autocomplete.js

最新推荐文章于 2024-08-31 10:03:41 发布

什么都不能

最新推荐文章于 2024-08-31 10:03:41 发布

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分类专栏： javascript 文章标签： autocomplete function null table object input

本文链接：https://blog.youkuaiyun.com/hanpoyangtitan/article/details/4142687

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这是一个关于如何使用javascript实现自动补全功能的代码示例。通过AutoComplete函数，可以为输入框添加自动补全功能，根据用户输入的内容动态过滤数据，并显示匹配项。示例中展示了如何处理数据、创建补全面板、根据用户按键行为进行操作等核心功能。

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<html>
<head>
  <script>
/**
* autocomplete ??
* ?????IE 6
* @param textField            ????
* @param valueField           ???
* @param data                 ????
* @param showField            ??????????????key
* @param comparedField        ??????????????key
* @param comparedValueField   ????????????key
* @param filterField          ????????????key
* @param filterValue          ??????
* @return
* @author ex-hantao001
*/
function AutoComplete(textField, valueField, data, showField, comparedField, comparedValueField, filterField, filterValue){
    this.textField = typeof(textField) == "object"?textField:document.getElementById(textField);
    this.valueField = typeof(valueField) == "object"?valueField:document.getElementById(valueField);
    this.tempData = null;
    this.dataPanel = null;
    this.data = data;
    this.filterField = filterField;
    this.tilterValue = filterValue;
    this.showField = showField;
    this.comparedField = comparedField;
    this.comparedValueField = comparedValueField;
    this.selectedIndex = -1;
    this.init();
}
/**
*???
*/
AutoComplete.prototype.init = function(){
this.selectedIndex = -1;
    if(this.textField == null || this.data == null){
     return;
}
if(this.filterField != null)this.data = this.filter(this.data, this.filterField, this.filterValue);
this.createPanel();
    var autoComplete = this;
    autoComplete.compare(this.comparedField, this.comparedValueField);

    this.textField.onkeyup = function(){
        autoComplete.compare(autoComplete.comparedField, autoComplete.comparedValueField);
         //up 38 down 40
        if(event.keyCode == 40){
        var table = document.getElementById("container");
        if(autoComplete.selectedIndex+1 < table.rows.length){
          autoComplete.selectedIndex++;
          table.rows[autoComplete.selectedIndex].cells[0].style.backgroundColor = "yellow";
        }
        }else if(event.keyCode == 38){
        var table = document.getElementById("container");
        if(autoComplete.selectedIndex - 1 > -1 ) {
          autoComplete.selectedIndex--;
          table.rows[autoComplete.selectedIndex].cells[0].style.backgroundColor = "yellow";
        }
        }
    }

    // ??? ?????????????????
    document.onkeydown = function(){
    var table = document.getElementById("container");
    if(event.keyCode == 13){
        autoComplete.valueField.value = table.rows[autoComplete.selectedIndex].cells[0].getAttribute(autoComplete.comparedValueField);
        autoComplete.valueField.focus();
        document.getElementById("dataPanel").style.height = 0;
        event.keyCode = 0;
        event.returnValue = "return false";
        event.cancelBubble = true;
        return false;
        }
        if(event.keyCode == 27){
        document.getElementById("dataPanel").style.display = "none";
        }
    }

}

/*
* ??
*/
AutoComplete.prototype.filter = function(data, field, value){
    var newArray = [];
    for(var i = 0; i < data.length; i++) {
      if(data[i][field].trim() == value){
          newArray.push(data[i]);
      }
    }
    return newArray;
}

/*
* ?????????
*/
AutoComplete.prototype.getXy = function(targetObj){
    var field = targetObj;
    if(!field){
        alert("???????");
        return;
    }

    var _offX = field.offsetLeft;
    var _offY = field.offsetTop;

    var obj = field;

    while(obj = obj.offsetParent){
        _offX += obj.offsetLeft;
        _offY += obj.offsetTop;
    }
    _offY += field.offsetHeight+2;
    return {x:_offX ,y:_offY};

}

/*
* ??????
*/
AutoComplete.prototype.createPanel = function() {
if(document.getElementById("dataPanel") != null) {
       document.getElementById("dataPanel").style.display = "block";
       document.getElementById("dataPanel").style.top = 0;
       document.getElementById("dataPanel").style.left = 0;
       return;
}
    this.dataPanel = document.createElement("div");
    this.dataPanel.id = "dataPanel";
    this.dataPanel.style.cssText = "width:150px; height:300px; overflow-y:auto; position:absolute; top:0px; left:0px; background:red";
    document.body.appendChild(this.dataPanel);
    var container = document.createElement("table");
    container.id = "container";
    container.width = "100%";
    this.dataPanel.appendChild(container);
}

/*
* ??
*/
AutoComplete.prototype.compare = function(f, v){
    var _x = this.getXy(this.textField).x + 150 > parseInt(document.body.scrollWidth) ? this.getXy(this.textField).x - (150 - parseInt(this.textField.offsetWidth)) : this.getXy(this.textField).x;
    var _y = this.getXy(this.textField).y;
    document.getElementById("dataPanel").style.left = _x;
    document.getElementById("dataPanel").style.top = _y;
    var arr = this.data;
    this.tempData = [];
    var isExist = false;
    var tbl = document.getElementById("container");
    for(var i = tbl.rows.length-1; i >= 0 ; i--){
    tbl.deleteRow(i);
    }

    for(var i = 0; i < arr.length; i++){
        if(arr[i][f].trim().length > this.textField.value.trim().length && arr[i][f].indexOf(this.textField.value.trim()) == 0) {
            this.append(arr[i],this.showField,v);
            isExist = true;
        }
    }
    document.getElementById("dataPanel").style.height = document.getElementById("container").offsetHeight
    if(!isExist) document.getElementById("dataPanel").style.height = 0;
}

/*
* ??????
*/
AutoComplete.prototype.append = function(data, textName, valueName){
    if(!data)return;
    var autoComplete = this;
    for(var i = 0; i < this.tempData.length; i++){
    if(data[valueName] == this.tempData[i][valueName]) {
         return;
    }

    }

    var tbl = document.getElementById("container");
    tbl.style.cssText = "background-color:#FFF;";
    tbl.width = "100%";
    var row = tbl.insertRow(-1);
    var cell = row.insertCell(-1);
    cell.width = "100%"

    cell.style.cssText = row.rowIndex%2 == 1 ? "background-color:#EEE;border-bottom:1px dashed #EEE;":"background-color:#FFF; border-bottom:1px dashed #EEE;";
    cell.onmouseover = function(){
    for(var i = 0; i < tbl.rows.length; i++){
      var td = tbl.rows[i].cells[0];
      td.style.backgroundColor = i%2 == 1 ? "#EEE" : "#FFF";
    }
        this.style.cursor = "pointer";
        this.style.backgroundColor = "yellow";
        autoComplete.selectedIndex = this.parentNode.rowIndex;
    }
    cell.onmouseout = function(){
        this.style.cursor = "default";
        this.style.backgroundColor = row.rowIndex%2 == 1 ? "#EEE" : "#FFF";
    }

    cell.onmousedown = function(){
       autoComplete.textField.value = data[textName];
       if(valueName != null && data[valueName] != null)
       if(autoComplete.valueField)autoComplete.valueField.value = data[valueName];
       document.getElementById("dataPanel").style.display = "none";
    }
    cell.setAttribute(valueName,data[valueName]);
    cell.innerHTML = data[textName];
    this.tempData.push(data);
    if(parseInt(tbl.offsetHeight) > 300){
    document.getElementById("dataPanel").style.border = "1px solid #000";
    tbl.style.border = "0px";
    }else{
    document.getElementById("dataPanel").style.border = "0";
    tbl.style.border = "1px solid #000";
    }

}

/*
* ????????
*/
AutoComplete.prototype.getValueOfText = function(data, text, comparedField, comparedValueField) {
    if(!data) return;
    for(var i = 0; i < data.length; i++) {
        if(data[i][comparedField] == text)return data[i][comparedValueField];
    }
}

String.prototype.trim = function(){
return this.replace(/^/s+|/s+$/g,this);
}

function debug(s){
document.body.insertAdjacentHTML("BeforeEnd","debug:"+s+"<br>");
}

var datas = [
   {"a":'??1 | 001',b:'001',c:"a"},
   {"a":'??2 | 002',b:'002',c:"a"},
   {"a":'??3 | 003',b:'003',c:"a"},
   {"a":'??4 | 004',b:'004',c:"a"},
   {"a":'??1 | 1001',b:'1001',c:"b"},
   {"a":'??2 | 1002',b:'1002',c:"b"},
   {"a":'??3 | 1003',b:'1003',c:"b"}

];

String.prototype.trim = function(){
return this.replace(/^/s+|/s+$/g,this);
}

function debug(s){
document.body.insertAdjacentHTML("BeforeEnd","debug:"+s+"<br>");
}

var ac = new AutoComplete();
function aa(obj) {
   ac.textField= obj
   ac.valueField = obj
   ac.data = datas;
   ac.showField = "a";
   ac.comparedField = "b";
   ac.comparedValueField = "b";
   ac.filterField = "c";
   ac.filterValue = "a";
   ac.init();
}

</script>
</head>
<body>
<form name="f1">
<input type="text" id="no1" value="" onfocus="aa(this)" />
<input type="text" name="val" />
</form>
</body>
</html>