common.js

尚学堂科技JAVA系列教程之JAVA系列BBS_2007的讲解源代码

      var rDiv = roomWin.document.getElementById('rtext');
      var numChildren = rDiv.childNodes.length;
      if(numChildren > 0){
        return rDiv.childNodes[0];
      }
      return null;
}

function hasPeople(roomWin){
  // The div to write to:
      var rDiv = roomWin.document.getElementById('rtext');
      var numChildren = rDiv.childNodes.length;
      if(numChildren > 0){
        return true;
      }
      return false;
}


function insertText(yakWin, text){
    // The div to write to:
    var yakDiv = yakWin.document.getElementById('ytext');

    // Create a new span node in the yakDiv. Record the num of nodes right now - used later
    // to see if the node was really added:
    var chatLineDiv = yakWin.document.createElement("div");
    chatLineDiv.setAttribute("class", "private-message");

    try {
        chatLineDiv.innerHTML = "<span class='private-message'>"+text+"</span>";
        yakDiv.appendChild(chatLineDiv);
    }
    catch (exception) {
    }
}

function insertHistoryText(yakWin, text){
    // The div to write to:
    var yakDiv = yakWin.document.getElementById('ytext');

    // Create a new span node in the yakDiv. Record the num of nodes right now - used later
    // to see if the node was really added:
    var chatLineDiv = yakWin.document.createElement("div");
    chatLineDiv.setAttribute("class", "history-message");

    try {
        chatLineDiv.innerHTML = "<span class='history-message'>"+text+"</span>";
        yakDiv.appendChild(chatLineDiv);
    }
    catch (exception) {
    }
}

function insertErrorText(yakWin, text){
    // The div to write to:
    var yakDiv = yakWin.document.getElementById('ytext');

    // Create a new span node in the yakDiv. Record the num of nodes right now - used later
    // to see if the node was really added:
    var chatLineDiv = yakWin.document.createElement("div");
    chatLineDiv.setAttribute("class", "error-message");

    try {
        chatLineDiv.innerHTML = "<span class='error-message'>"+text+"</span>";
        yakDiv.appendChild(chatLineDiv);
    }
    catch (exception) {
    }
}

function clearChat(yakWin){
   // The div to write to:
    var yakDiv = yakWin.document.getElementById('ytext');
    var numChildren = yakDiv.childNodes.length;
    for(i=0;i<numChildren;i++){
      var chatLineDiv = yakDiv.childNodes[i];
      yakDiv.removeChild(chatLineDiv);
      numChildren = yakDiv.childNodes.length;
      if(numChildren == 0){
        return;
      }
    }
}

function addChatText(yakWin, from, text) {
    // The div to write to:
    var yakDiv = yakWin.document.getElementById('ytext');

    // This will be an announcement if there is no from passed in
    var isAnnouncement = (from == "");

    // Create a new span node in the yakDiv. Record the num of nodes right now - used later
    // to see if the node was really added:
    var numChildren = yakDiv.childNodes.length;
    var nameSpan = document.createElement("span");
    var textSpan = document.createElement("span");

    if (isAnnouncement) {
        nameSpan.setAttribute("class", "chat-announcement");
        textSpan.setAttribute("class", "chat-announcement");
    }
    else {
        textSpan.setAttribute("class", "text");
    }

    // add another span containing the username if this is not an announcement:
    var fromIsCurrentUser = false;
    if (!isAnnouncement) {
        // is the from the same as the current user?
        fromIsCurrentUser = (nickname == from);

        if (fromIsCurrentUser) {
            nameSpan.setAttribute("class", "client-name");
        }
        else {
            nameSpan.setAttribute("class", "operator-name");
        }
    }

    var chatLineDiv = document.createElement("div");
    chatLineDiv.setAttribute("class", "chat-line");

    var appendFailed = false;
    try {

        if (!isAnnouncement) {
            nameSpan.innerHTML = from + ": ";
            chatLineDiv.appendChild(nameSpan);
        }

        textSpan.innerHTML = text;
        chatLineDiv.appendChild(textSpan);

        yakDiv.appendChild(chatLineDiv);
    }
    catch (exception) {
        appendFailed = true;
    }

    if (!appendFailed) {
        // Make sure the browser appended:
        appendFailed = (numChildren == yakDiv.childNodes.length);
    }

    if (appendFailed) {
        var inn = yakDiv.innerHTML;
        inn += "<div class=\"chat-line\">";

        if (!isAnnouncement) {
            inn += "<span class=\"";
            if (isAnnouncement) {
                inn += "chat-announcement";
            }
            else if (fromIsCurrentUser) {
                inn += "client-name";
            }
            else {
                inn += "operator-name";
            }

            inn += "\">" + from + ": </span>";
            // yakDiv.innerHTML = inn;
        }

        // var inn = yakDiv.innerHTML;

        inn += "<span class=\"";
        inn += (isAnnouncement ? "chat-announcement\">" : "chat_text\">");
        inn += text + "</span></div>";

        yakDiv.innerHTML = inn;
    }
    else {
        // yakDiv.appendChild(document.createElement("br"));
    }
}


function addChatTextAndDate(yakWin, date, from, text) {
    // The div to write to:
    var yakDiv = yakWin.document.getElementById('ytext');

    // This will be an announcement if there is no from passed in
    var isAnnouncement = (from == "");

    // Create a new span node in the yakDiv. Record the num of nodes right now - used later
    // to see if the node was really added:
    var numChildren = yakDiv.childNodes.length;
    var nameSpan = document.createElement("span");
    var textSpan = document.createElement("span");

    if (isAnnouncement) {
        nameSpan.setAttribute("class", "chat-announcement");
        textSpan.setAttribute("class", "chat-announcement");
    }
    else {
        textSpan.setAttribute("class", "text");
    }

    // add another span containing the username if this is not an announcement:
    var fromIsCurrentUser = false;
    if (!isAnnouncement) {
        // is the from the same as the current user?
        fromIsCurrentUser = (nickname == from);

        if (fromIsCurrentUser) {
            nameSpan.setAttribute("class", "client-name");
        }
        else {
            nameSpan.setAttribute("class", "operator-name");
        }
    }

    if(!isAnnouncement && !fromIsCurrentUser){
        var encodedFrom = escape(from);
          from = "<a class=\"operator-name\" href=javascript:parent.openIM('"+encodedFrom+"')> "+from+"</a>";
    }



    var chatLineDiv = document.createElement("div");
    chatLineDiv.setAttribute("class", "chat-line");

    var appendFailed = false;
    try {

        if (!isAnnouncement) {
            nameSpan.innerHTML = date+" "+from + ": ";
            chatLineDiv.appendChild(nameSpan);
        }

        textSpan.innerHTML = text;
        chatLineDiv.appendChild(textSpan);

        yakDiv.appendChild(chatLineDiv);
    }
    catch (exception) {
        appendFailed = true;
    }

    if (!appendFailed) {
        // Make sure the browser appended:
        appendFailed = (numChildren == yakDiv.childNodes.length);
    }

    if (appendFailed) {
        var inn = yakDiv.innerHTML;
        inn += "<div class=\"chat-line\">";

        if (!isAnnouncement) {
            inn += "<span class=\"";
            if (isAnnouncement) {
                inn += "chat-announcement";
            }
            else if (fromIsCurrentUser) {
                inn += "client-name";
            }
            else {
                inn += "operator-name";
            }

            inn += "\">" + date+ " "+from + ": </span>";
            // yakDiv.innerHTML = inn;
        }

        // var inn = yakDiv.innerHTML;

        inn += "<span class=\"";
        inn += (isAnnouncement ? "chat-announcement\">" : "chat_text\">");
        inn += text + "</span></div>";

        yakDiv.innerHTML = inn;
    }
    else {
        // yakDiv.appendChild(document.createElement("br"));
    }
}


function addHistoryText(yakWin, date, from, text) {
    // The div to write to:
    var yakDiv = yakWin.document.getElementById('ytext');

    // This will be an announcement if there is no from passed in
    var isAnnouncement = (from == "" || from == null);

    // Create a new span node in the yakDiv. Record the num of nodes right now - used later
    // to see if the node was really added:
    var numChildren = yakDiv.childNodes.length;
    var nameSpan = document.createElement("span");
    var textSpan = document.createElement("span");
    nameSpan.setAttribute("class", "history-message");
    textSpan.setAttribute("class", "chat-line");



    // add another span containing the username if this is not an announcement:
    var fromIsCurrentUser = false;
    if (!isAnnouncement) {
        // is the from the same as the current user?
        fromIsCurrentUser = (nickname == from);
    }
    else {
        textSpan.setAttribute("class", "history-message");
    }

    var chatLineDiv = document.createElement("div");

    var appendFailed = false;
    try {

        if (!isAnnouncement) {
            nameSpan.innerHTML = date+" "+from + ": ";
            chatLineDiv.appendChild(nameSpan);
        }

        textSpan.innerHTML = text;
        chatLineDiv.appendChild(textSpan);

        yakDiv.appendChild(chatLineDiv);
    }
    catch (exception) {
        appendFailed = true;
    }

    if (!appendFailed) {
        // Make sure the browser appended:
        appendFailed = (numChildren == yakDiv.childNodes.length);
    }

    if (appendFailed) {
        var inn = yakDiv.innerHTML;
        inn += "<div class=\"history-message\">";

        if (!isAnnouncement) {
            inn += "<span class=\"";
            if (isAnnouncement) {
                inn += "history-message";
            }
            else if (fromIsCurrentUser) {
                inn += "history-message";
            }
            else {
                inn += "history-message";
            }

            inn += "\">" + date+" "+from + ": </span>";
            // yakDiv.innerHTML = inn;
        }

        // var inn = yakDiv.innerHTML;

        inn += "<span class=\"";
        inn += (isAnnouncement ? "history-message\">" : "history-message\">");
        inn += text + "</span></div>";

        yakDiv.innerHTML = inn;
    }

}



function addPrivateMessage(yakWin, from, text) {
    // The div to write to:
    var yakDiv = yakWin.document.getElementById('ytext');
    var lineDiv = yakWin.document.createElement("div");
    var isCurrentUser = (nickname == from);
    // This will be an announcement if there is no from passed in
    var newMessage = "<table width=100%>";

    var participant = escape(from);
    var link = "<a href=javascript:parent.openIM('"+participant+"')><b><u>"+text+"</b></u></a><br/>";

  

    newMessage += "<tr><td class=private-message colspan=2>Private Message from " + from + " (Click to join)</td></tr>";
    newMessage += "<tr height=1><td colspan=2 bgcolor=#d3d5d6 height=1></td></tr>";
    newMessage += "<tr><td colspan=2 class=chat-line>" + link + "</td></tr>";

    newMessage += "</table>";

    lineDiv.innerHTML = newMessage;
    yakDiv.appendChild(lineDiv);
}

function scrollYakToEnd (yakWin) {
    var endDiv = yakWin.document.getElementById('enddiv');
    yakWin.scrollTo(0, yakWin.document.body.scrollHeight);
}

function scroll(yakWin){
 yakWin.scrollBy(0, 40);
}