[英]How do I add a javascript variable to HTML image src tag
I know this answer is out here, but I have been unable to find it (or at least recognize it when I saw it!). 我知道这个答案在这里,但我一直无法找到它(或者至少在我看到它时就认出来了!)。 I'm a relative noob to jquery, so bear with me please.
我是jquery的亲戚,所以请耐心等待。
I have 20 images, named 1.png through 20.png . 我有20张图片,名为1.png到20.png 。 I would like a different image to display randomly each time a user clicks a button.
我想在每次用户点击按钮时随机显示不同的图像。
My javascript code to generate the random number looks like this: 我生成随机数的javascript代码如下所示:
var randomImage = 1 + Math.floor(Math.random() * 20);
What I'm trying to do is pass the result of that to my HTML document as the name of the image, so that is reads something like this: 我想要做的是将结果传递给我的HTML文档作为图像的名称,所以这是这样的:
<img id="randImg" class="img_answer" src="randomImage.png">
I tried concatenating, but can't seem to figure this out. 我尝试连接,但似乎无法解决这个问题。 Do I need to create a function that affects the img ID or class?
我是否需要创建一个影响img ID或类的函数? Can anyone point me to the cleanest way to do this?
谁能指出我最干净的方法呢?
var randomImage = 1 + Math.floor(Math.random() * 20);
var imgName = randomImage+".png";
$("#randImg").attr("src",imgName);
Demo: http://jsfiddle.net/a9Ltw/ 演示: http : //jsfiddle.net/a9Ltw/
Spelling it out a bit to help teach: 拼写一下以帮助教导:
On your page you'd have something like this: 在您的页面上,您将拥有以下内容:
<img id=randomImage />
And probably in the head to hide the image until you've picked one to load, this: 并且可能在头部隐藏图像,直到你选择一个加载,这:
<style>
#randomImage {
width: 400px; height: 200px; /* or whatever the dimensions are */
visibility: hidden;
}
</style>
Then in your Javascript: 然后在你的Javascript中:
var ordinal = 1 + Math.floor(Math.random() * 20);
$('#randomImage').css('visibility', 'visible').attr('src', ordinal + '.png');
So the HTML lays out the img tag, and some early CSS sets its dimensions and hides it so there's no ugly broken image icon etc in some browsers - just a blank space. 所以HTML列出了img标签,一些早期的CSS设置它的尺寸并隐藏它,所以在某些浏览器中没有丑陋的破碎图像图标等 - 只是一个空白区域。
Then eventually the Javascript loads and runs, determining a random ordinal. 然后最终Javascript加载并运行,确定随机序数。 The second line of Javascript calls jquery to make the img visible and set its src attribute to the random image.
第二行Javascript调用jquery使img可见并将其src属性设置为随机图像。
$(document).ready(function() {
var randomImage = 1 + Math.floor(Math.random() * 20),
img = randomImage + ".png";
$("#randImg").attr("src", img);
});
只需将一些默认图像添加到img
标签,以防止在用户禁用JavaScript时显示任何内容,然后在jQuery中使用$("#randImg").attr("src", randomImage + ".png");
var thesoruce = "http://localhost:8080/content/dam/admin/" + id ;
g_fb.find('p').append('<img src= '+thesoruce +' height="250px" width="600px">');
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