动态筛选数据表中选择元素中的值 [英] Dynamic filtering values in select elements in Datatables
问题描述
使用以下代码对 Datatables 中的多次过滤 select 输入进行编码，是否有可能在一个过滤器中进行选择时仅显示其他选择输入中的可用值?更准确地说，在此
构建一个仅包含列的未过滤(可见)值的下拉菜单相对简单.为此，我们使用以下内容:
columns({搜索:'applied'}).data()[index] 大多数复杂性与管理两个下拉列表的相互关联状态有关.加载页面后，将首先使用的下拉列表指定为主要"下拉列表，将另一个指定为第二"下拉列表.每当用户从主下拉列表中选择新值时，我们都必须清除辅助下拉列表；然后应用主下拉过滤器后，我们必须重新构建辅助下拉列表的值.
最终结果是这样
< script type ="text/javascript">/*每个下拉选择都会影响其他下拉菜单中的值*/var primaryColIdx;var secondaryColIdx;$(document).ready(function(){$('#example').DataTable({initComplete:function(){populateDropdowns(this);}})；})；函数populateDropdowns(table){table.api().columns([1,2]).every(function(){var column = this;//console.log("processing col idx"+ column.index());var select = $('< select>< option value ="></option></select>').appendTo($(column.footer()).empty()).on('change'，function(){var dropdown = this;doFilter(table，dropdown，column);rebuildSecondaryDropdown(table，column.index());})；column.data().unique().sort().each(function(val，idx){select.append('< option value ='+ val +'">'+ val +'</option>')})；})；}函数doFilter(table，dropdown，column){//第一次使用下拉菜单时，它将成为主要下拉菜单.这//在刷新页面之前一直如此:如果(primaryColIdx == null){primaryColIdx = column.index();secondaryColIdx =(primaryColIdx == 1)?2:1；}如果(column.index()=== primaryColIdx){//重置所有过滤器，因为主要过滤器正在更改:table.api().search('').columns().search('');}var filterVal = $ .fn.dataTable.util.escapeRegex($(dropdown).val());//console.log(将值id为" + filterVal的col idx"+ column.index()+"的下拉菜单)；柱子.search(filterVal?'^'+ filterVal +'$':''，true，false).画();}函数rebuildSecondaryDropdown(table，primaryColIdx){var secondaryCol;table.api().columns(secondaryColIdx).every(function(){secondaryCol = this;})；//仅获取其他"列的未过滤(未隐藏)值:var raw = table.api().columns({search:'applied'}).data()[secondaryColIdx];//以下内容使用扩展语法"(...)进行排序和重复数据删除://https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Spread_syntaxvar uniques = [... new Set(raw)].sort();varfilteredSelect = $('< select>< option value ="></option></select>').appendTo($(secondaryCol.footer()).empty()).on('change'，function(){var dropdown = this;doFilter(table，dropdown，secondaryCol);//rebuildSecondaryDropdown(table，column.index());})；uniques.forEach(函数(项目，索引){filterSelect.append('< option value ='+ item +'">'+ item +'</option>')})；}</script> Using the following code of multi-filtering select inputs in Datatables is it possible to show only available values in the other select inputs upon a selection in one filter? To be more precise, in this example if I select 'Tokyo' as an Office, I would like to populate only the values 'Accountant', 'Integration Specialist', 'Support Engineer' and 'Regional Marketing' in the dropdown menu of Position.
$(document).ready(function() {
$('#example').DataTable( {
initComplete: function () {
this.api().columns([1,2]).every( function () {
var column = this;
var select = $('<select><option value=""></option></select>')
.appendTo( $(column.footer()).empty() )
.on( 'change', function () {
var val = $.fn.dataTable.util.escapeRegex(
$(this).val()
);
column
.search( val ? '^'+val+'$' : '', true, false )
.draw();
} );
column.data().unique().sort().each( function ( d, j ) {
select.append( '<option value="'+d+'">'+d+'</option>' )
} );
} );
}
} );
} );
////// here I get the unique values of each filtered `select` option
$('select').on('change', function () {
var dtable = $('#datatable').DataTable();
var filteredArray = [];
var filteredArray2 = [];
dtable.column(1, { search: 'applied' }).data()
.unique()
.sort()
.each(function (value, index) {
filteredArray.push(value);
});
dtable.column(2, { search: 'applied' })
.data()
.unique()
.sort()
.each(function (value, index) {
filteredArray2.push(value);
});
console.log(filteredArray);
console.log(filteredArray2);
});
In my case I have filters in two columns only as it is shown in the above snippet, so upon selection in one of the two filters I would ideally like to show only available values in the other filter.
Although I have managed to get the unique values of each filter upon a selection I am struggling to hide all the input values that do not exist in the filteredArrays
Here is one approach for doing this.
The end result is as follows:
Building a drop-down which only contains the unfiltered (visible) values of a column is relatively straightforward. At the heart of doing this we use the following:
columns( { search: 'applied' } ).data()[index]
Most of the complexity relates to managing the inter-related states of the two drop-downs. After loading the page, whichever drop-down gets used first is designated as the "primary" drop-down and the other is the "secondary". Whenever the user selects a new value from the primary drop-down, we have to clear the secondary drop-down; and then after the primary drop-down filter has been applied, we have to re-build the secondary drop-down's list of values.
The end result is this:
<script type="text/javascript">
/* Each drop-down selection affects the values in the other drop-downs */
var primaryColIdx;
var secondaryColIdx;
$(document).ready(function() {
$('#example').DataTable( {
initComplete: function () {
populateDropdowns(this);
}
} );
} );
function populateDropdowns(table) {
table.api().columns([1,2]).every( function () {
var column = this;
//console.log("processing col idx " + column.index());
var select = $('<select><option value=""></option></select>')
.appendTo( $(column.footer()).empty() )
.on( 'change', function () {
var dropdown = this;
doFilter(table, dropdown, column);
rebuildSecondaryDropdown(table, column.index());
} );
column.data().unique().sort().each( function ( val, idx ) {
select.append( '<option value="' + val + '">' + val + '</option>' )
} );
} );
}
function doFilter(table, dropdown, column) {
// first time a drop-down is used, it becomes the primary. This
// remains the case until the page is refreshed:
if (primaryColIdx == null) {
primaryColIdx = column.index();
secondaryColIdx = (primaryColIdx == 1) ? 2 : 1;
}
if (column.index() === primaryColIdx) {
// reset all the filters because the primary is changing:
table.api().search( '' ).columns().search( '' );
}
var filterVal = $.fn.dataTable.util.escapeRegex($(dropdown).val());
//console.log("firing dropdown for col idx " + column.index() + " with value " + filterVal);
column
.search( filterVal ? '^' + filterVal + '$' : '', true, false )
.draw();
}
function rebuildSecondaryDropdown(table, primaryColIdx) {
var secondaryCol;
table.api().columns(secondaryColIdx).every( function () {
secondaryCol = this;
} );
// get only the unfiltered (unhidden) values for the "other" column:
var raw = table.api().columns( { search: 'applied' } ).data()[secondaryColIdx];
// the following uses "spread syntax" (...) for sorting and de-duping:
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax
var uniques = [...new Set(raw)].sort();
var filteredSelect = $('<select><option value=""></option></select>')
.appendTo( $(secondaryCol.footer()).empty() )
.on( 'change', function () {
var dropdown = this;
doFilter(table, dropdown, secondaryCol);
//rebuildSecondaryDropdown(table, column.index());
} );
uniques.forEach(function (item, index) {
filteredSelect.append( '<option value="' + item + '">' + item + '</option>' )
} );
}
</script>
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