[英]How Can I keep the dropdown last selected on refresh page
我有這個HTML
<select id="drpRequestCategories" class="form-control" Width="100%">
<option value="-1">All</option>
</select>
這是我填寫的選擇功能
function filldropdownlistcategory(res) {
var test = $.parseJSON(res.d);
$("#drpRequestCategories").empty();
$(test).each(function () {
var option = $('<option />');
option.attr('value', this.ServiceID).text(this.ServiceName);
$('#drpRequestCategories').append(option);
});
}
當我單擊頁面1上的“搜索”按鈕時,它會清除此下拉列表,但我需要保留最后選擇的值。 2-我在每個treeview節點更改時都調用此函數,所以當我刪除此函數時
$("#drpRequestCategories").empty();
它不會刪除舊的下拉值,而是將新值附加到舊的。
首先,使用localstorage設置保存最后一個選定項的鍵,然后每個節點更改都首先清空選擇框,然后使用localstorage項再次填充該框
//Add the onchange listener for the select box
$("#drpRequestCategories").on('change',function(evt){
var optionSelected=evt.target.value;
localStorage.setItem("recent",optionSelected);
}
//Now your function
function filldropdownlistcategory(res){
//empty the box
$("#drpRequestCategories").empty();
$(test).each(function () {
var option = $('<option />');
option.attr('value', this.ServiceID).text(this.ServiceName);
$('#drpRequestCategories').append(option);
});
//Once U have appended the options attach the previous list to the select box
var prevOptions=JSON.parse(localStorage.getItem("options"));
for(var key in options){
var option=$('<option />')
option.attr("value",options[key]).text(options[key])
$("#drpRequestCategories").append(option)
}
//Now Select the Last selected option
var lastSelected=localStorage.getItem("recent");
$("#drpRequestCategories").val(lastSelected);
//Once all the options are populated call the storeOptions Function
storeOptions();
}
//Function to store the options
function storeOptions(){
var options=$("#drpRequestCategories").children();
var obj={};
for(var i=0;i<options.length;i++){
var optionText=options[0].value || options[0].innerHTML //Depends on what you want
//update the obj
obj["option"+i]=optionText;
}
//Now Store them in localStorage
localStorage.setItem("options",JSON.stringify(obj))//stringify will convert the object into a string
}
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