使用jQuery切换Div的宽度

Question

I want to toggle the width of a div using a button. I'm not sure how to properly use an if-else statement to check the CSS, and I'm also not clear on the syntax.

Let's assume that I have the following:

CSS

.firstDiv {
    border:1px solid black;
    padding:10px;
    width: 80px;
    margin:5px;
    display:relative;
}

HTML

<button id="boxToggle">Change Width</button>
<div class="firstDiv">
    <p>This is a paragraph.</p>
</div>

JavaScript

$("#boxToggle").click(function () {
    $("#firstDiv").css("width", "120px");
});

Right now, the JavaScript would only change the width once and not go back, but this still isn't working and I'm assuming that my syntax is wrong.

A JSFiddle of the above can be found at the link.

https://jsfiddle.net/647ye1pk/

Any help is appreciated.

Answer 1

You can use toggleClass to achieve this effect

 //I need an "if-else" statement in here, but I'm not sure how to use css as a condition $("#boxToggle").click(function () { $(".firstDiv").toggleClass('largeWidth'); }); 

 .firstDiv { border:1px solid black; padding:10px; width: 80px; margin:5px; display:relative; } .largeWidth{ width:120px; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script> <button id="boxToggle">Change Width</button> <div class="firstDiv"> <p>This is a paragraph.</p> </div> 

And if you don't want to use the toggleClass method try this

 //I need an "if-else" statement in here, but I'm not sure how to use css as a condition click = 0; $("#boxToggle").click(function () { if (click == 0) { $(".firstDiv").css("width", "120px"); click = 1; } else { $(".firstDiv").css("width", "80px"); click = 0; } }); 

 .firstDiv { border:1px solid black; padding:10px; width: 80px; margin:5px; display:relative; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script> <button id="boxToggle">Change Width</button> <div class="firstDiv"> <p>This is a paragraph.</p> </div> 

Answer 2

firstDiv is a class not an id (# vs .) try:

$("#boxToggle").click(function () {
    $(".firstDiv").css("width", "120px");
});

Answer 3

It can be as simple as detecting the width your div has when you click the button, and reacting appropriately:

 $("#boxToggle").click(function() { var fd = $("#firstDiv"); if(fd.css("width")!=="120px") fd.css("width", "120px"); else fd.css("width", "80px"); }); 

 #firstDiv { border: 1px solid black; padding: 10px; width: 80px; margin: 5px; display: relative; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <button id="boxToggle">Change Width</button> <div id="firstDiv"> <p>This is a paragraph.</p> </div> 

Through this you do not need to use global variables and toggle functions.

Answer 4

you can use this

$("#boxToggle").click(function () {
    var width=$(".firstDiv").css( "width" );
    if (width=="80px") 
    {
        $(".firstDiv").css("width","120px");
    }
    else
    {
        $(".firstDiv").css("width","80");
    }