Changing a certain value with an input javascript?

Question

So I have a javascript find and replace code here that finds what you search and replaces with an input. I need the code to find "xxxxxx" without asking for an input so the only input left would be the replace box which would automatically change xxxxxx to the user input. Any suggestions? here's my code:

var haystackText = "";

function findMyText(needle, replacement) {
  if (haystackText.length == 0) {
    haystackText = document.getElementById("haystack").innerHTML;
  }
  var match = new RegExp(needle, "ig");
  var replaced = "";
  if (replacement.length > 0) {
    replaced = haystackText.replace(match, replacement);
  } else {
    var boldText = "<div style=\"background-color: yellow; display: inline; font-weight: bold;\">" + needle + "</div>";
    replaced = haystackText.replace(match, boldText);
  }
  document.getElementById("haystack").innerHTML = replaced;
}

<div id="haystack">
  <p>Paragraph paragraph paragraph xxxxxx paragraph</p>
  <p>Paragraph paragraph paragraph xxxxxx paragraph</p>
  <p>Paragraph paragraph paragraph xxxxxx paragraph</p>
</div>
<br>
<table>
  <tr>
    <td>Find</td>
    <td><input id="needle" name="needle" type="text"></td>
  </tr>
  <tr>
    <td>Replacment</td>
    <td><input id="replacement" name="replacement" type="text"></td>
  </tr>
</table>
<input type="button" value="Update" onClick="findMyText(document.getElementById('needle').value, document.getElementById('replacement').value);">

Just delete the row for the find input and call the function using these parameters: findMyText('xxxxxx', document.getElementById('replacement').value); — Titus
– Titus, Commented Oct 28, 2017 at 13:11

Titus · Accepted Answer · 2017-10-28 13:12:46Z

Just delete the row for the find input and call the function using these parameters: findMyText('xxxxxx', document.getElementById('replacement').value);

This is what I mean:

var haystackText = "";
function findMyText(needle, replacement) {
     if (haystackText.length == 0) {
          haystackText = document.getElementById("haystack").innerHTML;
     }
     var match = new RegExp(needle, "ig");     
     var replaced = "";
     if (replacement.length > 0) {
          replaced = haystackText.replace(match, replacement);
     }
     else {
          var boldText = "<div style=\"background-color: yellow; display: inline; font-weight: bold;\">" + needle + "</div>";
          replaced = haystackText.replace(match, boldText);
     }
     document.getElementById("haystack").innerHTML = replaced;
}

<div id="haystack">
<p>Paragraph paragraph paragraph xxxxxx paragraph</p>
<p>Paragraph paragraph paragraph xxxxxx paragraph</p>
<p>Paragraph paragraph paragraph xxxxxx paragraph</p>
</div>
<br>
<table>
<tr><td>Replacment</td><td><input id="replacement" name="replacement" type="text"></td></tr>
</table>
<input type="button" value="Update" onClick="findMyText('xxxxxx', document.getElementById('replacement').value);">

Nisarg Shah · Accepted Answer · 2017-10-28 13:21:25Z

You can just modify your onclick handler to have the fixed value xxxxx. Like this: onClick="findMyText('xxxxxx', document.getElementById('replacement').value);"

var haystackText = "";

function findMyText(needle, replacement) {
  if (haystackText.length == 0) {
    haystackText = document.getElementById("haystack").innerHTML;
  }
  var match = new RegExp(needle, "ig");
  var replaced = "";
  if (replacement.length > 0) {
    replaced = haystackText.replace(match, replacement);
  } else {
    var boldText = "<div style=\"background-color: yellow; display: inline; font-weight: bold;\">" + needle + "</div>";
    replaced = haystackText.replace(match, boldText);
  }
  document.getElementById("haystack").innerHTML = replaced;
}

<div id="haystack">
  <p>Paragraph paragraph paragraph xxxxxx paragraph</p>
  <p>Paragraph paragraph paragraph xxxxxx paragraph</p>
  <p>Paragraph paragraph paragraph xxxxxx paragraph</p>
</div>
<br>
<table>
  <!--<tr><td>Find</td><td><input id="needle" name="needle" type="text"></td></tr>-->
  <tr>
    <td>Replacment</td>
    <td><input id="replacement" name="replacement" type="text"></td>
  </tr>
</table>
<input type="button" value="Update" onClick="findMyText('xxxxxx', document.getElementById('replacement').value);">

If you want the text to update "live", as the user types in, you can use onInput handler on the textbox.

var haystackText = "";

function findMyText(needle, replacement) {
  if (haystackText.length == 0) {
    haystackText = document.getElementById("haystack").innerHTML;
  }
  var match = new RegExp(needle, "ig");
  var replaced = "";
  if (replacement.length > 0) {
    replaced = haystackText.replace(match, replacement);
  } else {
    var boldText = "<div style=\"background-color: yellow; display: inline; font-weight: bold;\">" + needle + "</div>";
    replaced = haystackText.replace(match, boldText);
  }
  document.getElementById("haystack").innerHTML = replaced;
}

<div id="haystack">
  <p>Paragraph paragraph paragraph xxxxxx paragraph</p>
  <p>Paragraph paragraph paragraph xxxxxx paragraph</p>
  <p>Paragraph paragraph paragraph xxxxxx paragraph</p>
</div>
<br>
<table>
  <!--<tr><td>Find</td><td><input id="needle" name="needle" type="text"></td></tr>-->
  <tr>
    <td>Replacment</td>
    <td><input id="replacement" name="replacement" type="text" onInput="findMyText('xxxxxx', document.getElementById('replacement').value);"></td>
  </tr>
</table>
<!--<input type="button" value="Update" onClick="findMyText('xxxxxx', document.getElementById('replacement').value);">-->

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