Want to iterate through html table and check first cell data is duplicated?

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Hi,

I have one html table 'tab1'

XML

<table id="tab1">
               <tr>
                   <th>Empno</th>
                   <th>Ename</th>
                   <th>Salary</th>
               </tr>
               <tr>
                   <td>1</td>
                   <td>A</td>
                   <td>1000</td>
               </tr>
               <tr>
                   <td>1</td>
                   <td>A</td>
                   <td>1000</td>
               </tr>
               <tr>
                   <td>1</td>
                   <td>B</td>
                   <td>2000</td>
               </tr>
               <tr>
                   <td>2</td>
                   <td>C</td>
                   <td>3000</td>
               </tr>
               <tr>
                   <td>3</td>
                   <td>D</td>
                   <td>4000</td>
               </tr>
               <tr>
                   <td>3</td>
                   <td>A</td>
                   <td>1000</td>
               </tr>
           </table>

I want to check with every row first column. If more than one time with same data of that row first cell then want to make it as invisible false.
I tried but not able to achieve.

Can any one help me to complete this.

Posted 1-Apr-15 18:28pm

Member 8503274

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Sergey Alexandrovich Kryukov 2-Apr-15 0:39am

If you asked question about HTML DOM manipulation, you are supposed to know HTML. If you know HTML, you can cope with HTML of your post. Right now, you don't show a table in your code, you show HTML with some characters escaped with HTML character entities. Please pay some attention to what you write yourself.

Now, What have you tried so far?

As you tagged "jQuery", you probably know what is that. So the answer would be: actually use jQuery, not just tag it. What's the problem?

Another question for you: why not preventing duplication of data in first place, when it is first populated?

—SA

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Mohibur Rashid · Answer 1 · 2015-04-01T21:58:00

Along with Sergy Alexandrovich Kryukov, if you are not using jquery
then try the following:

JavaScript

var tbl1=document.getElementById("tab1"); 
//alt 
var tbl1=document.querySelector("#tab1"); 

    for(var i=0;i<tbl1.rows.length;i++){>
      whatever_function(tbl1.rows[i].cells[0].innerHTML);
    }

Member 8503274 · Answer 2 · 2015-04-16T20:59:00

Solution 3

Thanks everybody for your solutions

Posted 16-Apr-15 20:59pm

Member 8503274

Sergey Alexandrovich Kryukov · Answer 3 · 2015-04-01T18:49:00

Please see my comment to the question. Actually use jQuery, not just tag it:
http://api.jquery.com/category/traversing.

Another idea: if you already know the structure (how many cells per row, first of all), you can simply take all the <td> elements and iterate through the set:

JavaScript

var allCells = $("td");
allCells.each(function(index){
   // do whatever you want,
   // using index and $(each)
})

Please see:
https://api.jquery.com/each,
not to be confused with https://api.jquery.com/jquery.each.

If you have more than one table on the page, use more complex selector. See for example: https://api.jquery.com/multiple-selector.

This is all really simple.

—SA

Want to iterate through html table and check first cell data is duplicated?

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