How to implement the negation method in jquery

The jquery method to achieve inversion: 1. Import the jQuery library; 2. Set the click event; 3. Loop to set the selected status of other multi-select boxes; 4. Implement the inversion of the identification variable through the "!chkall;" method That’s it.

The operating environment of this article: windows7 system, jquery-2.1.4 version, Dell G3 computer.

How to implement the inversion method in jquery?

Several methods of using JQuery to achieve all selection and inverse selection

As shown in the figure: the effect to be achieved is to click the Select All box to select all, and then click to unselect all

Method 1: 1. Import the jQuery library, which can be downloaded online and is free and open source. 2. Set the class to fruit and set their properties through prop.

Method 1: jQuery code:

//定义标识，true表示选中
        var chkall = true;
        $(function () {
            //全选按钮设置点击事件
            $("#btnAll").click(function () {
                //1、循环设置其它多选框选中状态，跟标识用的变量一样
                $(".fruit").prop("checked", chkall);
                //2、标识的变量取反
                chkall = !chkall;
            })
        })

Method 2 idea: Get all the radio button boxes through the form filter, and then set the checked attribute in a loop.

Method 2: jQuery code:

$(function () {
                //得到全选框的值
                var $checked = this.checked;
                //通过表单过滤器得到所有单选框
                $("input[class=fruit]").each(function () {
                    //单选框的值与全选框的值保持一致
                    this.checked = $checked;
                })
            })
        })

Final additional explanation: In JQuery, we generally use Attr to obtain attributes, and we use prop to set the value of attributes.

Recommended learning: " jquery video tutorial》

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