Select2在HTML中设置选定值

Select2 set selected value in HTML

本文关键字：设置 HTML Select2      更新时间：2023-09-26

是否有一种方法，我可以设置选定的id/文本在select2在HTML就像被显示和选择?

我使用jquery select2版本4.0.0

这是代码:

$("#users").select2({
    placeholder: "select user...",
    escapeMarkup: function (markup) { return markup; },
    ajax: {
        url: "users.json",
        dataType: 'json',
        delay: 250,
        data: function (params) {
            return {
                q: params.term, // search term
                page: params.page
            };
        },
        processResults: function (response, page) {
            return {
                results: response.data
            };
        },
        cache: true
    },
    templateResult: function(item){
        if (item.loading) {
            return item.text;
        }
        return item.username + " <small><i>(" + item.role  + ")</i></small> "; // display data in html
    },
    templateSelection: function(item){
        if (item.username){
            return item.username + " <small><i>(" + item.role  + ")</i></small> ";  // select row in html
        }
        return item.text; // for placeholder
    }
});

设置所选值:

// bring data for to set selected value, data contains fields data
var selected_user_id = data.id,
// this is the content that I need to use as it is HTML content
selected_user_text_html = data.username + " <small><i>(" + data.role  + ")</i></small> ",
// this is the one that I am using and is not html because there is no way to put html inside a option select item
selected_user_text_regular = data.username + " (" + data.role  + ") ";
// set selected value
$("#users").append("<option value='"+selected_user_id+"' selected='selected'>"+selected_user_text_regular+"</option>");
// trigger update
$("#users").trigger("change");

是否有一种方法可以将所选文本设置为HTML而不是纯文本?

是的，你可以。Select2有两个有用的选项"templateSelection"answers"templateResult"都是函数，你可以创建任何你想要的html包装器。只需像这样将选项传递给select2()方法.

var data = [{id: 100, text: "AAAAAA"}, {id: 200, text: "BBBB"}]
var formatState = function(result) {return $("<b>"+result.text+"</b>")}
var formatSelection = function(selection){return $("<b>"+selection.text+"</b>") }
$(".js-example-basic-single").select2({ data:data,templateResult: formatState, templateSelection: formatSelection
    }).val(100).change();

你应该看到id:100的选项被选中了。

如果我没理解错的话，

根据api https://select2.github.io/examples.html，你可以把它放到HTML标记中，然后调用javascript

var data = [
     { id: 0, text: 'enhancement' },
     { id: 1, text: 'bug' },
     { id: 2, text: 'duplicate' },
     { id: 3, text: 'invalid' },
     { id: 4, text: 'wontfix' }
 ]
$(".example").select2({
  data: data
})
<select class="example">
    <option value="3" selected="selected">invalid</option>
</select>

假设ajax在声明

时被调用

当ajax返回时，您将无法附加该选项。

ajax: {
 ...
    processResults: function (response, page) {
           //something like
           $.each( response.data, function( i, obj ) {
                if(obj.selected)
                {
                    var elem = $('#users')
                    elem.append($('<option>', { 
                        value: obj.value,
                        text : obj.text,
                        selected : "selected"
                    }));
                }
           })

        return {
            results: response.data
        };
    },
    cache: true
},

也更新

考虑下面的代码来代替你的其他代码或给你的想法

<style>
   .optionrole{
        font-size: small;
        font-style: italic
   }
</style>
var sUserId = data.id,
var sUserText = data.username 
                        + "<span class="optionrole"> (" 
                        + data.role  
                        + ")</span> ";
// set selected value
var elem = $('#users')
elem.append($('<option>', { 
    value: sUserId,
    text : sUserText,
    selected : "selected"
}));
// trigger update
elem.trigger("change");
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