Textarea值为NULL javascript

Question

I want to display the text area value. I generate it with PHP code This code is in the looping

 for($i=0;$i<$piecount;$i++)
    {
    echo "<tr><td class=\"forma\" align=\"center\">".$compc[$i]."</td>";
    if($i==0)
    {
       echo "<td align=\"center\" class=\"forma\" rowspan=".$pcg."  style=\"\"> 
      <textarea name=\"eva\" id=\"evatext\"   class=\"textEva\" >
      </textarea> 
      <input type=\"image\"src=\"image/save.jpg\"class=\"imgClass\" onclick=\"EvaCek();\" name=\"save\"></td></tr>";

} }

Also I have a html code for dummy my id for inputdate which is displayed none

<input name="evadate" id="inputdate" style="display:none">

And I pass it to javascript

function EvaCek()
{
    var dateobj = new Date();
        var month = dateobj.getUTCMonth()+1;
        var day = dateobj.getUTCDate();
        var year = dateobj.getUTCFullYear();
        var tes=document.getElementById("inputdate").innerHTML= year+"-"+month+"-"+day;
        var bla=document.getElementById("evatext").value;

    if(bla!="")
    {
     alert(tes);
     alert(bla);

    }

}

When I type something into the text area and save it, it does the alert, but only the date, the text area is NULL. What is wrong in here? Thank you

Answer 1

It is because ID should be unique for each input.

IDs must be unique

For more info, check here Unique ID

So, access it through class name. I'm not seeing anywhere 'inputdate' . So, i didn't edited it. But, Don't access inputdate or textarea through ID . Because, forloop is creating numerous number of <textarea></textarea> and every textarea is having the same id . Avoid accessing with ID .

<?
for($i=0;$i<$piecount;$i++)
{
    echo "<tr><td class=\"forma\" align=\"center\">".$compc[$i]."</td>";
    if($i==0)
    {
        echo "<td align=\"center\" class=\"forma\" rowspan=".$pcg."  style=\"\"> 
            <textarea name=\"eva\" id=\"evatext\" class=\"textEva\" ></textarea> 
            <input type=\"image\"src=\"image/save.jpg\"class=\"imgClass\" onclick=\"EvaCek();\" name=\"save\">
        </td>
        </tr>";
    }
}
?>

<?
function EvaCek()
{
  var dateobj = new Date();
      var month = dateobj.getUTCMonth()+1;
      var day = dateobj.getUTCDate();
      var year = dateobj.getUTCFullYear();
            //change for inputdate. Access it through class name.
      var tes=document.getElementByClass("inputdate").innerHTML= year+"-"+month+"-"+day;
      var bla=document.getElementByClass("textEva").value;

  if(bla!="")
  {
   alert(tes);
   alert(bla);

  }
}
?>

Answer 2

use this to get value of text area ... demo

document.getElementById("evatext").innerHTML; 

full code

function EvaCek()
{
    var dateobj = new Date();
    var month = dateobj.getUTCMonth()+1;
    var day = dateobj.getUTCDate();
    var year = dateobj.getUTCFullYear();
    var tes=document.getElementById("inputdate").innerHTML= year+"-"+month+"-"+day;
    var bla=document.getElementById("evatext").innerHTML;// use this

    if(bla!="")
    {
     alert(tes);
     alert(bla);

    }
}