如何使用 jQuery 将 div css 的可见性更改为可见

Question

I have NEXT and PREVIOUS buttons on my screen. When the page initially loads I want the Previous button to be hidden and as soon as user clicks the Next button I want Previous button (div tag to be visible). I have a CSS property for Previous button where I am setting the visibility value to False. And also an if statement where I check to see if page counter is greater than 1 then change the visibility of navigationButtonTop to true. It is not working..what am I doing wrong !?

 $(function() { $("#navigationButtonTop").css("visibility", "visible"); });

 div.navigationButtonTop { visibility: hidden; height: 100px; width: 100px; background-color:blue; }

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <div class="navigationButtonTop"></div>

Answer 1

firstly you have not closed your if statement and navigationButtonTop is a class not a id try this.

if (that.get("pageCounter") >= 1) {
     $(".navigationButtonTop").css("visibility", "visible");
}

as the OP has edited his question the new answer would be:

$(function() {
  $(".navigationButtonTop").css("visibility", "visible");
});

Answer 2

First of all, the code of how you actually like to trigger the event, would be nice to know. Maybe the trigger is not working at all?

Additionaly you addressed differently. In CSS navigationButtonTop is a class (see the ".") and in JS it's an id (see the "#"). Is this the culprit in your atual code? If not I'll assume it's an id further...

For more readability try to move your visibility: hidden to an extra hidden class. So you just can trigger:

$("#navigationButtonBottom").on('click', function() {
  $("#navigationButtonTop").removeClass('hidden');
});

And in you HTML add the class hidden to your button

#navigationButtonTop.hidden { visibility:hidden; }

Or do it using javascript:

jQuery(document).ready( function($) {
  $("#navigationButtonTop").addClass('hidden');
})

Answer 3

In your JS you use ID ("#" sign before selector's name). But in your CSS you use CLASS (dot sign before selector's name).

Try to use "#" in both cases (or dot accordingly).

Answer 4

你试过 $("#navigationButtonTop").show();

Answer 5

Here a good jQuery plugin that saved me in a Materialize's collapsible customization, to avoid the use of a click event replaced with this visibilityChanged event.

In particular, the used code (among the various alternatives described in the plugin page) has been:

HTML

<li id="collapsible_trigger">
    <div class="collapsible-header"></div>
    <div class="collapsible-body"></div>
</li>

<script type="text/javascript" charset="utf-8" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script type="text/javascript" charset="utf-8" src="hideshow.min.js"></script>

JS

$("#collapsible_trigger .collapsible-body").hideShow();
$("#collapsible_trigger .collapsible-body").on("visibilityChanged", function(event, visibility){
    /* your custom code here */
});