给一个动态创建的元素一个 id

Question

I have created a posting system in js and for the element I create within the unordered list I want to assign it an id (eg <p id="Hello">...</p> ). Using the posting system (in js) the newly created html element shall be given an id.

js code:

function publish() {
    var title = document.getElementById("title").value;
    var description = document.getElementById("description").value;
    var para = document.createElement("h3");
    var node = document.createTextNode(title);
    para.appendChild(node);

    var element = document.getElementById("posts");
    element.appendChild(para);

    var para = document.createElement("small");
    var node = document.createTextNode("--".concat(description, "--"));
    para.appendChild(node);

    var image = document.getElementById("posts");
    element.appendChild(para)
    var image = document.createElement("img");
    var imageInput = document.getElementById('image-file');
    image.src = URL.createObjectURL(imageInput.files[0]);
    image.style.height = '100px';
    image.style.width = '100px';

    para.appendChild(image);
}

html code:

    <button id="publish-button" onclick="publish();">Publish</button>
        <p>Title</p>
        <input class="Title" id="title"></input>

        <p>Description</p>
        <input class="Description" id="description"></input>

        <p>Images</p>
        <input id="image-file" type="file" />
<ul id="posts">
    </ul>

Answer 1

This adds id='1' to the small tag and will increment by 1 each time you add an image. Just declare a global for id and then set para.id = id

 var id=0; function publish() { var title = document.getElementById("title").value; var description = document.getElementById("description").value; var para = document.createElement("h3"); var node = document.createTextNode(title); para.appendChild(node); var element = document.getElementById("posts"); element.appendChild(para); var para = document.createElement("small"); id++; para.id=id; var node = document.createTextNode("--".concat(description, "--")); para.appendChild(node); var image = document.getElementById("posts"); element.appendChild(para) var image = document.createElement("img"); var imageInput = document.getElementById('image-file'); image.src = URL.createObjectURL(imageInput.files[0]); image.style.height = '100px'; image.style.width = '100px'; para.appendChild(image); }

 <button id="publish-button" onclick="publish();">Publish</button> <p>Title</p> <input class="Title" id="title"></input> <p>Description</p> <input class="Description" id="description"></input> <p>Images</p> <input id="image-file" type="file" /> <ul id="posts"> </ul>