Slot Effect Jquery
This paper describes the running effect of the slot machine implemented by jQuery. Share for your reference, as follows:
Running effect of slot machine
Note that you need to refer to the jQuery library yourself
It has 3 empty slots. Sparse2 is created with an array literal with the missing second element. In any of these sparse arrays accessing an empty slot evaluates to undefined. When working with arrays, to avoid undefined, be sure to use valid array indexes and prevent the creation of sparse arrays. Difference between undefined and null. For example, perhaps you want a single method you can call on a jQuery selection that performs a series of operations on the selection. In this case, you may want to write a plugin. Link How jQuery Works 101: jQuery Object Methods. Before we write our own plugins, we must first understand a little about how jQuery works. Take a look at this code.
UseOnline HTML/CSS/JavaScript Code Running ToolHttp://tools.jb51.net/code/HtmlJsRun test run the above code, you can get the following results:
Readers who are interested in jQuery-related content can see the topics of this site: Summary of JQuery Operating DOM Node Method, Summary of jQuery Extension Skills, Summary of jQuery Common Plug-ins and Usages, Summary of jQuery Table Operating Skills, Summary of Ajax Usage in jQuery, Summary of Common Classic Special Effects of jQuery, Summary of jQuery Animation and Special Utilities. And “Summary of jQuery selector usage”
I hope this article will be helpful to everyone’s jQuery program design.
It's not a great idea to use jQuery and Vue.js in the same UI. Don't do it if you can avoid it.
But you're probably reading this not because you want to use jQuery and Vue together, but because you have to. Perhaps a client is insisting on using a particular jQuery plugin that you won't have time to rewrite for Vue.
If you're careful about how you do it, you can use jQuery and Vue together safely. In this article I'm going to demonstrate how to add the jQuery UI Datepicker plugin to a Vue project.
And just to show off a bit, I'm even going to send data between this jQuery plugin and Vue!
See it working in this JS Bin.
jQuery UI Datepicker
The problem with using jQuery and Vue together
Why is doing this potentially hazardous?
Vue is a jealous library in the sense that you must let it completely own the patch of DOM that you give it (defined by what you pass to el). If jQuery makes a change to an element that Vue is managing, say, adds a class to something, Vue won't be aware of the change and is going to go right ahead and overwrite it in the next update cycle.
Solution: use a component as a wrapper
Knowing that Vue and jQuery are never going to share part of the DOM, we have to tell Vue to cordon off an area and give it over to jQuery.
Using a component to wrap a jQuery plugin seems like the way to go because:
- We can utilise lifecycle hooks for setup and teardown of the jQuery code
- We can use the component interface to communicate with the rest of the Vue app via props and events
- Components can opt-out of updates with
v-once
Set up jQuery UI Datepicker
Obviously you need to include both the jQuery and jQuery UI libraries in your project first. Once you have those, the datepicker just requires an input element to attach itself to:
It can then be instantiated by selecting it and calling the method:
Datepicker component
Slot Effect Jquery Examples
To make our datepicker component, the template will be this one input element:
Note: this component should be nothing more than a wrapper for the plugin. Don't push your luck and give it any data properties or use directives or slots.
Instantiating the widget
Rather than giving our input an ID and selecting it, we can use this.$el, as every component can access its own root node like that. The root node will of course be the input.
We can then wrap the node reference in a jQuery selector to access the datepicker method i.e. $(this.$el).datepicker().
Note that we use the mounted lifecycle hook as this.$el is undefined until the component is mounted.
Teardown
To teardown the datepicker we can follow a similar approach and use a lifecycle hook. Note that we must use beforeDestroy to ensure our input is still in the DOM and thus can be selected (it's undefined in the destroy hook).
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Pass config with props
To make our component reusable, it would be nice to allow for custom configuration, like specifying the date format with the configuration property dateFormat. We can do this with props:
Letting jQuery handle updates
Let's say that, rather than passing your dateFormat prop as a string, you made it a data property of your root instance i.e.:
This would mean dateFormat would be a reactive data property. You could update its value at some point in the life of your app:
Since the dateFormat prop is a dependency of the datepicker component's mounted hook, updating it would trigger the component to re-render. This would not be cool. jQuery has already setup your datepicker on the input and is now managing it with it's own custom classes and event listeners. An update of the component would result in the input being replaced and thus jQuery's setup would be instantly reset.
We need to make it so that reactive data can't trigger an update in this component...
v-once
The v-once directive is used to cache a component in the case that it has a lot of static content. This in effect makes the component opt-out from updates.
This is actually perfect to use on our plugin component, as it will effectively make Vue ignore it. This gives us some confidence that jQuery is going to have unhampered control over this element during the lifecycle of the app.
Passing data from jQuery to Vue
It'd be pretty useless to have a datepicker if we couldn't retrieve the picked date and use it somewhere else in the app. Let's make it so that after a value is picked it's printed to the page.
We'll start by giving our root instance a date property:
The datepicker widget has an onSelect callback that is called when a date is picked. We can then use our component to emit this date via a custom event:
Slot Effect Jquery Example
Our root instance can listen to the custom event and receive the new date:
Slot Effect Jquery Download
Thanks to this Stack Overflow answer for inspiration.