Detailed case explanation_Using javascript to write user list combination condition filtering-JS Tutorial-php.cn

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Detailed case explanation_Using javascript to write user list combination condition filtering

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Aug 01, 2018 am 10:40 AM

This article introduces how to use native js to write user list combination condition filtering? The function of combined condition filtering can be carried out through buttons and input text. The following code will be introduced in detail. First, the previous rendering:

Detailed case explanation_Using javascript to write user list combination condition filtering Here, an array is used to simulate the background data (the background data can be requested with ajax):

var person = [
    { name: &#39;王小妹&#39;, src: &#39;01pic.jpg&#39;, sex: &#39;male&#39;, des: &#39;漂亮的妹子&#39;},
    { name: &#39;金小妹&#39;, src: &#39;02pic.jpg&#39;, sex: &#39;male&#39;, des: &#39;漂亮的程序媛&#39;},
    { name: &#39;陈小华&#39;, src: &#39;07pic.jpg&#39;, sex: &#39;female&#39;, des: &#39;相互学习&#39;},
    { name: &#39;马爱国&#39;, src: &#39;08pic.jpg&#39;, sex: &#39;female&#39;, des: &#39;喜欢猫&#39;},
    { name: &#39;邓小茜&#39;, src: &#39;04pic.jpg&#39;, sex: &#39;male&#39;, des: &#39;喜欢运动&#39;},
    { name: &#39;马学习&#39;, src: &#39;06pic.jpg&#39;, sex: &#39;female&#39;, des: &#39;喜欢看书&#39;}
]

Main html structure:

<body>
    <p class="wrapper">
        <p class="search">
            <input type="text" placeholder="请输入用户名" id="input">
            <ul id="searchUl">
                <li class="active" sex = "all">All</li>
                <li sex = "male">Male</li>
                <li sex = "female">Female</li>
            </ul>
        </p>
        <p class="userList">
            <ul id="list">
                <!-- 方便确定插入数据的结构和样式 -->
                <!-- <li><img src="/static/imghwm/default1.png"  data-src="./images/01pic.jpg"  class="lazy"   alt="">
                    <span class="name">小航</span>
                    <span class="des">描述</span>
                </li> -->
            </ul>
        </p>
    </p>

    <script src="./searchingData.js"></script>
</body>

Ideas and js core code:

1) Rendering dom structure: use the forEach() method to traverse the array and find the data that meets the conditions , generate several li structure code blocks when there are several pieces of data, and then insert the generated li structure into ul;

var listUl = document.getElementById(&#39;list&#39;);
var oInp = document.getElementById(&#39;input&#39;);
var sUl = document.getElementById(&#39;searchUl&#39;);


//渲染dom结构，遍历数组使用forEach()方法
function render(list){
    var str = &#39;&#39;;
    list.forEach(function(ele, index){
        str += &#39;<li><img src="/static/imghwm/default1.png"  data-src="./images/&#39;+ ele.src +&#39;"  class="lazy"   alt="">\
        <span class="name">&#39;+ ele.name +&#39;</span>\
        <span class="des">&#39;+ ele.des +&#39;</span></li>&#39;;
    });
    listUl.innerHTML = str;
}

2) Single input box text filtering: get the value entered in the input input box, and bind An oninput event, using the array filtering method filter() for text filtering;

//获取input输入的value值，需绑定一个oninput事件，获取过滤结果后渲染
oInp.oninput = function(){
    var text = this.value; 
    //state.text = this.value; //组合条件筛选
    render(filterText(text, person)); //单一筛选、渲染
    //render(addFn(filterFn,person)); //组合条件筛选、渲染
}

//输入文本过滤
function filterText(val, arr){
    var fArr = arr.filter(function(ele, index){
        if(ele.name.indexOf(val) !== -1){
            return true;
        }
    })
    return fArr;
}

3) Single click button filtering: The click event is bound to ul and triggered by li

//绑定点击事件
sUl.addEventListener(&#39;click&#39;, function(e){
    if(e.target.tagName == &#39;LI&#39;){
        var sex = e.target.getAttribute(&#39;sex&#39;);
        //state.sex = e.target.getAttribute(&#39;sex&#39;); //组合条件筛选
        document.getElementsByClassName(&#39;active&#39;)[0].className = &#39;&#39;; //修改点击按钮的样式
        e.target.className = &#39;active&#39;; //修改点击按钮的样式
        render(filterSex(sex, person));
        //render(addFn(filterFn,person));//组合条件筛选、渲染
    }
})

//点击按钮筛选
function filterSex(sex, arr){
    if(sex == &#39;all&#39;){
        return arr;
    }else{
        var sArr = arr.filter(function(ele, index){
            if(sex == ele.sex){
                return true;
            }
        })
        return sArr;
    }
}

4 ) Combined condition filtering: Connect the combined object (input box and button) and the filtering function through the props of the two objects

//组合筛选，在一个筛选结果的基础上筛选（修改传入数组arr），参数lastArr上一次筛选返回的数组

//筛选条件：实现筛选条件的函数
var filterFn = {
    text: filterText,
    sex: filterSex
}

//筛选条件：之前的筛选的值text、sex 要改为 state.text state.sex
var state = {
    text: &#39;&#39;,
    sex: &#39;all&#39;
}

//组合
function addFn(obj, arr){
    var lastArr = arr;
    for(var prop in obj){
        lastArr = obj[prop](state[prop], lastArr);
        console.log(lastArr);
    }
    return lastArr;
}

JavaScript front-end data multi-condition filtering Function implementation code

Example of JavaScript implementing multi-condition filtering function of front-end data

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