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Javascript button to but text into a textarea

Posted on 2004-04-16
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Last Modified: 2008-02-26
Im creating a form with a textarea and have buttons that i want the user to be able to click on and it will put an open tag and then second click put a close tag which will be used to format the text.

I currently have:

tags = new Array('[b]','[/b]','[i]','[/i]','[u]','[/u]','[quote]','[/quote]','[img]','[/img]','[url]','[/url]');
var click = 0;

function addtag(which) {
      if ( click == 0 ){
            click = 1;
            val = document.post.message.value;
            document.post.message.value += tags[which];
      } else {
            click = 0;
            val = document.post.message.value;
            document.post.message.value += tags[which + 1];
      }
}

This does that but i have more than one button which run the same function so i could start 1 tag but close with a totaly different tag.

There must be a way of doing it with 1 function rather than having a seperate function for each button.
I would also like the text to insert to where the mouse pointer is in the text area and not at the end and possibly some sort of validation so the tags go in order and they dont open 1 and then a 2nd but close the 1st one first and the 2nd last
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Question by:KArrowsmith
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7 Comments
 
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Expert Comment

by:azcn2503
ID: 10840715
I did something like this.... I did it using a for{} loop and detecting a carried variable in a function. I had exactly your problem, in every sense. I'll get my head down later... I need to prepare for my girlfriend's arrival.
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Expert Comment

by:azcn2503
ID: 10840848
Here's all I came up with when waiting for my hot water to actually get hot for me to have a bath... It just happens to be a very long winded method of what you have already. but it's a different method. All the button values come from an array which can be added to real easily, as soon as you add a few characters in the array the buttons change (anothero one appears and all the formatting applies to it)... Anyway, here you go:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
  <meta name="author" content="Aaron Cunnington" />
  <title></title>
  <style type="text/css">
  </style>
  <script type="text/javascript">
   tagsA=new Array("b","i","u","s","img","url")
   function formatMessage(formatButtonID,formatButtonValue){
    for(i=0;i<=tagsA.length-1;i++){
     if(formatButtonValue=="["+tagsA[i]+"]"||formatButtonValue=="[\/"+tagsA[i]+"]"){
      if(formatButtonValue.substr(1,formatButtonValue.length-2)==tagsA[i]){
       document.getElementById("message").setAttribute("innerText",document.getElementById("message").getAttribute("value")+formatButtonValue);
       document.getElementById("message").focus();
       formatButtonValue="[\/"+formatButtonValue.substr(1,formatButtonValue.length-2)+"]";
       document.getElementById(formatButtonID).setAttribute("value",formatButtonValue);
      }
      else{
       document.getElementById("message").setAttribute("innerText",document.getElementById("message").getAttribute("value")+formatButtonValue);
       document.getElementById("message").focus();
       formatButtonValue="["+formatButtonValue.substr(2,formatButtonValue.length-3)+"]";
       document.getElementById(formatButtonID).setAttribute("value",formatButtonValue)
      }
     }
    }
   }
  </script>
 </head>
 <body>
  <textarea style="width:300px;height:200px;font-family:Lucida Sans;font-size:10px;" id="message"></textarea><br />
  <script type="text/javascript">
   for(i=0;i<tagsA.length;i++){
    document.write("<input type=\"button\" id=\"formatButton_"+tagsA[i]+"\" value=\"["+tagsA[i]+"]\""
    +" onclick=\"formatMessage(this.id,this.value);\" \/>");
   }
  </script>
 </body>
</html>
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Author Comment

by:KArrowsmith
ID: 10840897
that sorts out the first problem of opening and closing the tags independently of each other but it places the new tag at the end of the text in the textarea rather than at the position where the mouse pointer is and also you can open the first tag and then the second but it allows you to close them in a incorrect order. I imagine validating the order would make the script very long.
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Expert Comment

by:azcn2503
ID: 10841402
There's always a way.
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Accepted Solution

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Lord_McFly earned 100 total points
ID: 10848759
Mentioned above was the problem of ensuring that the closing tags followed in the correct order. The following code has a tag button b,i,img etc and a button which is used for closing the tags. Stored is the correct closing tag so if you click...

[b][i][s] for example the closing tag button is display [/s], then [/i] ans then [/b] - this ensures that you tags all closed in the correct order - it doesn't matter how many tags you open the closing tag button will always have the correct closing tag ready.

Have a go - see what you think.

<html>
<head>
<title>Tags</title>
<script language="JavaScript">
<!--
function DoTag(Action, Tag)
      {
            var content = document.Tags.f_0.value
            var closing = document.Tags.Closing.value
            
            if(Action==0)
                  {
                        content = content + "[" + Tag + "]";
                        document.Tags.f_0.value = content;
                        
                        closing = "[/" + Tag + "] " + closing;
                        document.Tags.Closing.value = closing;
                        document.Tags.Close.value = "[/" + Tag + "]";
                        
                        document.Tags.f_0.focus();
                  }
            else
                  {
                        closing = closing.substr(0,closing.length-1);
                        
                        var tags = closing.split(" ");
                        var items = tags.length - 1;
                        var i
                        
                        content = content + tags[0];
                        document.Tags.f_0.value = content;

                        if(items >0)
                              {
                                    closing = "";
                                    
                                    for(i=0; i< items; i++)
                                          {
                                                closing = closing + tags[i+1] + " ";
                                          }
                                    
                                    document.Tags.Closing.value = closing;
                                    document.Tags.Close.value = tags[1];
                              }
                        else
                              {
                                    document.Tags.Closing.value = ""
                                    document.Tags.Close.value = ""
                              }

                        document.Tags.f_0.focus();
                  }
      }
//-->
</script>
</head>
<body>
<form name="Tags" method="post" action="Tags.htm">
      <textarea name="f_0" style="WIDTH: 300px; HEIGHT: 200px"></textarea><br>
      <input type="button" name="Button" value="b" OnClick="DoTag(0,'b'); return false">
      <input type="button" name="Button" value="i" OnClick="DoTag(0,'i')">
      <input type="button" name="Button" value="u" OnClick="DoTag(0,'u')">
      <input type="button" name="Button" value="s" OnClick="DoTag(0,'s')">
      <input type="button" name="Button" value="img" OnClick="DoTag(0,'img')">
      <input type="button" name="Button" value="url" OnClick="DoTag(0,'url')">
      <input type="button" name="Close" value="" onClick="DoTag(1,this)">
      <input type="hidden" name="Closing" value="">
 </body>
</html>
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Expert Comment

by:Lord_McFly
ID: 10885482
Do you need any more assistance on this question?
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Author Comment

by:KArrowsmith
ID: 10887076
No sure just yet, been working on another section of the site. I found another script somewhere and now have 3 scripts that each do a different point, one to make sure the right closing tag is put it according to the button, one to check the tags are in a valid order and another which puts text at the places of the mouse pointer
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