, and what do you  want to happen?

If you don't want it to execute, remove it.

Author Comment

ID: 40405139
Thanks, that jogged me into understanding better what was needed:

function SetUpJQSliderElements() {

    var $MapSizeSlider = $("#MapSizeSlider").slider({
        min: .5,
        max: 2,
        step: .25,
        animate: "slow",
        value: .75,
        change: MapSizeFactorChange

    //$MapSizeSlider.on("slidechange", function () {
    //    MapSizeFactorChange()
    var MapSizeFactorDisplay = $("#MapSizeFactorDisplay")

Open in new window


Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I have answered several questions lately that were solved utilizing the power of jQuery's AJAX functions, so I thought I would write an article demonstrating the ease of use. Why should I use jQuery as opposed to regular JavaScript? Now I know…
There are a couple ways to attach a JavaScript function to dynamically created elements. You can make a new script for each element as it’s created or you can use delegation. Delegation allows a single script that is added at page creation to mat…
The viewer will learn how to dynamically set the form action using jQuery.
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)

911 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

23 Experts available now in Live!

Get 1:1 Help Now