How to encode and decode all special characters in javascript or jquery?

Question!

I want to be able to encode and decode all the following characters using javascript or jquery...

[email protected]#$%^&*()_+|}{:"?><,./';[]\=-`

I tried to encode them using this...

var cT = encodeURI(oM); // oM holds the special characters
cT = cT.replace(/[!"#$%&'()*+,.\/:;<=>[email protected][\\\]^`{|}~]/g, "\\\\$&");

Which does encode them, or escape them rather, but then I am trying to do the reverse with this...

decodeURIComponent(data.convo.replace(/\+/g, ' '));

But, it's not coming out in any way desired.

I've built a chat plugin for jquery, but the script crashes if someone enters a special character. I want the special characters to get encoded, then when they get pulled out of the data base, they should be decoded. I tried using urldecode in PHP before the data is returned to the ajax request but it's coming out horribly wrong.

I would think that there exists some function to encode and decode all special characters.

Oh, one caveat for this is that I'm wrapping each message with html elements, so I think the decoding needs to be done server side, before the message is wrapped, or be able to know when to ignore valid html tags and decode the other characters that are just what the user wanted to type.

Am I encoding/escaping them wrong to begin with?

Is that why the results are horrible?



Answers

This is pretty simple in javascript

//Note that i have escaped the " in the string - this means it still gets processed
var exampleInput = "Hello there h4x0r [email protected]#$%^&*()_+|}{:\"?><,./';[]\=-`";
var encodedInput = encodeURI(exampleInput);
var decodedInput = decodeURI(encodedInput);
console.log(exampleInput);
console.log(encodedInput);
console.log(decodedInput);

Just encode and decode the input. If something else is breaking in your script it means you are not stripping away things that you are somehow processing. It's hard to provide an accurate answer as you can see encoding and decoding the URI standards does not crash things. Only the processing of this content improperly would cause issues.

When you output the content in HTML you should be encoding the HTML entities.

Reference this thread Encode html entities in javascript if you need to actually encode for display inside HTML safely.

An additional reference on how html entities work can be found here: W3 Schools - HTML Entities and W3 Schools - HTML Symbols



It looks like this is a known issue with the plugin:

"When I flip it to the back, which is the long sidebar, it doesn't expand the container to fill the sidebar. Instead it just overlaps the content..."

You can follow the status on the github issue page.

Maybe you'd be interested in CSS flip tricks instead? Here is a cool example from David Walsh

/* simple */

.flip-container {
  -webkit-perspective: 1000;
  -moz-perspective: 1000;
  -ms-perspective: 1000;
  perspective: 1000;
  -ms-transform: perspective(1000px);
  -moz-transform: perspective(1000px);
  -moz-transform-style: preserve-3d;
  -ms-transform-style: preserve-3d;
  border: 1px solid #ccc;
}
/*
			.flip-container:hover .flipper, .flip-container.hover .flipper, #flip-toggle.flip .flipper {
				-webkit-transform: rotateY(180deg);
				-moz-transform: rotateY(180deg);
				-ms-transform: rotateY(180deg);
				transform: rotateY(180deg);
				filter: FlipH;
    			-ms-filter: "FlipH";
			}
			*/

/* START: Accommodating for IE */

.flip-container:hover .back,
.flip-container.hover .back {
  -webkit-transform: rotateY(0deg);
  -moz-transform: rotateY(0deg);
  -o-transform: rotateY(0deg);
  -ms-transform: rotateY(0deg);
  transform: rotateY(0deg);
}
.flip-container:hover .front,
.flip-container.hover .front {
  -webkit-transform: rotateY(180deg);
  -moz-transform: rotateY(180deg);
  -o-transform: rotateY(180deg);
  transform: rotateY(180deg);
}
/* END: Accommodating for IE */

.flip-container,
.front,
.back {
  width: 320px;
  height: 427px;
}
.flipper {
  -webkit-transition: 0.6s;
  -webkit-transform-style: preserve-3d;
  -ms-transition: 0.6s;
  -moz-transition: 0.6s;
  -moz-transform: perspective(1000px);
  -moz-transform-style: preserve-3d;
  -ms-transform-style: preserve-3d;
  transition: 0.6s;
  transform-style: preserve-3d;
  position: relative;
}
.front,
.back {
  -webkit-backface-visibility: hidden;
  -moz-backface-visibility: hidden;
  -ms-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-transition: 0.6s;
  -webkit-transform-style: preserve-3d;
  -webkit-transform: rotateY(0deg);
  -moz-transition: 0.6s;
  -moz-transform-style: preserve-3d;
  -moz-transform: rotateY(0deg);
  -o-transition: 0.6s;
  -o-transform-style: preserve-3d;
  -o-transform: rotateY(0deg);
  -ms-transition: 0.6s;
  -ms-transform-style: preserve-3d;
  -ms-transform: rotateY(0deg);
  transition: 0.6s;
  transform-style: preserve-3d;
  transform: rotateY(0deg);
  position: absolute;
  top: 0;
  left: 0;
}
.front {
  -webkit-transform: rotateY(0deg);
  -ms-transform: rotateY(0deg);
  background: lightgreen;
  z-index: 2;
}
.back {
  background: lightblue;
  -webkit-transform: rotateY(-180deg);
  -moz-transform: rotateY(-180deg);
  -o-transform: rotateY(-180deg);
  -ms-transform: rotateY(-180deg);
  transform: rotateY(-180deg);
}
.front .name {
  font-size: 2em;
  display: inline-block;
  background: rgba(33, 33, 33, 0.9);
  color: #f8f8f8;
  font-family: Courier;
  padding: 5px 10px;
  border-radius: 5px;
  bottom: 60px;
  left: 25%;
  position: absolute;
  text-shadow: 0.1em 0.1em 0.05em #333;
  display: none;
  -webkit-transform: rotate(-20deg);
  -moz-transform: rotate(-20deg);
  -ms-transform: rotate(-20deg);
  transform: rotate(-20deg);
}
.back-logo {
  position: absolute;
  top: 40px;
  left: 90px;
  width: 160px;
  height: 117px;
  background: url(logo.png) 0 0 no-repeat;
}
.back-title {
  font-weight: bold;
  color: #00304a;
  position: absolute;
  top: 180px;
  left: 0;
  right: 0;
  text-align: center;
  text-shadow: 0.1em 0.1em 0.05em #acd7e5;
  font-family: Courier;
  font-size: 22px;
}
.back p {
  position: absolute;
  bottom: 40px;
  left: 0;
  right: 0;
  text-align: center;
  padding: 0 20px;
  font-size: 18px;
}
/* vertical */

.vertical.flip-container {
  position: relative;
}
.vertical .back {
  -webkit-transform: rotateX(180deg);
  -moz-transform: rotateX(180deg);
  -ms-transform: rotateX(180deg);
  transform: rotateX(180deg);
}
.vertical.flip-container .flipper {
  -webkit-transform-origin: 100% 213.5px;
  -moz-transform-origin: 100% 213.5px;
  -ms-transform-origin: 100% 213.5px;
  transform-origin: 100% 213.5px;
}
/*
			.vertical.flip-container:hover .flipper {
				-webkit-transform: rotateX(-180deg);
				-moz-transform: rotateX(-180deg);
				-ms-transform: rotateX(-180deg);
				transform: rotateX(-180deg);
			}
			*/

/* START: Accommodating for IE */

.vertical.flip-container:hover .back,
.vertical.flip-container.hover .back {
  -webkit-transform: rotateX(0deg);
  -moz-transform: rotateX(0deg);
  -o-transform: rotateX(0deg);
  -ms-transform: rotateX(0deg);
  transform: rotateX(0deg);
}
.vertical.flip-container:hover .front,
.vertical.flip-container.hover .front {
  -webkit-transform: rotateX(180deg);
  -moz-transform: rotateX(180deg);
  -o-transform: rotateX(180deg);
  transform: rotateX(180deg);
}
/* END: Accommodating for IE */
<p>Mouse over the image below to see it flip!</p>

<h2>Styled Card (Horizontal Flip)</h2>
<div class="flip-container" ontouchstart="this.classList.toggle('hover');">
  <div class="flipper">
    <div class="front" style="background: url(https://davidwalsh.name/demo/dwflip.jpg) 0 0 no-repeat;">
      <span class="name">David Walsh</span>
    </div>
    <div class="back" style="background:#f8f8f8;">
      <div class="back-logo"></div>
      <div class="back-title">@davidwalshblog</div>
      <p>Mozilla Web Developer, MooTools & jQuery Consultant, MooTools Core Developer, Javascript Fanatic, CSS Tinkerer, PHP Hacker, and web lover.</p>
    </div>
  </div>
</div>
<br />
<br />

<h2>Styled Card (Vertical Flip)</h2>
<div class="flip-container vertical" ontouchstart="this.classList.toggle('hover');">
  <div class="flipper">
    <div class="front" style="background: url(https://davidwalsh.name/demo/dwflip.jpg) 0 0 no-repeat;">
      <span class="name">David Walsh</span>
    </div>
    <div class="back" style="background:#f8f8f8;">
      <div class="back-logo"></div>
      <div class="back-title">@davidwalshblog</div>
      <p>Mozilla Web Developer, MooTools & jQuery Consultant, MooTools Core Developer, Javascript Fanatic, CSS Tinkerer, PHP Hacker, and web lover.</p>
    </div>
  </div>
</div>
<br />
<br />


<h2>Toggle Flip (Horizontal)</h2>
<div class="flip-container" id="flip-toggle">
  <div class="flipper">
    <div class="front" style="background: url(https://davidwalsh.name/demo/dwflip.jpg) 0 0 no-repeat;">
      <span class="name">David Walsh</span>
    </div>
    <div class="back" style="background:#f8f8f8;">
      <div class="back-logo"></div>
      <div class="back-title">@davidwalshblog</div>
      <p>Mozilla Web Developer, MooTools & jQuery Consultant, MooTools Core Developer, Javascript Fanatic, CSS Tinkerer, PHP Hacker, and web lover.</p>
    </div>
  </div>
</div>
<button onclick="document.querySelector('#flip-toggle').classList.toggle('hover');" class="sexyButton">Toggle Flip</button>
<br />
<br />

<h2>Just The Basics (Horizontal Flip)</h2>
<!-- card -->
<div class="flip-container" ontouchstart="this.classList.toggle('hover');">
  <div class="flipper">
    <div class="front">
      front
    </div>
    <div class="back">
      back
    </div>
  </div>
</div>
<br />
<br />



You can add (almost) 180 before the modulus, and subtract it later.

Not exactly 180 because then you would get -180 instead of 180.

var val = 0;
for(var i=0; i<8; ++i) {
  console.log(val = (val + 90 + 179) % 360 - 179);
}

By : Oriol


This video can help you solving your question :)
By: admin