admin 管理员组

文章数量: 1086019

I have a created a virtual keyboard to decipher a puzzle code on a html/java page, however I am unable to work out how to add a backspace or linebreak button to avoid having to mouseclick the textarea to backspace every time a single mistake is made or need a new line.

Code for the page is added below, any ideas to do this as simply as possible would be greatly appreciated, as I'm still learning Javascript and havent quite got my head around some events yet.

Thanks in advance.

<!DOCTYPE HTML>
 <HTML>
 <head>
<!--JQuery activation-->
<script src=".11.2/jquery.min.js"></script>


<div class="container-fluid">
<div class="col-md-8">

<div id="letters">
<!-- PLCKFBG HMOERJ AQNXYIZ VWSUT,.123456789O (and space) cypher alphabet-->
<input type="submit" style="font-family:'Wingdings'" value="P" style="width:100%"  id="A" />
<input type="submit" style="font-family:'Wingdings'" value="L" style="width:100%"  id="B" />
<input type="submit" style="font-family:'Wingdings'" value="C" style="width:100%"  id="C" />
<input type="submit" style="font-family:'Wingdings'" value="K" style="width:100%"  id="D" />
<input type="submit" style="font-family:'Wingdings'" value="F" style="width:100%"  id="E" />
<input type="submit" style="font-family:'Wingdings'" value="B" style="width:100%"  id="F" />
<input type="submit" style="font-family:'Wingdings'" value="G" style="width:100%"  id="G" />
<input type="submit" style="font-family:'Wingdings'" value="D" style="width:100%"  id="H" />
<input type="submit" style="font-family:'Wingdings'" value="H" style="width:100%"  id="I" />
<input type="submit" style="font-family:'Wingdings'" value="M" style="width:100%"  id="J" />
<input type="submit" style="font-family:'Wingdings'" value="O" style="width:100%"  id="K" />
<input type="submit" style="font-family:'Wingdings'" value="E" style="width:100%"  id="L" />
<input type="submit" style="font-family:'Wingdings'" value="R" style="width:100%"  id="M" />
<input type="submit" style="font-family:'Wingdings'" value="J" style="width:100%"  id="N" />
<input type="submit" style="font-family:'Wingdings'" value="A" style="width:100%"  id="O" />
<input type="submit" style="font-family:'Wingdings'" value="Q" style="width:100%"  id="P" />
<input type="submit" style="font-family:'Wingdings'" value="N" style="width:100%"  id="Q" />
<input type="submit" style="font-family:'Wingdings'" value="X" style="width:100%"  id="R" />
<input type="submit" style="font-family:'Wingdings'" value="Y" style="width:100%"  id="S" />
<input type="submit" style="font-family:'Wingdings'" value="I" style="width:100%"  id="T" />
<input type="submit" style="font-family:'Wingdings'" value="Z" style="width:100%"  id="U" />
<input type="submit" style="font-family:'Wingdings'" value="V" style="width:100%"  id="V" />
<input type="submit" style="font-family:'Wingdings'" value="W" style="width:100%"  id="W" />
<input type="submit" style="font-family:'Wingdings'" value="S" style="width:100%"  id="X" />
<input type="submit" style="font-family:'Wingdings'" value="U" style="width:100%"  id="Y" />
<input type="submit" style="font-family:'Wingdings'" value="T" style="width:100%"  id="Z" />
<input type="submit" style="font-family:'Wingdings'" value="." style="width:100%"  id="." />
<input type="submit" style="font-family:'Wingdings'" value="," style="width:100%"  id="," />
<input type="submit" style="font-family:'Wingdings'" value="1" style="width:100%"  id="1" />
<input type="submit" style="font-family:'Wingdings'" value="2" style="width:100%"  id="2" />
<input type="submit" style="font-family:'Wingdings'" value="3" style="width:100%"  id="3" />
<input type="submit" style="font-family:'Wingdings'" value="4" style="width:100%"  id="4" />
<input type="submit" style="font-family:'Wingdings'" value="5" style="width:100%"  id="5" />
<input type="submit" style="font-family:'Wingdings'" value="6" style="width:100%"  id="6" />
<input type="submit" style="font-family:'Wingdings'" value="7" style="width:100%"  id="7" />
<input type="submit" style="font-family:'Wingdings'" value="8" style="width:100%"  id="8" />
<input type="submit" style="font-family:'Wingdings'" value="9" style="width:100%"  id="9" />
<input type="submit" style="font-family:'Wingdings'" value="A" style="width:100%"  id="O" />
<input type="submit" style="font-family:'Copperplate'" value="[Space]" style="width:100%"  id=" " />
</div>
</div>

<div class="col-md-4">

<!-- Clear button -->
<div id="clearbutton">   
<input type="button" value="Clear" onclick="javascript:eraseText();"> 
</div>

<!-- textarea "translation"-->
<textarea id="translation" class="form control ChangeMe" name="translation" rows=10 cols=50 placeholder="Common Translation"></textarea>
</div>
</div>


<script>
// code for letter translation
$(document).ready(function(){
  var txt=$('#translation');
  $("#letters").on('click','input',function() {
    txt.val(txt.val()+this.id);
  });
 });


//Clear Button Function 
function eraseText() {
document.getElementById("translation").value = "";
}

//disable backspace outside of text boxes
$(document).keydown(function (e) {
                var element = e.target.nodeName.toLowerCase();
                if ((element != 'input' && element != 'textarea') || $(e.target).attr("readonly") || (e.target.getAttribute("type") ==="checkbox")) {
                    if (e.keyCode === 8) {
                    return false;
                    }
                }
});
</script>
</body>
</html>

I have a created a virtual keyboard to decipher a puzzle code on a html/java page, however I am unable to work out how to add a backspace or linebreak button to avoid having to mouseclick the textarea to backspace every time a single mistake is made or need a new line.

Code for the page is added below, any ideas to do this as simply as possible would be greatly appreciated, as I'm still learning Javascript and havent quite got my head around some events yet.

Thanks in advance.

<!DOCTYPE HTML>
 <HTML>
 <head>
<!--JQuery activation-->
<script src="http://ajax.googleapis./ajax/libs/jquery/1.11.2/jquery.min.js"></script>


<div class="container-fluid">
<div class="col-md-8">

<div id="letters">
<!-- PLCKFBG HMOERJ AQNXYIZ VWSUT,.123456789O (and space) cypher alphabet-->
<input type="submit" style="font-family:'Wingdings'" value="P" style="width:100%"  id="A" />
<input type="submit" style="font-family:'Wingdings'" value="L" style="width:100%"  id="B" />
<input type="submit" style="font-family:'Wingdings'" value="C" style="width:100%"  id="C" />
<input type="submit" style="font-family:'Wingdings'" value="K" style="width:100%"  id="D" />
<input type="submit" style="font-family:'Wingdings'" value="F" style="width:100%"  id="E" />
<input type="submit" style="font-family:'Wingdings'" value="B" style="width:100%"  id="F" />
<input type="submit" style="font-family:'Wingdings'" value="G" style="width:100%"  id="G" />
<input type="submit" style="font-family:'Wingdings'" value="D" style="width:100%"  id="H" />
<input type="submit" style="font-family:'Wingdings'" value="H" style="width:100%"  id="I" />
<input type="submit" style="font-family:'Wingdings'" value="M" style="width:100%"  id="J" />
<input type="submit" style="font-family:'Wingdings'" value="O" style="width:100%"  id="K" />
<input type="submit" style="font-family:'Wingdings'" value="E" style="width:100%"  id="L" />
<input type="submit" style="font-family:'Wingdings'" value="R" style="width:100%"  id="M" />
<input type="submit" style="font-family:'Wingdings'" value="J" style="width:100%"  id="N" />
<input type="submit" style="font-family:'Wingdings'" value="A" style="width:100%"  id="O" />
<input type="submit" style="font-family:'Wingdings'" value="Q" style="width:100%"  id="P" />
<input type="submit" style="font-family:'Wingdings'" value="N" style="width:100%"  id="Q" />
<input type="submit" style="font-family:'Wingdings'" value="X" style="width:100%"  id="R" />
<input type="submit" style="font-family:'Wingdings'" value="Y" style="width:100%"  id="S" />
<input type="submit" style="font-family:'Wingdings'" value="I" style="width:100%"  id="T" />
<input type="submit" style="font-family:'Wingdings'" value="Z" style="width:100%"  id="U" />
<input type="submit" style="font-family:'Wingdings'" value="V" style="width:100%"  id="V" />
<input type="submit" style="font-family:'Wingdings'" value="W" style="width:100%"  id="W" />
<input type="submit" style="font-family:'Wingdings'" value="S" style="width:100%"  id="X" />
<input type="submit" style="font-family:'Wingdings'" value="U" style="width:100%"  id="Y" />
<input type="submit" style="font-family:'Wingdings'" value="T" style="width:100%"  id="Z" />
<input type="submit" style="font-family:'Wingdings'" value="." style="width:100%"  id="." />
<input type="submit" style="font-family:'Wingdings'" value="," style="width:100%"  id="," />
<input type="submit" style="font-family:'Wingdings'" value="1" style="width:100%"  id="1" />
<input type="submit" style="font-family:'Wingdings'" value="2" style="width:100%"  id="2" />
<input type="submit" style="font-family:'Wingdings'" value="3" style="width:100%"  id="3" />
<input type="submit" style="font-family:'Wingdings'" value="4" style="width:100%"  id="4" />
<input type="submit" style="font-family:'Wingdings'" value="5" style="width:100%"  id="5" />
<input type="submit" style="font-family:'Wingdings'" value="6" style="width:100%"  id="6" />
<input type="submit" style="font-family:'Wingdings'" value="7" style="width:100%"  id="7" />
<input type="submit" style="font-family:'Wingdings'" value="8" style="width:100%"  id="8" />
<input type="submit" style="font-family:'Wingdings'" value="9" style="width:100%"  id="9" />
<input type="submit" style="font-family:'Wingdings'" value="A" style="width:100%"  id="O" />
<input type="submit" style="font-family:'Copperplate'" value="[Space]" style="width:100%"  id=" " />
</div>
</div>

<div class="col-md-4">

<!-- Clear button -->
<div id="clearbutton">   
<input type="button" value="Clear" onclick="javascript:eraseText();"> 
</div>

<!-- textarea "translation"-->
<textarea id="translation" class="form control ChangeMe" name="translation" rows=10 cols=50 placeholder="Common Translation"></textarea>
</div>
</div>


<script>
// code for letter translation
$(document).ready(function(){
  var txt=$('#translation');
  $("#letters").on('click','input',function() {
    txt.val(txt.val()+this.id);
  });
 });


//Clear Button Function 
function eraseText() {
document.getElementById("translation").value = "";
}

//disable backspace outside of text boxes
$(document).keydown(function (e) {
                var element = e.target.nodeName.toLowerCase();
                if ((element != 'input' && element != 'textarea') || $(e.target).attr("readonly") || (e.target.getAttribute("type") ==="checkbox")) {
                    if (e.keyCode === 8) {
                    return false;
                    }
                }
});
</script>
</body>
</html>
  • javascript
  • html
  • button
  • backspace
Share Improve this question asked Aug 6, 2015 at 18:25 SteveSteve 431 gold badge1 silver badge7 bronze badges 3
  • 1 Off topic: I would remend to use this in your CSS: input {font-family: 'wingdings';} it cleans up a lot. – Evochrome Commented Aug 6, 2015 at 18:33
  • 1 off topic: there are two buttons with value of "A" – DaniFoldi Commented Aug 6, 2015 at 18:42
  • Originally tried that, but the full page uses multiple fonts and it ended up a mess. Thanks for the suggestion though. – Steve Commented Aug 6, 2015 at 19:51
Add a ment  | 

5 Answers 5

Reset to default 5

The backspace key should just chop off the last character of the textarea right? So, just make the backspace key set the textarea's value to the textarea's value minus the last character using JavaScript's substring method. Here's some pseudocode:

function onPressBackspace() {
    myTextarea.value = myTextarea.value.substring(0, myTextarea.value.length - 1);
}

Inserting a new line is just as simple as 1+1. Just put \\\n into the code.

$("newLineButton").on("click",function(){
$("#translation").text()=$("#translation").text()+"\\\n";
});

<DOCTYPE html>
  <html>
    <head>
        <script>
            function backSpace() {
                var bsp = document.getElementById("ns").value;
                document.getElementById("ns").value=bsp.substring(0,bsp.length -1);
            }
       </script>
   </head>
<body>
<input type="text" id="ns">

<DOCTYPE html>
    <html>
        <head>
            <script>
                function backSpace() {
                    var bsp = document.getElementById("ns").value;
                    document.getElementById("ns").value=bsp.substring(0,bsp.length-1);
                }
            </script>
        </head>
<body>
    <input type="text" id="ns" onClick="backSpace()">
</body>
</html>


const backSpace=document.getElementById('backSpace')
const textBox=document.getElementById('textBox')

backSpace.addEventListener('click',function(){
textBox.value = textBox.value.substring(0, textBox.value.length-1)
})
<html>
<head>
<title>Document</title>
</head>
<body>
<button id="backSpace">BackSpace</button>
<input type="text" name="textBox" id="textBox">
</body>
</html>

本文标签： Create a backspace button for htmljavascriptbased textareaStack Overflow

版权声明：本文标题：Create a backspace button for htmljavascript-based textarea - Stack Overflow 内容由网友自发贡献，该文观点仅代表作者本人， 转载请联系作者并注明出处：http://roclinux.cn/p/1744099160a2533417.html， 本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容，一经查实，本站将立刻删除。