我试图用 Javascript 自己制作一个照片库,这是我的代码:
var images = [
"BAN46",
"BASTIONE"
];
var legendes = [
"exemple \"avec des\" guillemets",
"legende2"
];
var path = '/galerie/';
var nbr = images.length;
var galerie = document.getElementById('sous_galerie');
var bloc_image = document.getElementById('bloc_image');
var nouvelle_image;
for(var i = 0; i < nbr; i++) {
nouvelle_image = document.createElement('img');
nouvelle_image.src = path + 'vignettes/' + images[i] + '-vignette.jpg';
nouvelle_image.alt = images[i];
nouvelle_image.setAttribute('onclick', 'zoom(' + i + ')');
galerie.appendChild(nouvelle_image);
}
function zoom(i) {
var image = document.createElement('img');
image.src = path + images[i] + '.jpg';
image.alt = images[i];
image.id = images[i];
image.setAttribute('onclick', 'dispose(' + i + ')');
var paragraphe = document.createElement('p');
paragraphe.innerHTML = legendes[i];
paragraphe.id = legendes[i];
var ratio = image.height / image.width;
if(image.height >= 750) {
image.height = '750';
image.width = image.height / ratio;
}
image.style.marginTop = 0 - image.height / 2 + 'px';
image.style.marginLeft = 0 - image.width / 2 + 'px';
paragraphe.style.width = image.width + 'px';
paragraphe.style.marginTop = (image.height + 20) / 2 + 'px';
paragraphe.style.marginLeft = 0 - image.width / 2 + 'px';
bloc_image.style.width = '100%';
bloc_image.style.height = '100%';
bloc_image.appendChild(image);
bloc_image.appendChild(paragraphe);
}
function dispose(i) {
bloc_image.removeChild(document.getElementById(images[i]));
bloc_image.removeChild(document.getElementById(legendes[i]));
bloc_image.style.width = '0';
bloc_image.style.height = '0';
}
(对不起,代码是法语。如果您需要对代码进行评论或精确,请随时问我=))
我的问题是,当我单击小插图时,它显示正确的图像,但认为它的宽度和高度为 0px,因此图像正确显示但向东南移动,因为
image.style.marginTop = 0 - image.height / 2 + 'px';
image.style.marginLeft = 0 - image.width / 2 + 'px';
此外,标题也移动到图片上。但是,当我更新页面并重试时,这次图片正确显示并位于中间,因为它的宽度和高度值是正确的。
似乎浏览器在加载其属性之前显示图像和标题,我不知道如何纠正这个“错误”。