The JavaScript Source: Forms : Check by Group

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General

By utilizing a dropdown box, a user can check a group or subgroups of checkboxes.

Notes

Created by: Mike Elkins
Posted: November 27, 2001

Source Code

Paste this source code into the designated areas.

External file

Paste this code into an external JavaScript file named: checkByGroup.js

/* This script and many more are available free online at
The JavaScript Source!! http://javascript.internet.com
Created by: Mike Elkins |  */
function selectivecheck(field, myselection) {
  var fieldid;
  var pos;
  var criteria;
  var strng;
  strng = myselection.value;
  for (i=0; i<field.length; i++) {
    if (strng=="all") {
      field[i].checked = true;
    } else {
      fieldid = field[i].id;
      pos = strng.substring(0,1);
      criteria = strng.substring(1,2);  //this gets the information we want to evaluate
      if (fieldid.substring(pos,pos+1)==criteria) {
        field[i].checked = true;
      } else {
        field[i].checked = false; //you could leave this out if you don't want to clear the check boxes
      }
    }
  }
}

Head

Paste this code into the HEAD section of your HTML document.


<script type="text/javascript" src="checkByGroup.js"></script>

Body

Paste this code into the BODY section of your HTML document


<form name="combo">
  <table align="center">
    <tr><td>
    Make Individual Selections or a Group Selection:<p>
    <select size="1" name="mycombobox" onchange="selectivecheck(this.form.list, this.form.mycombobox)">
      <option value="main" selected="selected">Group Selections</option>
      <option value="all">All Groups</option>
      <option value="0a ">Group A</option>
      <option value="0b ">Group B</option>
      <option value="0c ">Group C</option>
      <option value="11 ">SubGroup 1</option>
      <option value="12 ">SubGroup 2</option>
    </select>
    <p>
      <input id=a1 type=checkbox name=list value="1">Group A SubGroup 1<br>
      <input id=a2 type=checkbox name=list value="2">Group A SubGroup 2<br><br>
      <input id=b1 type=checkbox name=list value="3">Group B SubGroup 1<br>
      <input id=b2 type=checkbox name=list value="4">Group B SubGroup 2<br><br>
      <input id=c1 type=checkbox name=list value="5">Group C SubGroup 1<br>
      <input id=c2 type=checkbox name=list value="6">Group C SubGroup 2<br>
    </td></tr>
  </table>
</form>

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