Javascript：如何在不使用fetchapi一次又一次地调用API的情况下过滤UI上的数据？

当用户在输入框中键入并点击搜索按钮时，我希望根据用户界面上的数据进行过滤，即用户名是否以输入的文本开头。我不想一次又一次地调用API

function searchData(){
    let url = 'https://jsonplaceholder.typicode.com/users';

    let data = document.getElementById("usersearch").value;

    //passing the username, user enters as a url to the showData function
    url = url+"?username="+`${data}`;
    showData(url);
}

function showData(url){

    fetch(url)
    .then(response => response.json())
    .then(data =>   {
        let out = '<h2 class = "mt-3 mb-3">Search Result</h2>';

        data.forEach(user =>{
            out += `
                <ul class = "mylist card">
                    <li id = "myli" class = "card-body text-primary pl-3"> ${user.name} </li>
                    <li class = "card-body text-secondary"> ${user.email} </li>
                    <li id = "myli2" class = "card-body text-info"><a href = "https://${user.website}"> ${user.website} </a></li>
                </ul>
            `;      


        })

       //Edit
       document.getElementById("output").innerHTML = out;

    })
    .catch(err => console.log('Error : ',err.message))
}

//Edit
<button class = "btn btn-secondary" id = "btn1" onclick = "searchData()">Search</button>

使用JavaScriptFetchAPI概念，我尝试按用户名搜索，但每次搜索时它都会调用API

function searchData(){
    let url = 'https://jsonplaceholder.typicode.com/users';

    let data = document.getElementById("usersearch").value;

    //passing the username, user enters as a url to the showData function
    url = url+"?username="+`${data}`;
    showData(url);
}

function showData(url){

    fetch(url)
    .then(response => response.json())
    .then(data =>   {
        let out = '<h2 class = "mt-3 mb-3">Search Result</h2>';

        data.forEach(user =>{
            out += `
                <ul class = "mylist card">
                    <li id = "myli" class = "card-body text-primary pl-3"> ${user.name} </li>
                    <li class = "card-body text-secondary"> ${user.email} </li>
                    <li id = "myli2" class = "card-body text-info"><a href = "https://${user.website}"> ${user.website} </a></li>
                </ul>
            `;      


        })

       //Edit
       document.getElementById("output").innerHTML = out;

    })
    .catch(err => console.log('Error : ',err.message))
}

//Edit
<button class = "btn btn-secondary" id = "btn1" onclick = "searchData()">Search</button>

这就是我所做的

function searchData(){
    let url = 'https://jsonplaceholder.typicode.com/users';

    let data = document.getElementById("usersearch").value;

    //passing the username, user enters as a url to the showData function
    url = url+"?username="+`${data}`;
    showData(url);
}

function showData(url){

    fetch(url)
    .then(response => response.json())
    .then(data =>   {
        let out = '<h2 class = "mt-3 mb-3">Search Result</h2>';

        data.forEach(user =>{
            out += `
                <ul class = "mylist card">
                    <li id = "myli" class = "card-body text-primary pl-3"> ${user.name} </li>
                    <li class = "card-body text-secondary"> ${user.email} </li>
                    <li id = "myli2" class = "card-body text-info"><a href = "https://${user.website}"> ${user.website} </a></li>
                </ul>
            `;      


        })

       //Edit
       document.getElementById("output").innerHTML = out;

    })
    .catch(err => console.log('Error : ',err.message))
}

//Edit
<button class = "btn btn-secondary" id = "btn1" onclick = "searchData()">Search</button>

函数searchData（）{
让url为空https://jsonplaceholder.typicode.com/users';
让data=document.getElementById（“usersearch”）.value；
//通过用户名，用户以url的形式输入showData函数
url=url+“？用户名=“++${data}”；
showData（url）；
}
函数showData（url）{
获取（url）
.then（response=>response.json（））
。然后（数据=>{
释放='搜索结果'；
data.forEach（用户=>{
输出+=`

${user.name}
${user.email}


`;      
})
//编辑
document.getElementById（“输出”）.innerHTML=out；
})
.catch（err=>console.log（'Error:'，err.message））
}
//编辑
搜寻

我不想一次又一次地调用API或每次单击搜索按钮

function searchData(){
    let url = 'https://jsonplaceholder.typicode.com/users';

    let data = document.getElementById("usersearch").value;

    //passing the username, user enters as a url to the showData function
    url = url+"?username="+`${data}`;
    showData(url);
}

function showData(url){

    fetch(url)
    .then(response => response.json())
    .then(data =>   {
        let out = '<h2 class = "mt-3 mb-3">Search Result</h2>';

        data.forEach(user =>{
            out += `
                <ul class = "mylist card">
                    <li id = "myli" class = "card-body text-primary pl-3"> ${user.name} </li>
                    <li class = "card-body text-secondary"> ${user.email} </li>
                    <li id = "myli2" class = "card-body text-info"><a href = "https://${user.website}"> ${user.website} </a></li>
                </ul>
            `;      


        })

       //Edit
       document.getElementById("output").innerHTML = out;

    })
    .catch(err => console.log('Error : ',err.message))
}

//Edit
<button class = "btn btn-secondary" id = "btn1" onclick = "searchData()">Search</button>

编辑：

function searchData(){
    let url = 'https://jsonplaceholder.typicode.com/users';

    let data = document.getElementById("usersearch").value;

    //passing the username, user enters as a url to the showData function
    url = url+"?username="+`${data}`;
    showData(url);
}

function showData(url){

    fetch(url)
    .then(response => response.json())
    .then(data =>   {
        let out = '<h2 class = "mt-3 mb-3">Search Result</h2>';

        data.forEach(user =>{
            out += `
                <ul class = "mylist card">
                    <li id = "myli" class = "card-body text-primary pl-3"> ${user.name} </li>
                    <li class = "card-body text-secondary"> ${user.email} </li>
                    <li id = "myli2" class = "card-body text-info"><a href = "https://${user.website}"> ${user.website} </a></li>
                </ul>
            `;      


        })

       //Edit
       document.getElementById("output").innerHTML = out;

    })
    .catch(err => console.log('Error : ',err.message))
}

//Edit
<button class = "btn btn-secondary" id = "btn1" onclick = "searchData()">Search</button>

---

我使用onclick函数调用searchData（）方法。您可以声明两个变量，一个用于存储整个用户列表，另一个用于根据输入和显示进行过滤

function searchData(){
    let url = 'https://jsonplaceholder.typicode.com/users';

    let data = document.getElementById("usersearch").value;

    //passing the username, user enters as a url to the showData function
    url = url+"?username="+`${data}`;
    showData(url);
}

function showData(url){

    fetch(url)
    .then(response => response.json())
    .then(data =>   {
        let out = '<h2 class = "mt-3 mb-3">Search Result</h2>';

        data.forEach(user =>{
            out += `
                <ul class = "mylist card">
                    <li id = "myli" class = "card-body text-primary pl-3"> ${user.name} </li>
                    <li class = "card-body text-secondary"> ${user.email} </li>
                    <li id = "myli2" class = "card-body text-info"><a href = "https://${user.website}"> ${user.website} </a></li>
                </ul>
            `;      


        })

       //Edit
       document.getElementById("output").innerHTML = out;

    })
    .catch(err => console.log('Error : ',err.message))
}

//Edit
<button class = "btn btn-secondary" id = "btn1" onclick = "searchData()">Search</button>

另外，当您分离fetch和UI时，您和其他开发人员会更加清楚。所以您必须重构showData（）以分离这些进程

function searchData(){
    let url = 'https://jsonplaceholder.typicode.com/users';

    let data = document.getElementById("usersearch").value;

    //passing the username, user enters as a url to the showData function
    url = url+"?username="+`${data}`;
    showData(url);
}

function showData(url){

    fetch(url)
    .then(response => response.json())
    .then(data =>   {
        let out = '<h2 class = "mt-3 mb-3">Search Result</h2>';

        data.forEach(user =>{
            out += `
                <ul class = "mylist card">
                    <li id = "myli" class = "card-body text-primary pl-3"> ${user.name} </li>
                    <li class = "card-body text-secondary"> ${user.email} </li>
                    <li id = "myli2" class = "card-body text-info"><a href = "https://${user.website}"> ${user.website} </a></li>
                </ul>
            `;      


        })

       //Edit
       document.getElementById("output").innerHTML = out;

    })
    .catch(err => console.log('Error : ',err.message))
}

//Edit
<button class = "btn btn-secondary" id = "btn1" onclick = "searchData()">Search</button>

这里是过程=

function searchData(){
    let url = 'https://jsonplaceholder.typicode.com/users';

    let data = document.getElementById("usersearch").value;

    //passing the username, user enters as a url to the showData function
    url = url+"?username="+`${data}`;
    showData(url);
}

function showData(url){

    fetch(url)
    .then(response => response.json())
    .then(data =>   {
        let out = '<h2 class = "mt-3 mb-3">Search Result</h2>';

        data.forEach(user =>{
            out += `
                <ul class = "mylist card">
                    <li id = "myli" class = "card-body text-primary pl-3"> ${user.name} </li>
                    <li class = "card-body text-secondary"> ${user.email} </li>
                    <li id = "myli2" class = "card-body text-info"><a href = "https://${user.website}"> ${user.website} </a></li>
                </ul>
            `;      


        })

       //Edit
       document.getElementById("output").innerHTML = out;

    })
    .catch(err => console.log('Error : ',err.message))
}

//Edit
<button class = "btn btn-secondary" id = "btn1" onclick = "searchData()">Search</button>

获取所有用户并将其存储到一个永远不会更改的变量中

function searchData(){
    let url = 'https://jsonplaceholder.typicode.com/users';

    let data = document.getElementById("usersearch").value;

    //passing the username, user enters as a url to the showData function
    url = url+"?username="+`${data}`;
    showData(url);
}

function showData(url){

    fetch(url)
    .then(response => response.json())
    .then(data =>   {
        let out = '<h2 class = "mt-3 mb-3">Search Result</h2>';

        data.forEach(user =>{
            out += `
                <ul class = "mylist card">
                    <li id = "myli" class = "card-body text-primary pl-3"> ${user.name} </li>
                    <li class = "card-body text-secondary"> ${user.email} </li>
                    <li id = "myli2" class = "card-body text-info"><a href = "https://${user.website}"> ${user.website} </a></li>
                </ul>
            `;      


        })

       //Edit
       document.getElementById("output").innerHTML = out;

    })
    .catch(err => console.log('Error : ',err.message))
}

//Edit
<button class = "btn btn-secondary" id = "btn1" onclick = "searchData()">Search</button>

要显示它们，请使用第二个变量，该变量将根据输入过滤结果

function searchData(){
    let url = 'https://jsonplaceholder.typicode.com/users';

    let data = document.getElementById("usersearch").value;

    //passing the username, user enters as a url to the showData function
    url = url+"?username="+`${data}`;
    showData(url);
}

function showData(url){

    fetch(url)
    .then(response => response.json())
    .then(data =>   {
        let out = '<h2 class = "mt-3 mb-3">Search Result</h2>';

        data.forEach(user =>{
            out += `
                <ul class = "mylist card">
                    <li id = "myli" class = "card-body text-primary pl-3"> ${user.name} </li>
                    <li class = "card-body text-secondary"> ${user.email} </li>
                    <li id = "myli2" class = "card-body text-info"><a href = "https://${user.website}"> ${user.website} </a></li>
                </ul>
            `;      


        })

       //Edit
       document.getElementById("output").innerHTML = out;

    })
    .catch(err => console.log('Error : ',err.message))
}

//Edit
<button class = "btn btn-secondary" id = "btn1" onclick = "searchData()">Search</button>

每次搜索时，只需执行searchData（）函数

function searchData(){
    let url = 'https://jsonplaceholder.typicode.com/users';

    let data = document.getElementById("usersearch").value;

    //passing the username, user enters as a url to the showData function
    url = url+"?username="+`${data}`;
    showData(url);
}

function showData(url){

    fetch(url)
    .then(response => response.json())
    .then(data =>   {
        let out = '<h2 class = "mt-3 mb-3">Search Result</h2>';

        data.forEach(user =>{
            out += `
                <ul class = "mylist card">
                    <li id = "myli" class = "card-body text-primary pl-3"> ${user.name} </li>
                    <li class = "card-body text-secondary"> ${user.email} </li>
                    <li id = "myli2" class = "card-body text-info"><a href = "https://${user.website}"> ${user.website} </a></li>
                </ul>
            `;      


        })

       //Edit
       document.getElementById("output").innerHTML = out;

    })
    .catch(err => console.log('Error : ',err.message))
}

//Edit
<button class = "btn btn-secondary" id = "btn1" onclick = "searchData()">Search</button>

下面是一个基于我所解释的功能片段

function searchData(){
    let url = 'https://jsonplaceholder.typicode.com/users';

    let data = document.getElementById("usersearch").value;

    //passing the username, user enters as a url to the showData function
    url = url+"?username="+`${data}`;
    showData(url);
}

function showData(url){

    fetch(url)
    .then(response => response.json())
    .then(data =>   {
        let out = '<h2 class = "mt-3 mb-3">Search Result</h2>';

        data.forEach(user =>{
            out += `
                <ul class = "mylist card">
                    <li id = "myli" class = "card-body text-primary pl-3"> ${user.name} </li>
                    <li class = "card-body text-secondary"> ${user.email} </li>
                    <li id = "myli2" class = "card-body text-info"><a href = "https://${user.website}"> ${user.website} </a></li>
                </ul>
            `;      


        })

       //Edit
       document.getElementById("output").innerHTML = out;

    })
    .catch(err => console.log('Error : ',err.message))
}

//Edit
<button class = "btn btn-secondary" id = "btn1" onclick = "searchData()">Search</button>

让用户=[]；//用户列表
让usersFiltered=[]//您显示的用户
//您想获取所有不带过滤器的用户，并将其存储在您的用户变量中
函数fetchUsers（）{
让url为空https://jsonplaceholder.typicode.com/users';
获取（url）
.then（response=>response.json（））
。然后（数据=>{
用户=数据；
usersFiltered=用户；
showData（）；
}).catch（err=>console.log（'Error:'，err.message））；
}
//那么这个函数只显示过滤过的用户
函数showData（）{
释放='搜索结果'；
usersFiltered.forEach（用户=>{
输出+=`

${user.name}
${user.email}


`;
});
document.getElementById（'users'）.innerHTML=out；
}
//搜索数据将过滤您的输入
函数searchData（）{
让data=document.getElementById（“usersearch”）.value；
usersFiltered=users.filter（用户=>{
//这里我按名称筛选，但您可以实现所需的筛选
返回user.name.includes（数据）；
});
showData（）；
}
fetchUsers（）；//在开始时获取用户

搜寻

客户端过滤从来都不是一个好主意。一般来说，您应该更喜欢服务器端过滤点击API可以保证正确的结果，而客户端过滤可能不。我写了一个与此类似的答案

function searchData(){
    let url = 'https://jsonplaceholder.typicode.com/users';

    let data = document.getElementById("usersearch").value;

    //passing the username, user enters as a url to the showData function
    url = url+"?username="+`${data}`;
    showData(url);
}

function showData(url){

    fetch(url)
    .then(response => response.json())
    .then(data =>   {
        let out = '<h2 class = "mt-3 mb-3">Search Result</h2>';

        data.forEach(user =>{
            out += `
                <ul class = "mylist card">
                    <li id = "myli" class = "card-body text-primary pl-3"> ${user.name} </li>
                    <li class = "card-body text-secondary"> ${user.email} </li>
                    <li id = "myli2" class = "card-body text-info"><a href = "https://${user.website}"> ${user.website} </a></li>
                </ul>
            `;      


        })

       //Edit
       document.getElementById("output").innerHTML = out;

    })
    .catch(err => console.log('Error : ',err.message))
}

//Edit
<button class = "btn btn-secondary" id = "btn1" onclick = "searchData()">Search</button>

---

阅读此处：

您如何调用

searchData

？我正在使用onclick函数searchData（）调用searchData（），填写后如何显示“out”内容？@MaximeGirou document.getElementById（“output”）.innerHTML=out；好的，您可以查看我制作的代码片段；）

function searchData(){
    let url = 'https://jsonplaceholder.typicode.com/users';

    let data = document.getElementById("usersearch").value;

    //passing the username, user enters as a url to the showData function
    url = url+"?username="+`${data}`;
    showData(url);
}

function showData(url){

    fetch(url)
    .then(response => response.json())
    .then(data =>   {
        let out = '<h2 class = "mt-3 mb-3">Search Result</h2>';

        data.forEach(user =>{
            out += `
                <ul class = "mylist card">
                    <li id = "myli" class = "card-body text-primary pl-3"> ${user.name} </li>
                    <li class = "card-body text-secondary"> ${user.email} </li>
                    <li id = "myli2" class = "card-body text-info"><a href = "https://${user.website}"> ${user.website} </a></li>
                </ul>
            `;      


        })

       //Edit
       document.getElementById("output").innerHTML = out;

    })
    .catch(err => console.log('Error : ',err.message))
}

//Edit
<button class = "btn btn-secondary" id = "btn1" onclick = "searchData()">Search</button>