我正在制作一个Marvel API项目。我添加了一个“喜欢”按钮,以便可以计算喜欢次数,但是每次我单击任何一个“喜欢”按钮时,唯一添加数字的计数器就是第一个。谁能告诉我如何正确执行此操作?
问题是因为ID
是由for制造的,那么我该如何解决呢?
这是我的JS代码(在我项目的js文件中):
success: function(data)
{
footer.innerHTML = data.attributionHTML;
var string = "";
string += "<div class='row'>";
for (var i = 0; i < data.data.results.length; i++)
{
var element = data.data.results[i];
string += '<div class="col-md-3" align="center">';
string += "<img src='" + element.thumbnail.path + "/portrait_fantastic." + element.thumbnail.extension + "'/>";
string += '<button class="btn btn-success" onClick="testo()"><i class="fas fa-thumbs-up"></i> | <a id="likes">0</a></button>';
string += "<h3>" + element.title + "</h3>";
string += "</div>";
if ((i + 1) % 4 == 0)
{
string += "</div>";
string += "<div class='row'>";
}
}
marvelContainer.innerHTML = string;
}
这是我的onclick函数(它在我的html文件中,因为它不适用于我的js文件)
<script>
var likes=0;
function testo()
{
likes += 1;
document.getElementById("likes").innerHTML = likes;
}
</script>
答案 0 :(得分:4)
这是因为所有按钮都是使用相同的id="likes"
生成的,然后您使用document.getElementById("likes").innerHTML = likes;
来更改HTML
为了使代码正常工作,您将需要使用其他方法,可能需要在按钮上添加data- *属性,然后使用.getAttribute('data-id-something').innerHTML
而不是document.getElementById("likes").innerHTML
通过data- *属性来更改赞。
甚至在这种情况下甚至更好,您可以为按钮指定一个类名,并使用以下命令进行处理:document.getElementsByClassName("like-btn")
您可以在此示例中检查最后一个选项:
var init = function(data){
var string ="";
string += "<div class='row'>";
for(var i = 0; i<4; i++)
{
// var element = data.data.results[i];
string += '<div class="col-md-3" align="center">';
string += "<img src='/portrait_fantastic.jgeg'/>";
string += '<button class="btn btn-success" onClick="testo('+i+')"><i class="fas fa-thumbs-up"></i> | <span class="like-btn">0</span></button>';
string += "<h3>Element title</h3>";
string += "</div>";
if((i+1) % 4 ==0)
{
string += "</div>";
string += "<div class='row'>";
}
}
document.getElementById("marvelContainer").innerHTML = string;
}
init();
<script>
var likes=0;
function testo(id) {
var btn = document.getElementsByClassName("like-btn");
likes = parseFloat(btn[id].innerHTML);
likes += 1;
btn[id].innerHTML = likes;
}
</script>
<div id="marvelContainer"></div>
我希望它将对您有帮助...
答案 1 :(得分:1)
// fake out some data for the element generation
var data = { data: {
results: [
{ thumbnail: { path: '/path1', extension: 'jpg', title: 'Element1' } }
,{ thumbnail: { path: '/path2', extension: 'png', title: 'Element2' } }
,{ thumbnail: { path: '/path3', extension: 'gif', title: 'Element3' } }
]
} };
// fake out the container the elements are built to
var marvelContainer = document.querySelector('#container');
var string = "<div class='row'>";
for (var i = 0; i < data.data.results.length; i++) {
var element = data.data.results[i];
string += '<div class="col-md-3" align="center">';
string += "<img src='" + element.thumbnail.path + "/portrait_fantastic." + element.thumbnail.extension + "'/>";
// put a class on the button
// also removed the id and inline onclick
// change the id on the link to a class
// also initialized the data-likes on the link to zero
string += '<button class="btn btn-success likes-button"><i class="fas fa-thumbs-up"></i> | <span class="likes" data-likes="0">0</span></button>';
string += "<h3>" + element.title + "</h3>";
string += "</div>";
if ((i + 1) % 4 == 0) {
string += "</div>";
string += "<div class='row'>";
}
}
marvelContainer.innerHTML = string;
document.querySelectorAll('.likes-button, .likes').forEach(function(likeButton){
likeButton.addEventListener('click', incrementLikes);
});
function incrementLikes (e) {
e.stopPropagation();
// find the inner likes element of the button
var likes = e.target.querySelector('.likes') || e.target;
// increment the likes
var incrementedLikes = parseInt(likes.dataset.likes) + 1;
// update the data attribute for next click, and update the text
likes.dataset.likes = incrementedLikes.toString();
likes.innerText = incrementedLikes;
}
<div id="container">
</div>