midori/data/autosuggestcontrol.js
2009-12-24 15:50:19 -08:00

316 lines
9.2 KiB
JavaScript

/**
* An autosuggest textbox control.
* from Nicholas C. Zakas (Author) example: http://www.nczonline.net/
* Adopted for Midori by Alexander V. Butenko <a.butenka@gmail.com>
*/
function AutoSuggestControl(oTextbox /*:HTMLInputElement*/,
oProvider /*:SuggestionProvider*/) {
/**
* The currently selected suggestions.
* @scope private
*/
this.cur /*:int*/ = -1;
/**
* The dropdown list layer.
* @scope private
*/
this.layer = null;
/**
* Suggestion provider for the autosuggest feature.
* @scope private.
*/
this.provider /*:SuggestionProvider*/ = oProvider;
/**
* The textbox to capture.
* @scope private
*/
this.textbox /*:HTMLInputElement*/ = oTextbox;
//initialize the control
this.init();
}
/**
* Autosuggests one or more suggestions for what the user has typed.
* If no suggestions are passed in, then no autosuggest occurs.
* @scope private
* @param aSuggestions An array of suggestion strings.
* @param bTypeAhead If the control should provide a type ahead suggestion.
*/
AutoSuggestControl.prototype.autosuggest = function (aSuggestions /*:Array*/) {
//make sure theres at least one suggestion
if (aSuggestions.length > 0) {
this.showSuggestions(aSuggestions);
} else {
this.hideSuggestions();
}
};
/**
* Creates the dropdown layer to display multiple suggestions.
* @scope private
*/
AutoSuggestControl.prototype.createDropDown = function () {
var oThis = this;
//create the layer and assign styles
this.layer = document.createElement("div");
this.layer.className = "suggestions";
this.layer.style.visibility = "hidden";
this.layer.style.width = this.textbox.offsetWidth;
this.layer.onmousedown =
this.layer.onmouseup =
this.layer.onmouseover = function (oEvent) {
oEvent = oEvent || window.event;
oTarget = oEvent.target || oEvent.srcElement;
if (oEvent.type == "mousedown") {
oThis.textbox.value = oTarget.firstChild.nodeValue;
oThis.hideSuggestions();
} else if (oEvent.type == "mouseover") {
oThis.highlightSuggestion(oTarget);
} else {
oThis.textbox.focus();
}
};
document.body.appendChild(this.layer);
};
/**
* Gets the left coordinate of the textbox.
* @scope private
* @return The left coordinate of the textbox in pixels.
*/
AutoSuggestControl.prototype.getLeft = function () /*:int*/ {
var oNode = this.textbox;
var iLeft = 0;
while(oNode.tagName != "BODY") {
iLeft += oNode.offsetLeft;
oNode = oNode.offsetParent;
}
return iLeft;
};
/**
* Gets the top coordinate of the textbox.
* @scope private
* @return The top coordinate of the textbox in pixels.
*/
AutoSuggestControl.prototype.getTop = function () /*:int*/ {
var oNode = this.textbox;
var iTop = 0;
while(oNode.tagName != "BODY") {
iTop += oNode.offsetTop;
oNode = oNode.offsetParent;
}
return iTop;
};
/**
* Handles three keydown events.
* @scope private
* @param oEvent The event object for the keydown event.
*/
AutoSuggestControl.prototype.handleKeyDown = function (oEvent /*:Event*/) {
switch(oEvent.keyCode) {
case 38: //up arrow
this.previousSuggestion();
break;
case 40: //down arrow
this.nextSuggestion();
break;
case 13: //enter
this.hideSuggestions();
break;
}
};
/**
* Handles keyup events.
* @scope private
* @param oEvent The event object for the keyup event.
*/
AutoSuggestControl.prototype.handleKeyUp = function (oEvent /*:Event*/) {
var iKeyCode = oEvent.keyCode;
//for backspace (8) and delete (46), shows suggestions without typeahead
if (iKeyCode == 8 || iKeyCode == 46) {
this.provider.requestSuggestions(this);
//make sure not to interfere with non-character keys
} else if (iKeyCode < 32 || (iKeyCode >= 33 && iKeyCode < 46) || (iKeyCode >= 112 && iKeyCode <= 123) ) {
//ignore
} else if (oEvent.ctrlKey) {
iKeyCode = 0;
this.hideSuggestions();
} else {
//request suggestions from the suggestion provider with typeahead
this.provider.requestSuggestions(this);
}
};
/**
* Hides the suggestion dropdown.
* @scope private
*/
AutoSuggestControl.prototype.hideSuggestions = function () {
this.layer.style.visibility = "hidden";
};
/**
* Highlights the given node in the suggestions dropdown.
* @scope private
* @param oSuggestionNode The node representing a suggestion in the dropdown.
*/
AutoSuggestControl.prototype.highlightSuggestion = function (oSuggestionNode) {
for (var i=0; i < this.layer.childNodes.length; i++) {
var oNode = this.layer.childNodes[i];
if (oNode == oSuggestionNode) {
oNode.className = "current"
} else if (oNode.className == "current") {
oNode.className = "";
}
}
};
/**
* Initializes the textbox with event handlers for
* auto suggest functionality.
* @scope private
*/
AutoSuggestControl.prototype.init = function () {
//save a reference to this object
var oThis = this;
//assign the onkeyup event handler
this.textbox.onkeyup = function (oEvent) {
//check for the proper location of the event object
if (!oEvent) {
oEvent = window.event;
}
//call the handleKeyUp() method with the event object
oThis.handleKeyUp(oEvent);
};
//assign onkeydown event handler
this.textbox.onkeydown = function (oEvent) {
//check for the proper location of the event object
if (!oEvent) {
oEvent = window.event;
}
//call the handleKeyDown() method with the event object
oThis.handleKeyDown(oEvent);
};
//assign onblur event handler (hides suggestions)
this.textbox.onblur =
this.textbox.onclick = function () {
oThis.hideSuggestions();
};
//create the suggestions dropdown
this.createDropDown();
};
/**
* Highlights the next suggestion in the dropdown and
* places the suggestion into the textbox.
* @scope private
*/
AutoSuggestControl.prototype.nextSuggestion = function () {
var cSuggestionNodes = this.layer.childNodes;
if (cSuggestionNodes.length > 0 && this.cur < cSuggestionNodes.length-1) {
var oNode = cSuggestionNodes[++this.cur];
this.highlightSuggestion(oNode);
this.textbox.value = oNode.firstChild.nodeValue;
}
};
/**
* Highlights the previous suggestion in the dropdown and
* places the suggestion into the textbox.
* @scope private
*/
AutoSuggestControl.prototype.previousSuggestion = function () {
var cSuggestionNodes = this.layer.childNodes;
if (cSuggestionNodes.length > 0 && this.cur > 0) {
var oNode = cSuggestionNodes[--this.cur];
this.highlightSuggestion(oNode);
this.textbox.value = oNode.firstChild.nodeValue;
}
};
/**
* Selects a range of text in the textbox.
* @scope public
* @param iStart The start index (base 0) of the selection.
* @param iLength The number of characters to select.
*/
AutoSuggestControl.prototype.selectRange = function (iStart /*:int*/, iLength /*:int*/) {
if (this.textbox.setSelectionRange) {
this.textbox.setSelectionRange(iStart, iLength);
}
this.textbox.focus();
};
/**
* Builds the suggestion layer contents, moves it into position,
* and displays the layer.
* @scope private
* @param aSuggestions An array of suggestions for the control.
*/
AutoSuggestControl.prototype.showSuggestions = function (aSuggestions /*:Array*/) {
var oDiv = null;
this.layer.innerHTML = ""; //clear contents of the layer
for (var i=0; i < aSuggestions.length; i++) {
oDiv = document.createElement("div");
oDiv.appendChild(document.createTextNode(aSuggestions[i]));
this.layer.appendChild(oDiv);
}
this.layer.style.left = this.getLeft() + "px";
this.layer.style.top = (this.getTop()+this.textbox.offsetHeight) + "px";
this.layer.style.visibility = "visible";
};
/**
* Request suggestions for the given autosuggest control.
* @scope protected
* @param oAutoSuggestControl The autosuggest control to provide suggestions for.
*/
FormSuggestions.prototype.requestSuggestions = function (oAutoSuggestControl /*:AutoSuggestControl*/) {
var aSuggestions = [];
var sTextboxValue = oAutoSuggestControl.textbox.value.toLowerCase();
if (!this.suggestions)
return;
if (!sTextboxValue.length)
return;
//search for matching suggestions
for (var i=0; i < this.suggestions.length; i++) {
if (this.suggestions[i].toLowerCase().indexOf(sTextboxValue) == 0) {
aSuggestions.push(this.suggestions[i]);
}
}
//provide suggestions to the control
oAutoSuggestControl.autosuggest(aSuggestions);
};
function initSuggestions () {
var inputs = document.getElementsByTagName("input");
for (i=0;i<inputs.length;i++)
{
var ename = inputs[i].getAttribute("name");
var eid = inputs[i].getAttribute("id");
if (!ename && eid)
ename=eid;
if (inputs[i].type == "text")
var smth = new AutoSuggestControl(inputs[i], new FormSuggestions(ename));
}
};