[2 days left] What’s wrong with your cloud strategy? Learn why multicloud solutions matter with Nimble Storage.Register Now

x
?
Solved

Validate textbox with client generated button

Posted on 2016-09-19
6
Medium Priority
?
95 Views
Last Modified: 2016-09-20
I have button like this.  It allows comma separated values.  
How can I check to make sure that no individual value is more than 4 characters?
Ideally, I'd like to check that all the values are alpha numeric, but I don't know how to use REGEX in JavaScript.


                   <input id="Button2" type="button" value="Add" 
                    onclick="Javascript:AddItemFromTextBox('ctl00_ContentPlaceHolder1_lstFileNameCode','ctl00_ContentPlaceHolder1_cmbFileNameCode','ctl00_ContentPlaceHolder1_hidfilenamecodecmb','ctl00_ContentPlaceHolder1_hidfilenamecodelst','ctl00_ContentPlaceHolder1_txtFileNameCode2')"; />

Open in new window


It's validated like this.

function AddItemFromTextBox(ListBox,DropDownBox,hiddenCmb,hiddenLst,TextBox) 
 { 

    var Lbox = document.getElementById(ListBox);
    var cmbBox = document.getElementById(DropDownBox);
    var hidcmb=document .getElementById (hiddenCmb);
    var hidlst=document .getElementById (hiddenLst);
    var Tbox = document.getElementById(TextBox); 
    var myStringArray=SplitTheString(Tbox.value);
    //if (SplitTheString(Tbox.value) != null)
    if (myStringArray !=null)
    {       
        for (var i = 0; i < myStringArray.length; i++) 
        {
            var newOption = window.document.createElement('OPTION');
            newOption.text = myStringArray[i];
            newOption.value = myStringArray[i];
            if (myStringArray[i] != "")
            {
                Lbox.options.add(newOption);
            }
        }
    }
    else
    {
        var newOption = window.document.createElement('OPTION');
        newOption.text = Tbox.value;
        newOption.value = Tbox.value;
        Lbox.options.add(newOption);
        Lbox.options.add(newOption);
    }
    persistOptionsListTextBox(Lbox,Tbox,hidcmb,hidlst);
    arrTexts = new Array();

    for(i=0; i<Lbox.length; i++) 
    {
     arrTexts[i] = Lbox.options[i].text;
    }
    Lbox.options.length = 0;
    arrTexts.sort();

    for(j=0; j<i; j++) 
    {
        var newOption = window.document.createElement('OPTION');
        newOption.text = arrTexts[j];
        newOption.value = arrTexts[j];

        Lbox.options.add(newOption);
    }
function SplitTheString(CommaSepStr) {
       var ResultArray = null; 
       var SplitChars = ',';
        if (CommaSepStr!= null) {
            
            if (CommaSepStr.indexOf(SplitChars) >= 0) 
            {
                ResultArray = CommaSepStr.split(SplitChars);
            }
            else if (CommaSepStr != "")
            {
                CommaSepStr+=","
                ResultArray=CommaSepStr.split(SplitChars);
            }
        }
       return ResultArray ;
    }

  function persistOptionsListTextBox(lstfiletypecode,txtfiletypecode,hidfiletypecodecmb,hidfiletypecodelst)
  {
        var optionsList = '';
        var myStringArray=SplitTheString(txtfiletypecode.value);
        //if (SplitTheString(Tbox.value) != null)
        if (myStringArray !=null)
        {       
            for (var i = 0; i < myStringArray.length; i++) 
            {
                 var optionText = myStringArray[i];
                 var optionValue = myStringArray[i];
                 optionsList += optionText + ':' + optionValue;

            }
        }
      if (hidfiletypecodecmb.value != "" && hidfiletypecodecmb.value.length <100)
      {
        hidfiletypecodecmb.value += ';' + optionsList;
      }
      if (hidfiletypecodecmb.value == "")
      {
        hidfiletypecodecmb.value = optionsList;
      }
      optionsList = '';
      for (var i=0; i<lstfiletypecode.options.length; i++)
      {
         var optionText = lstfiletypecode.options[i].text;
         var optionValue = lstfiletypecode.options[i].value;
       
         if ( optionsList.length > 0 )
         {
            optionsList += ';';
         }
         optionsList += optionText + ':' + optionValue;
      }
      if (hidfiletypecodelst.value != "" && hidfiletypecodelst.value.length <100)
      {
         //hidfiletypecodelst.value += ';' + optionsList;
         hidfiletypecodelst.value = optionsList;
      }
      if (hidfiletypecodelst.value == "")
      {
         hidfiletypecodelst.value = optionsList;
      }
 }
 }

Open in new window

0
Comment
Question by:AlHal2
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
6 Comments
 
LVL 10

Expert Comment

by:Paweł
ID: 41806231
I think your pattern can be ^([a-z|0-9]{0,4},\s?){3}[a-z|0-9]{0,4}$ it'll cover space before the commas

http://codepen.io/chooch/pen/EgNYVK?editors=1010

function test(){
 
  var re = new RegExp("^([a-z|0-9]{0,4},\\s?){3}[a-z|0-9]{0,4}$");
  
  var value = document.getElementById("input").value;
  
  alert(re.test(value));
}

Open in new window


<input id="input" type="text" value="sd4,23e4,23e,2e42"  />
<button onclick="test()">test</button>

Open in new window

0
 
LVL 35

Accepted Solution

by:
Terry Woods earned 2000 total points
ID: 41806246
The match function returns an array of matches or null if no match.

Here's an example of testing a value against a regex, with a pattern that might suit your needs:
  var matches='1234,2a4,12f'.match(/^[a-z0-9]{1,4}(,[a-z0-9]{1,4})*$/i);
  if (matches === null) {
    alert('no match');
  } else {
    alert(matches[0]+" matched");
  };

Open in new window

0
 
LVL 35

Expert Comment

by:Terry Woods
ID: 41806248
Ha, I was a bit slow writing my code...
0
Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

 
LVL 35

Expert Comment

by:Terry Woods
ID: 41806252
@Pawel, your pattern is not quite correct actually: [a-z|0-9] allows a pipe character as a valid character (the pipe shouldn't be there - it's only used as an alternation operator when not in square brackets, which is I think what you were intending it to mean)...  allowing the space characters might be important though (I didn't allow for those)

Not sure how many values can be in the list, but Pawel's pattern has a limit of 4, whereas mine is unlimited.

Hope that helps anyway
0
 

Author Closing Comment

by:AlHal2
ID: 41806318
I modified it a bit, but thanks very much.

var matches = myStringArray[i].match(/^[A-Za-z0-9]{1,4}(,[A-Za-z0-9]{1,4})*$/i);
            if (matches === null)
            {
                alert(myStringArray[i]+" rejected");
            }
            else
            {
                //alert(matches[0] + " matched");
                //if (myStringArray[i] != "")
                if (myStringArray[i].length == 4)
                {
                    Lbox.options.add(newOption);
                }
                else
                {
                    alert(myStringArray[i] + " must be 4 characters");
                }
            };
0
 
LVL 10

Expert Comment

by:Paweł
ID: 41806813
good point; i misread, for some reason i got it into my head that alhal2 was looking to match 4 groups of 4 alpha numeric numbers. good catch on the extra pipe, regex is one of those things i use on occasion.
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Whatever be the reason, if you are working on web development side,  you will need day-today validation codes like email validation, date validation , IP address validation, phone validation on any of the edit page or say at the time of registration…
We are witnesses that everyone is saying that our children shouldn't "play" with a technology because it is dangerous. This article is going to prove that they are wrong.
Learn how to match and substitute tagged data using PHP regular expressions. Demonstrated on Windows 7, but also applies to other operating systems. Demonstrated technique applies to PHP (all versions) and Firefox, but very similar techniques will w…
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

656 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question