First include required JS and CSS files ( could be found in ldCover's Github Repo ). Then, prepare a modal root node, and use it to create an ldcover object:
/* 3. createldcoverobject with the modal node */
var ldcv = new ldcover({ root: "#my-modal" });
Try Me
CLICK TO DISMISS
ldCover is designed with following features:
Vanilla JS
ldCover is implemented with Vanilla JS. There is no single external dependency which makes it easy to maintain and as light as possible - file size only about 6KB in total.
Framework Agnostic
ldCover is independent to any JS libraries or frameworks. Thus, it's quite easy to integrate it into your project regardless which framework you use. It will work on React, Vue, Angular or any JS frameworks.
Promise Based
With promise, you can toggle modals in asynchronous way, e.g., wait for user event, polling for server response... Everything made simple with promise.
Nesting Supported
ldCover automatically manages z-index of your modal which makes it easy and useful working with complicated workflows that might involves multiple dialogs.
While ldCover is framework agnostic, we will use Bootstrap 4 in following examples. Bootstrap is not necessary so you can use your favorite framework.
Basic Dialog
ldCover uses 3-Level DOM structure to define a dialog, with classNames "ldcv", "base", and "inner":
<div class="ldcv"> <!-- root of the dialog -->
<div class="base"> <!-- optional. control the position of dialog -->
<div class="inner"> <!-- dialog body. transition happens here -->
your content here...
</div>
</div>
</div>
Roles of each node are:
ldcv - root element, passed to ldcover constructor. will be full screen in size.
base - wrapping element for dialog that controls its position. optional.
inner - dialog body.
Here is a simple example of dialog with only one line of text:
As shown in previous demo, you can call toggle() to toggle on/off the target dialog. Additionally, you can set the data-ldcv-set attribute of any element inside the root element to transfer that element into a close button:
Value of data-ldcv-set could actually be used to determine how users respond to your dialog. To get users response, toggle dialog with get() instead of toggle(); get() returns a Promise which is resolved with the data-ldcv-set attribute for the clicked element:
var ldcv = new ldcover({root: ".ldcv"});
function prompt() {
ldcv.get().then(function(ret) { alert("User chooses: " + ret); });
}
What's Your Choice?
Yes
No
Show Dialog
Or, if you prefer to handle events by yourself, you can invoke set() to manually set the value for resolving Promise:
<div class="ldcv">
<div class="base">
<div class="inner card">
<div class="card-body">
<h3>Click When You Are Ready</h3>
<hr>
<div class="btn btn-primary" onclick="finish()"> I'm Ready </div>
</div>
</div>
</div>
</div>
<div onclick="prompt()">Show Dialog</div>
var ldcv = new ldcover({root: ".ldcv"});
function prompt() {
var start = Date.now();
ldcv.get().then(function(ret) {
alert("User wait " + (+ret - Date.now()) + " ms to respond.");
});
}
function finish() {
ldcv.set(Date.now());
}
Click When You Are Ready
I'm Ready
Show Dialog
Customization
In following section we'll demonstrate how you can change the ldCover's behavior or even extend it.
Dimension
You can manually adjust size of your dialog by changing style of .inner element, but we also provide 3 CSS class for quickly setting dialog's size:
md: 720px x 500px
lg: 960px x 700px
full: fullscreen
<div class="ldcv">
<div class="base">
<!-- set width and height manually -->
<div class="inner" style="width:600px;height:200px">
...
</div>
</div>
</div>
<!-- use predefined class -->
<div class="ldcv full">
<div class="base">
<div class="inner"> ... </div>
</div>
</div>
Effects on Transition
ldCover is shipped with some prebuilt effects on transition. To use them, include an additional CSS file ldcv.effects.css and add the class for desired effects in the root element. Following are classes for these effects, you can preview the effects by clicking corresponding buttons:
ldcv-scale
Effect Preview
Put "ldcv-scale" in the root element's class will do the trick, for example:
If you don't like the built-in effects, you can also write your own class or use external libraries. To make your own effect, simply define your own class with two states ( with / without active class ), and styling the inner class:
If you want to use CSS Animation instead of CSS Transition to animate your dialog, we also provide the animation attribute that helps you to toggle desired classes when dialog changes it's state; here we use transition.css as an example:
var ldcv = new ldcover({
root: "#my-ldcv",
animation: "ld ld-bounce-in"
});
Custom Animation Rocks!
transition.css is available here. Go visit for more information about how to use it.
Close
CSS Animation grants you more powerful and subtle controls to your dialog animation, and transition.css provides about 40 different prebuilt animations for you to choose. If you are interested in using transition.css, follow this link directly to get more detail about how to use it.
Configurations
Except the configurations described above, you can also alter ldCover's behavior by following configurations:
root: root element for your modal.
type: additional class to add. default: ''. Space seprated.
transform-fix: true/false. default: false.
add a 'shown' class after ldCover is shown, which removes transform from .inner block. useful when content is blurred due to transform, but might lead to glitches when doing transition. use it carefully.
delay: milliseconds. default 300.
should be aligned with transition duration. use to control 'shown' and 'running' classes.
escape: should pressing escape key close the dialog. boolean, default true.
with autoZ, ldCover keeps track of all cover' z-index and always use larger z-index for newly toggled covers. baseZ is then used as a base value for all auto-z covers.
animation: optional space separated class list.
will be added to .inner node when toggling on, and removed when toggling off.
for adding customized animation from libraries like transition.css or animate.css.
APIs
a ldcover instance exposes following API functions:
toggle(state): toggle on/off ldCover.
get(): toggle on ldCover and return a promise
Returned promise will only be resolved when ldcover.set is called, along with the parameters passed into set.
set(value, hide): set value, which resolve promises from get.
hide ldCover if hide = true.
value is passed to the promise from get.
use data-ldcv-set on elements to automatically set value when elements are clicked.
on(event, cb): listen to certain event. evnets:
toggle.on: when ldCover is toggled on.
toggle.off: when ldCover is toggled off.
isOn(): check if this modal is active ( opened ). return true or false.
Browser Compatibility
ldCover is compatible with all modern browsers. However, it uses two modern web features that fails in IE older than version 11:
classList ( not supported by IE<=9 )
Promise ( not supported by IE<=11, Opera Mini, IE Mobile and some older mobile device)
Fortunately you can easily find polyfills for both classList and Promise to support these browsers.
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