AjaMyJSON.js source listing

/***
 **  AjaMyAjax --> JSON functions library
 **  use with the core AJAX lib routines in ajaMyCore.js.
 **
 **  This software provided "AS IS," but is FREE to use and share.
 **  For details see the as-is doc and Creative Commons license:
 **  http://creativecommons.org/licenses/by-sa/3.0/
 **
 **  See doc.txt or examples.html for syntax and more info at
 **  http://AjaMyAjax.com, (c) Mark Omohundro
 */

pbJSONLibReady = true; // notifies core that lib is available

var pbJSONLibHeader = "[AjaMyAjax JSON Lib]";

this.processJSON = function() {
  var jsonData = (arguments[0]) ? arguments[0] : null;
  var strcontainer = (arguments[1]) ? arguments[1] : null;
  var strSearchElement = (arguments[2]) ? arguments[2] : null;
  var stroutputFormat = (arguments[3]) ? arguments[3] : null;

  if (jsonData) {
    // search for a specific element by passed parameter
    // note this is a native JavaScript JSON text parser...
    if (strSearchElement) {
      // remove quotes and bracketing tick marks only
      var srchkey = strSearchElement.replace(/(^'|'$|")/g, "");

      if (!srchkey) {
        aja_empty(strcontainer);
        if (pbshowAlertMsgs) {
          aja_alertMsg(pbJSONLibHeader, "Invalid search key parameter");
        }
        return;
      }

      // if search string has any quotes, use "as is" for a case sensitive comparison
      // (example, pass a string parameter like this for an exact match: '"myString"')
      if (srchkey !== strSearchElement) {
        var srchtmp = jsonData;
      }
      else {
        // otherwise, will find any match
        var srchtmp = jsonData.toLowerCase();
        var srchkey = strSearchElement.toLowerCase();
      }
      var offset = srchtmp.indexOf(srchkey);

      if (offset == -1) {
        aja_empty(strcontainer);
        if (pbshowAlertMsgs) {
          aja_alertMsg(pbJSONLibHeader, "Sorry, cannot retrieve data requested: " + strSearchElement);
        }
        return;
      }

      var jsonhash = "";
      var jsontmp = jsonData;
      while (offset != -1) {
        var datastart = offset, dataend = offset;

        // find start/end of each name/value pair
        while (datastart >= 0) {
          if (jsontmp.charAt(datastart) == '{') {
            break;
          }
          else datastart--;
        }
        var jsontmplen = jsontmp.length;
        while (dataend < jsontmplen) {
          if (jsontmp.charAt(dataend) == '}') {
            break;
          }
          else dataend++;
        }

        if (dataend > datastart && dataend > 0) {
          jsonhash += "{" + jsontmp.substr(datastart + 1, dataend - datastart - 1) + "}";
        }
        offset = srchtmp.indexOf(srchkey, dataend + 1);
      }
      // search results now a data subset to transform below
      jsonData = jsonhash;

      // clean up:
      jsonhash = null;
      jsontmp = null;
      srchkey = null;
      srchtmp = null;
      offset = null;
      datastart = null;
      dataend = null;
    }

    jsonData = json_addAnchorTags(jsonData);

    if (stroutputFormat == "HTABLE" || stroutputFormat == "VTABLE" || stroutputFormat == "ULIST") {
      // try to format json data into a clean table,
      // but there are many possible data formats..
      var tablehdr = "<table id='myTableID'>";
      if (!strSearchElement) {
        var lbracket = jsonData.indexOf("[");
        if (lbracket > 0) {
          tablehdr += "<th id='myHeaderID'>";
          jsonData = jsonData.replace(/\[/, "</th><tr id='myRowID'>");
        }
        else {
          jsonData = jsonData.replace(/\[/g, "<tr id='myRowID'>");
          jsonData = jsonData.replace(/\]/g, "</tr>");
        }
        if (jsonData.substr(0,1) == "{") {
          jsonData = tablehdr + jsonData.substr(1, jsonData.length);
          jsonData = jsonData.substr(0, jsonData.length-1) + "</table>";
        }
        else {
          jsonData = tablehdr + jsonData + "</table>";
        }
      }
      else {
        jsonData = tablehdr + "<tr id='myRowID'>" + jsonData + "</tr></table>";
      }
      jsonData = jsonData.replace(/\[/g, "<tr id='myRowID'>");
      jsonData = jsonData.replace(/\]/g, "</tr>");
      jsonData = jsonData.replace(/\{/g, "<td>");
      jsonData = jsonData.replace(/\}/g, "</td>");
      jsonData = jsonData.replace(/[:,"]/g, "");
      tablehdr = null;

      if (stroutputFormat == "VTABLE") {
        jsonData = jsonData.replace(/\<tr\>/g, "");
        jsonData = jsonData.replace(/\<\/tr\>/g, "");
        jsonData = jsonData.replace(/\<td\>/g, "<tr>");
        jsonData = jsonData.replace(/\<\/td\>/g, "</tr>");
      }

      if (stroutputFormat == "ULIST") {
        // then transform into a basic unordered list
        jsonData = jsonData.replace(/(\<table>|\<\/table>)/gi, "");
        jsonData = jsonData.replace(/(\<th id='myHeaderID'>)/gi, "<th>");
        jsonData = jsonData.replace(/(\<tr id='myRowID'>)/gi, "<tr>");
        jsonData = jsonData.replace(/(th>|tr>|td>)/gi, "li>");
        jsonData = jsonData.replace(/\<li\>\<\li\>/gi, "<li>");
        jsonData = jsonData.replace(/\<\/li\>\<\/li\>/gi, "</li>");
        jsonData = jsonData.replace(/\<li\>\<\/li\>/gi, "");
      }
    }
    else {
      // transform json data into ordered text
      jsonData = jsonData.replace(/"\s+},/g, "<br/>");
      jsonData = jsonData.replace(/[{:,"]/g, "");
      jsonData = jsonData.replace(/[\[\]}]/g, "<br/>");
    }

    // transform any tokens used
    jsonData = jsonData.replace(/hypertext-./gi, "http:");

    aja_fill(strcontainer, jsonData);

    // clean up after:
    try {
      if (strcontainer) strcontainer = null;
      if (strSearchElement) strSearchElement = null;
    }
    finally {
      jsonData = null;
    }
  }
}

json_addAnchorTags = function(strmod) {
  if (strmod) {
    var srchtmp = strmod.toLowerCase();
    if (srchtmp.indexOf("href") != -1) {
      // anchor markup already there
      return strmod;
    }

    // finds and adds multiple tags
    var linkstart = srchtmp.indexOf("http:");
    while (linkstart != -1) {
      var linkend = linkstart;
      var jsontmp = strmod;

      // try to find the end of link
      var jsontmplen = jsontmp.length;
      while (linkend < jsontmplen) {
        if (/[ "}]/.test(jsontmp.charAt(linkend))) {
          break;
        }
        else linkend++;
      }
      if (linkend > linkstart && linkend > 0) {
        var stranchor = jsontmp.substr(linkstart, linkend - linkstart);
        jsontmp = jsontmp.replace(stranchor, "<a href='" + stranchor + "'>link</a>");

        // use renamed key tokens to allow add'l anchor tag replaces
        jsontmp = jsontmp.replace(/http:/i, "hypertext-.");
        strmod = jsontmp;
        jsontmp = null;
      }
      else break;

      // start another search...
      srchtmp = strmod.toLowerCase();
      linkstart = srchtmp.indexOf("http:");
    }
    // clean up:
    srchtmp = null;
    linkstart = null;
    linkend = null;
    jsontmp = null;
    stranchor = null;
  }
  return strmod;
}