autocomplete-debug.js

来自「国外很不错的一个开源OA系统Group-Office」· JavaScript 代码 · 共 2,080 行 · 第 1/5 页

YAHOO.widget.AutoComplete.prototype._queryInterval = null;

/**
 * Internal tracker to last known textbox value, used to determine whether or not
 * to trigger a query via interval for certain IME users.
 *
 * @event _sLastTextboxValue
 * @type String
 * @private
 */
YAHOO.widget.AutoComplete.prototype._sLastTextboxValue = null;

/////////////////////////////////////////////////////////////////////////////
//
// Private methods
//
/////////////////////////////////////////////////////////////////////////////

/**
 * Updates and validates latest public config properties.
 *
 * @method __initProps
 * @private
 */
YAHOO.widget.AutoComplete.prototype._initProps = function() {
    // Correct any invalid values
    var minQueryLength = this.minQueryLength;
    if(isNaN(minQueryLength) || (minQueryLength < 1)) {
        minQueryLength = 1;
    }
    var maxResultsDisplayed = this.maxResultsDisplayed;
    if(isNaN(this.maxResultsDisplayed) || (this.maxResultsDisplayed < 1)) {
        this.maxResultsDisplayed = 10;
    }
    var queryDelay = this.queryDelay;
    if(isNaN(this.queryDelay) || (this.queryDelay < 0)) {
        this.queryDelay = 0.5;
    }
    var aDelimChar = (this.delimChar) ? this.delimChar : null;
    if(aDelimChar) {
        if(typeof aDelimChar == "string") {
            this.delimChar = [aDelimChar];
        }
        else if(aDelimChar.constructor != Array) {
            this.delimChar = null;
        }
    }
    var animSpeed = this.animSpeed;
    if((this.animHoriz || this.animVert) && YAHOO.util.Anim) {
        if(isNaN(animSpeed) || (animSpeed < 0)) {
            animSpeed = 0.3;
        }
        if(!this._oAnim ) {
            oAnim = new YAHOO.util.Anim(this._oContainer._oContent, {}, this.animSpeed);
            this._oAnim = oAnim;
        }
        else {
            this._oAnim.duration = animSpeed;
        }
    }
    if(this.forceSelection && this.delimChar) {
        YAHOO.log("The forceSelection feature has been enabled with delimChar defined.","warn", this.toString());
    }
};

/**
 * Initializes the results container helpers if they are enabled and do
 * not exist
 *
 * @method _initContainerHelpers
 * @private
 */
YAHOO.widget.AutoComplete.prototype._initContainerHelpers = function() {
    if(this.useShadow && !this._oContainer._oShadow) {
        var oShadow = document.createElement("div");
        oShadow.className = "yui-ac-shadow";
        this._oContainer._oShadow = this._oContainer.appendChild(oShadow);
    }
    if(this.useIFrame && !this._oContainer._oIFrame) {
        var oIFrame = document.createElement("iframe");
        oIFrame.src = this._iFrameSrc;
        oIFrame.frameBorder = 0;
        oIFrame.scrolling = "no";
        oIFrame.style.position = "absolute";
        oIFrame.style.width = "100%";
        oIFrame.style.height = "100%";
        oIFrame.tabIndex = -1;
        this._oContainer._oIFrame = this._oContainer.appendChild(oIFrame);
    }
};

/**
 * Initializes the results container once at object creation
 *
 * @method _initContainer
 * @private
 */
YAHOO.widget.AutoComplete.prototype._initContainer = function() {
    if(!this._oContainer._oContent) {
        // The oContent div helps size the iframe and shadow properly
        var oContent = document.createElement("div");
        oContent.className = "yui-ac-content";
        oContent.style.display = "none";
        this._oContainer._oContent = this._oContainer.appendChild(oContent);

        var oHeader = document.createElement("div");
        oHeader.className = "yui-ac-hd";
        oHeader.style.display = "none";
        this._oContainer._oContent._oHeader = this._oContainer._oContent.appendChild(oHeader);

        var oBody = document.createElement("div");
        oBody.className = "yui-ac-bd";
        this._oContainer._oContent._oBody = this._oContainer._oContent.appendChild(oBody);

        var oFooter = document.createElement("div");
        oFooter.className = "yui-ac-ft";
        oFooter.style.display = "none";
        this._oContainer._oContent._oFooter = this._oContainer._oContent.appendChild(oFooter);
    }
    else {
        YAHOO.log("Could not initialize the container","warn",this.toString());
    }
};

/**
 * Clears out contents of container body and creates up to
 * YAHOO.widget.AutoComplete#maxResultsDisplayed &lt;li&gt; elements in an
 * &lt;ul&gt; element.
 *
 * @method _initList
 * @private
 */
YAHOO.widget.AutoComplete.prototype._initList = function() {
    this._aListItems = [];
    while(this._oContainer._oContent._oBody.hasChildNodes()) {
        var oldListItems = this.getListItems();
        if(oldListItems) {
            for(var oldi = oldListItems.length-1; oldi >= 0; i--) {
                oldListItems[oldi] = null;
            }
        }
        this._oContainer._oContent._oBody.innerHTML = "";
    }

    var oList = document.createElement("ul");
    oList = this._oContainer._oContent._oBody.appendChild(oList);
    for(var i=0; i<this.maxResultsDisplayed; i++) {
        var oItem = document.createElement("li");
        oItem = oList.appendChild(oItem);
        this._aListItems[i] = oItem;
        this._initListItem(oItem, i);
    }
    this._maxResultsDisplayed = this.maxResultsDisplayed;
};

/**
 * Initializes each &lt;li&gt; element in the container list.
 *
 * @method _initListItem
 * @param oItem {HTMLElement} The &lt;li&gt; DOM element.
 * @param nItemIndex {Number} The index of the element.
 * @private
 */
YAHOO.widget.AutoComplete.prototype._initListItem = function(oItem, nItemIndex) {
    var oSelf = this;
    oItem.style.display = "none";
    oItem._nItemIndex = nItemIndex;

    oItem.mouseover = oItem.mouseout = oItem.onclick = null;
    YAHOO.util.Event.addListener(oItem,"mouseover",oSelf._onItemMouseover,oSelf);
    YAHOO.util.Event.addListener(oItem,"mouseout",oSelf._onItemMouseout,oSelf);
    YAHOO.util.Event.addListener(oItem,"click",oSelf._onItemMouseclick,oSelf);
};

/**
 * Enables interval detection for  Korean IME support.
 *
 * @method _onIMEDetected
 * @param oSelf {Object} The AutoComplete instance.
 * @private
 */
YAHOO.widget.AutoComplete.prototype._onIMEDetected = function(oSelf) {
    oSelf._enableIntervalDetection();
};

/**
 * Enables query triggers based on text input detection by intervals (rather
 * than by key events).
 *
 * @method _enableIntervalDetection
 * @private
 */
YAHOO.widget.AutoComplete.prototype._enableIntervalDetection = function() {
    var currValue = this._oTextbox.value;
    var lastValue = this._sLastTextboxValue;
    if(currValue != lastValue) {
        this._sLastTextboxValue = currValue;
        this._sendQuery(currValue);
    }
};


/**
 * Cancels text input detection by intervals.
 *
 * @method _cancelIntervalDetection
 * @param oSelf {Object} The AutoComplete instance.
 * @private
 */
YAHOO.widget.AutoComplete.prototype._cancelIntervalDetection = function(oSelf) {
    if(oSelf._queryInterval) {
        clearInterval(oSelf._queryInterval);
    }
};


/**
 * Whether or not key is functional or should be ignored. Note that the right
 * arrow key is NOT an ignored key since it triggers queries for certain intl
 * charsets.
 *
 * @method _isIgnoreKey
 * @param nKeycode {Number} Code of key pressed.
 * @return {Boolean} True if key should be ignored, false otherwise.
 * @private
 */
YAHOO.widget.AutoComplete.prototype._isIgnoreKey = function(nKeyCode) {
    if ((nKeyCode == 9) || (nKeyCode == 13)  || // tab, enter
            (nKeyCode == 16) || (nKeyCode == 17) || // shift, ctl
            (nKeyCode >= 18 && nKeyCode <= 20) || // alt,pause/break,caps lock
            (nKeyCode == 27) || // esc
            (nKeyCode >= 33 && nKeyCode <= 35) || // page up,page down,end
            (nKeyCode >= 36 && nKeyCode <= 38) || // home,left,up
            (nKeyCode == 40) || // down
            (nKeyCode >= 44 && nKeyCode <= 45)) { // print screen,insert
        return true;
    }
    return false;
};

/**
 * Makes query request to the DataSource.
 *
 * @method _sendQuery
 * @param sQuery {String} Query string.
 * @private
 */
YAHOO.widget.AutoComplete.prototype._sendQuery = function(sQuery) {
    // Widget has been effectively turned off
    if(this.minQueryLength == -1) {
        this._toggleContainer(false);
        return;
    }
    // Delimiter has been enabled
    var aDelimChar = (this.delimChar) ? this.delimChar : null;
    if(aDelimChar) {
        // Loop through all possible delimiters and find the latest one
        // A " " may be a false positive if they are defined as delimiters AND
        // are used to separate delimited queries
        var nDelimIndex = -1;
        for(var i = aDelimChar.length-1; i >= 0; i--) {
            var nNewIndex = sQuery.lastIndexOf(aDelimChar[i]);
            if(nNewIndex > nDelimIndex) {
                nDelimIndex = nNewIndex;
            }
        }
        // If we think the last delimiter is a space (" "), make sure it is NOT
        // a false positive by also checking the char directly before it
        if(aDelimChar[i] == " ") {
            for (var j = aDelimChar.length-1; j >= 0; j--) {
                if(sQuery[nDelimIndex - 1] == aDelimChar[j]) {
                    nDelimIndex--;
                    break;
                }
            }
        }
        // A delimiter has been found so extract the latest query
        if (nDelimIndex > -1) {
            var nQueryStart = nDelimIndex + 1;
            // Trim any white space from the beginning...
            while(sQuery.charAt(nQueryStart) == " ") {
                nQueryStart += 1;
            }
            // ...and save the rest of the string for later
            this._sSavedQuery = sQuery.substring(0,nQueryStart);
            // Here is the query itself
            sQuery = sQuery.substr(nQueryStart);
        }
        else if(sQuery.indexOf(this._sSavedQuery) < 0){
            this._sSavedQuery = null;
        }
    }

    // Don't search queries that are too short
    if (sQuery && (sQuery.length < this.minQueryLength) || (!sQuery && this.minQueryLength > 0)) {
        if (this._nDelayID != -1) {
            clearTimeout(this._nDelayID);
        }
        this._toggleContainer(false);
        return;
    }

    sQuery = encodeURIComponent(sQuery);
    this._nDelayID = -1;    // Reset timeout ID because request has been made
    this.dataRequestEvent.fire(this, sQuery);
    this.dataSource.getResults(this._populateList, sQuery, this);
};

/**
 * Populates the array of &lt;li&gt; elements in the container with query
 * results. This method is passed to YAHOO.widget.DataSource#getResults as a
 * callback function so results from the DataSource instance are returned to the
 * AutoComplete instance.
 *
 * @method _populateList
 * @param sQuery {String} The query string.
 * @param aResults {Array} An array of query result objects from the DataSource.
 * @param oSelf {Object} The AutoComplete instance.
 * @private
 */
YAHOO.widget.AutoComplete.prototype._populateList = function(sQuery, aResults, oSelf) {
    if(aResults === null) {
        oSelf.dataErrorEvent.fire(oSelf, sQuery);
    }
    if (!oSelf._bFocused || !aResults) {
        return;
    }

    var isOpera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1);
    var contentStyle = oSelf._oContainer._oContent.style;
    contentStyle.width = (!isOpera) ? null : "";
    contentStyle.height = (!isOpera) ? null : "";

    var sCurQuery = decodeURIComponent(sQuery);
    oSelf._sCurQuery = sCurQuery;
    oSelf._bItemSelected = false;

    if(oSelf._maxResultsDisplayed != oSelf.maxResultsDisplayed) {
        oSelf._initList();
    }

    var nItems = Math.min(aResults.length,oSelf.maxResultsDisplayed);
    oSelf._nDisplayedItems = nItems;
    if (nItems > 0) {
        oSelf._initContainerHelpers();
        var aItems = oSelf._aListItems;

        // Fill items with data
        for(var i = nItems-1; i >= 0; i--) {
            var oItemi = aItems[i];
            var oResultItemi = aResults[i];
            oItemi.innerHTML = oSelf.formatResult(oResultItemi, sCurQuery);
            oItemi.style.display = "list-item";
            oItemi._sResultKey = oResultItemi[0];
            oItemi._oResultData = oResultItemi;

        }

        // Empty out remaining items if any
        for(var j = aItems.length-1; j >= nItems ; j--) {
            var oItemj = aItems[j];
            oItemj.innerHTML = null;
            oItemj.style.display = "none";
            oItemj._sResultKey = null;
            oItemj._oResultData = null;
        }

        if(oSelf.autoHighlight) {
            // Go to the first item
            var oFirstItem = aItems[0];
            oSelf._toggleHighlight(oFirstItem,"to");
            oSelf.itemArrowToEvent.fire(oSelf, oFirstItem);
            oSelf._typeAhead(oFirstItem,sQuery);
        }
        else {
            oSelf._oCurItem = null;
        }

        // Expand the container
        var ok = oSelf.doBeforeExpandContainer(oSelf._oTextbox, oSelf._oContainer, sQuery, aResults);
        oSelf._toggleContainer(ok);
    }
    else {
        oSelf._toggleContainer(false);
    }
    oSelf.dataReturnEvent.fire(oSelf, sQuery, aResults);
};

/**
 * When forceSelection is true and the user attempts
 * leave the text input box without selecting an item from the query results,
 * the user selection is cleared.
 *
 * @method _clearSelection
 * @private
 */
YAHOO.widget.AutoComplete.prototype._clearSelection = function() {
    var sValue = this._oTextbox.value;
    var sChar = (this.delimChar) ? this.delimChar[0] : null;
    var nIndex = (sChar) ? sValue.lastIndexOf(sChar, sValue.length-2) : -1;
    if(nIndex > -1) {
        this._oTextbox.value = sValue.substring(0,nIndex);
    }
    else {
         this._oTextbox.value = "";
    }
    this._sSavedQuery = this._oTextbox.value;

    // Fire custom event
    this.selectionEnforceEvent.fire(this);
};

/**
 * Whether or not user-typed value in the text input box matches any of the
 * query results.
 *