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    Forms related code snippets

    Here are some <form> related code snippets.

    Date picker

    (before implementing it in a working environment, please read the note about the const statement compatibility)

    <!doctype html>
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>DatePicker Example - MDN</title>
    <script type="text/javascript">
    
    /*\
    |*|
    |*|  DatePicker Example - Mozilla Developer Network
    |*|
    |*|  https://developer.mozilla.org/en-US/docs/Code_snippets/Forms
    |*|  https://developer.mozilla.org/User:fusionchess
    |*|
    |*|  This snippet is released under the GNU Public License, version 3 or later.
    |*|  http://www.gnu.org/licenses/gpl-3.0-standalone.html
    |*|
    \*/
    
    (function () {
    
      function DatePicker (oTarget) {
    
        const
    
          oTable = document.createElement("table"), oHRow = document.createElement("tr"),
          oTHead = document.createElement("thead"), oCapt = document.createElement("caption"),
          oDecrYear = document.createElement("span"), oIncrYear = document.createElement("span"),
          oDecrMonth = document.createElement("span"), oIncrMonth = document.createElement("span");
    
        var
    
          nId = aInstances.length, oTH;
    
        this.target = oTarget;
        this.display = document.createElement("span");
        this.current = new Date();
        this.container = oTable;
        this.display.className = sPrefs + "-current-month";
        this.id = nId;
        oTable.className = sPrefs + "-calendar";
        oTable.id = sPrefs + "-cal-" + nId;
        oDecrYear.className = sPrefs + "-decrease-year";
        oDecrMonth.className = sPrefs + "-decrease-month";
        oIncrMonth.className = sPrefs + "-increase-month";
        oIncrYear.className = sPrefs + "-increase-year";
        oDecrYear.innerHTML = "\u00AB"; /* &laquo; */
        oDecrMonth.innerHTML = "\u003C"; /* &lt; */
        oIncrMonth.innerHTML = "\u003E"; /* &gt; */
        oIncrYear.innerHTML = "\u00BB"; /* &raquo; */
        oDecrYear.id = sPrefs + "-decr-year-" + nId;
        oDecrMonth.id = sPrefs + "-decr-month-" + nId;
        oIncrMonth.id = sPrefs + "-incr-month-" + nId;
        oIncrYear.id = sPrefs + "-incr-year-" + nId;
        oDecrYear.onmousedown = oIncrYear.onmousedown = oDecrMonth.onmousedown = oIncrMonth.onmousedown = onHeadClick;
    
        for (var nThId = 0; nThId < 7; nThId++) {
          oTH = document.createElement("th");
          oTH.innerHTML = sDays[nThId];
          oHRow.appendChild(oTH);
        }
    
        oTHead.appendChild(oHRow);
        oCapt.appendChild(oDecrYear); oCapt.appendChild(oDecrMonth); oCapt.appendChild(oIncrYear); oCapt.appendChild(oIncrMonth);
        oCapt.appendChild(this.display); this.container.appendChild(oCapt); this.container.appendChild(oTHead);
    
        this.current.setDate(1);
        this.writeDays();
    
        oTarget.onclick = function () {
          if (oTable.parentNode) {
            oTable.parentNode.removeChild(oTable);
            return;
          }
          oTable.style.zIndex = nZIndex++;
          oTable.style.position = "absolute";
          oTable.style.left = oTarget.offsetLeft + "px";
          oTable.style.top = (oTarget.offsetTop + oTarget.offsetHeight) + "px";
          oTarget.parentNode.insertBefore(oTable, oTarget);
        };
    
        aInstances.push(this);
    
      }
    
      DatePicker.prototype.writeDays = function () {
    
        const
    
          nEndBlanks = (this.current.getDay() + bZeroIsMonday * 6) % 7,
          nEnd = aMonthLengths[this.current.getMonth()] + nEndBlanks,
          nTotal = nEnd + ((7 - nEnd % 7) % 7);
    
        var
    
          oTD, oTR;
    
        if (this.oTBody) { this.container.removeChild(this.oTBody); }
    
        this.oTBody = document.createElement("tbody");
    
        for (var nDay, oDay, nIter = 0; nIter < nTotal; nIter++) {
          if (nIter % 7 === 0) {
            oTR = document.createElement("tr");
            this.oTBody.appendChild(oTR);
          }
          nDay = nIter - nEndBlanks + 1;
          oTD = document.createElement("td");
          if (nIter + 1 > nEndBlanks && nIter < nEnd) {
            oTD.className = sPrefs + "-active-cell";
            oTD.id = sPrefs + "-day-" + this.id + "-" + nDay;
            oTD.onclick = onDayClick;
            oTD.appendChild(document.createTextNode(nDay));
          } else {
            oTD.className = sPrefs + "-empty-cell";
          }
          oTR.appendChild(oTD);
        }
    
        this.display.innerHTML = sMonthsNames[this.current.getMonth()] + " " + this.current.getFullYear();
        this.container.appendChild(this.oTBody);
    
      };
    
      function onDocClick (oPssEvt) {
        const oEvt = oPssEvt || /* IE */ window.event;
        var bOutside = true;
        for (var oNode = oEvt.target || /* IE */ oEvt.srcElement; oNode; oNode = oNode.parentNode) {
          if (oNode.className === sPrefs + "-calendar" || oNode.className === sDPClass) {
            bOutside = false;
            break;
          }
        }
        if (bOutside) { return; }
        aInstances[oNode.id.replace(rBgnNaN, "")].container.style.zIndex = nZIndex++;
      }
    
      function onHeadClick () {
        const bIsMonth = rMonth.test(this.id), nDelta = rDecrease.test(this.id) ? -1 : 1, oThisCal = aInstances[this.id.replace(rBgnNaN, "")];
        oThisCal.current[bIsMonth ? "setMonth" : "setYear"](oThisCal.current[bIsMonth ? "getMonth" : "getFullYear"]() + nDelta);
        oThisCal.writeDays();
        return false;
      }
    
      function onDayClick () {
        const oThisCal = aInstances[this.id.replace(rBgnANDEnd, "")];
        oThisCal.target.value = (this.innerHTML / 100).toFixed(2).substr(-2) + "\/" + (oThisCal.current.getMonth() + 1) + "\/" + oThisCal.current.getFullYear();
        oThisCal.container.parentNode.removeChild(oThisCal.container);
        return false;
      }
    
      function buildCalendars () {
        const aFields = document.getElementsByClassName(sDPClass), nLen = aFields.length;
        for (var nItem = 0; nItem < nLen; new DatePicker(aFields[nItem++]));
      }
    
      const
    
        /* customizable by user */
        sPrefs = "zdp";
        sDPClass = "date-picker",
        sMonthsNames = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
        sDays = ["M", "T", "W", "T", "F", "S", "S"],
        bZeroIsMonday = true,
    
        /* internal usage */
        aInstances = [],
        aMonthLengths = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],
        rBgnNaN = /^\D+/, rBgnANDEnd = /^\D+|\D+\d+$/g, rMonth = /\-month\-/, rDecrease = /\-decr\-/;
    
      var
    
        /* customizable by user */
        nZIndex = 1000;
    
      window.addEventListener ? addEventListener("load", buildCalendars, false) : window.attachEvent ? attachEvent("onload", buildCalendars) : (onload = buildCalendars);
    
      document.addEventListener ? document.addEventListener("mousedown", onDocClick, false) : document.attachEvent ? document.attachEvent("onmousedown", onDocClick) : (document.onmousedown = onDocClick);
    
    })();
    
    </script>
    <style type="text/css">
    table.zdp-calendar {
      border: 1px solid #666666;
      border-collapse: collapse;
      background-color: #cccccc;
      cursor: default;
      font-family: verdana;
      font-size: 12px;
    }
    
    table.zdp-calendar th {
      border: 1px solid #666666;
      font-weight: bold;
      background-color: #ff6666;
    }
    
    table.zdp-calendar td {
      border: 1px solid #666666;
      text-align: center;
    }
    
    table.zdp-calendar caption {
      background-color: #333333;
      padding: 2px;
    }
    
    span.zdp-current-month {
      display: inline-block;
      width: auto;
      height: 16px;
      padding: 0 2px;
      line-height: 16px;
      margin: 0 auto;
      background-color: #999999;
      border-radius: 5px;
    }
    
    span.zdp-increase-month, span.zdp-increase-year, span.zdp-decrease-month, span.zdp-decrease-year {
      display: block;
      padding: 0 2px;
      height: 16px;
      font-weight: bold;
      background-color: #999999;
      border-radius: 5px;
      cursor: pointer;
    }
    
    span.zdp-decrease-month, span.zdp-decrease-year {
      float: left;
      margin-right: 2px;
    }
    
    span.zdp-increase-month, span.zdp-increase-year {
      float: right;
      margin-left: 2px;
    }
    
    td.zdp-active-cell {
      padding: 1px 3px;
      cursor: pointer;
      color: #000000;
      text-align: center;
      vertical-align: middle;
    }
    
    td.zdp-active-cell:hover {
      background-color: #999999;
      cursor: pointer;
    }
    
    td.zdp-empty-cell {
      cursor: not-allowed;
    }
    </style>
    
    </head>
    <body>
    
    <form name="myform">
      <p>
        From: <input type="text" readonly class="date-picker" name="date-from" />
        To: <input type="text" readonly class="date-picker" name="date-to" />
      </p>
    </form>
    
    </body>
    </html>
    Note: The current implementation of const (constant statement) is not part of ECMAScript 5. It is supported in Firefox & Chrome (V8) and partially supported in Opera 9+ and Safari. It is not supported in Internet Explorer 6-9, or in the preview of Internet Explorer 10. const is going to be defined by ECMAScript 6, but with different semantics. Similar to variables declared with the let statement, constants declared with const will be block-scoped. We used it only for didactic purpose. If you want a full browser compatibility of this library, please replace all the const statements with the var statements.

    This date-picker code snippet will automatically create an HTML code like the following:

    <table id="zdp-cal-1" class="zdp-calendar" style="z-index: 1026; position: absolute; left: 294px; top: 47px;">
      <caption><span id="zdp-decr-year-1" class="zdp-decrease-year">&laquo;</span><span id="zdp-decr-month-1" class="zdp-decrease-month">&lt;</span><span id="zdp-incr-year-1" class="zdp-increase-year">&raquo;</span><span id="zdp-incr-month-1" class="zdp-increase-month">&gt;</span>
        <span class="zdp-current-month">Aug 1998</span>
      </caption>
      <thead>
        <tr>
          <th>M</th>
          <th>T</th>
          <th>W</th>
          <th>T</th>
          <th>F</th>
          <th>S</th>
          <th>S</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td class="zdp-empty-cell">&nbsp;</td>
          <td class="zdp-empty-cell">&nbsp;</td>
          <td class="zdp-empty-cell">&nbsp;</td>
          <td class="zdp-empty-cell">&nbsp;</td>
          <td class="zdp-empty-cell">&nbsp;</td>
          <td id="zdp-day-1-1" class="zdp-active-cell">1</td>
          <td id="zdp-day-1-2" class="zdp-active-cell">2</td>
        </tr>
        <tr>
          <td id="zdp-day-1-3" class="zdp-active-cell">3</td>
          <td id="zdp-day-1-4" class="zdp-active-cell">4</td>
          <td id="zdp-day-1-5" class="zdp-active-cell">5</td>
          <td id="zdp-day-1-6" class="zdp-active-cell">6</td>
          <td id="zdp-day-1-7" class="zdp-active-cell">7</td>
          <td id="zdp-day-1-8" class="zdp-active-cell">8</td>
          <td id="zdp-day-1-9" class="zdp-active-cell">9</td>
        </tr>
        <tr>
          <td id="zdp-day-1-10" class="zdp-active-cell">10</td>
          <td id="zdp-day-1-11" class="zdp-active-cell">11</td>
          <td id="zdp-day-1-12" class="zdp-active-cell">12</td>
          <td id="zdp-day-1-13" class="zdp-active-cell">13</td>
          <td id="zdp-day-1-14" class="zdp-active-cell">14</td>
          <td id="zdp-day-1-15" class="zdp-active-cell">15</td>
          <td id="zdp-day-1-16" class="zdp-active-cell">16</td>
        </tr>
        <tr>
          <td id="zdp-day-1-17" class="zdp-active-cell">17</td>
          <td id="zdp-day-1-18" class="zdp-active-cell">18</td>
          <td id="zdp-day-1-19" class="zdp-active-cell">19</td>
          <td id="zdp-day-1-20" class="zdp-active-cell">20</td>
          <td id="zdp-day-1-21" class="zdp-active-cell">21</td>
          <td id="zdp-day-1-22" class="zdp-active-cell">22</td>
          <td id="zdp-day-1-23" class="zdp-active-cell">23</td>
        </tr>
        <tr>
          <td id="zdp-day-1-24" class="zdp-active-cell">24</td>
          <td id="zdp-day-1-25" class="zdp-active-cell">25</td>
          <td id="zdp-day-1-26" class="zdp-active-cell">26</td>
          <td id="zdp-day-1-27" class="zdp-active-cell">27</td>
          <td id="zdp-day-1-28" class="zdp-active-cell">28</td>
          <td id="zdp-day-1-29" class="zdp-active-cell">29</td>
          <td id="zdp-day-1-30" class="zdp-active-cell">30</td>
        </tr>
        <tr>
          <td id="zdp-day-1-31" class="zdp-active-cell">31</td>
          <td class="zdp-empty-cell">&nbsp;</td>
          <td class="zdp-empty-cell">&nbsp;</td>
          <td class="zdp-empty-cell">&nbsp;</td>
          <td class="zdp-empty-cell">&nbsp;</td>
          <td class="zdp-empty-cell">&nbsp;</td>
          <td class="zdp-empty-cell">&nbsp;</td>
        </tr>
      </tbody>
    </table>

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    Document Tags and Contributors

    Contributors to this page: wbamberg, fusionchess
    Last updated by: wbamberg,
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