Javascript 以编程方式更改 img 标签的 src
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Programmatically change the src of an img tag
提问by Jam Ville
How can I change the srcattribute of an imgtag using javascript?
如何使用 javascript更改标签的src属性img？
<img src="../template/edit.png" name=edit-save/>
at first I have a default src which is "../template/edit.png" and I wanted to change it with "../template/save.png" onclick.
起初我有一个默认的 src，它是“../template/edit.png”，我想用“../template/save.png” onclick 来改变它。
UPDATED: here's my html onclick:
更新：这是我的 html onclick：
<a href='#' onclick='edit()'><img src="../template/edit.png" id="edit-save"/></a>
and my JS
和我的 JS
function edit()
{
var inputs = document.myform;
for(var i = 0; i < inputs.length; i++) {
inputs[i].disabled = false;
}
}
I've tried inserting this inside the edit(), it works but need to click the image twice
我试过在edit()中插入这个，它可以工作，但需要点击图片两次
var edit_save = document.getElementById("edit-save");
edit_save.onclick = function(){
this.src = "../template/save.png";
}
采纳答案by Jam Ville
its ok now
现在好了
function edit()
{
var inputs = document.myform;
for(var i = 0; i < inputs.length; i++) {
inputs[i].disabled = false;
}
var edit_save = document.getElementById("edit-save");
edit_save.src = "../template/save.png";
}
回答by Matthias
Give your img tag an id, then you can
给你的img标签一个id，然后你就可以
document.getElementById("imageid").src="../template/save.png";
回答by chandanjha
You can use both jquery and javascript method: if you have two images for example:
您可以同时使用 jquery 和 javascript 方法：例如，如果您有两个图像：
<img class="image1" src="image1.jpg" alt="image">
<img class="image2" src="image2.jpg" alt="image">
1)Jquery Method->
1)Jquery方法->
$(".image2").attr("src","image1.jpg");
2)Javascript Method->
2)Javascript方法->
var image = document.getElementsByClassName("image2");
image.src = "image1.jpg"
For this type of issue jquery is the simple one to use.
对于这种类型的问题，jquery 使用起来很简单。
回答by Alessandro Pirovano
if you use the JQuery library use this instruction:
如果您使用 JQuery 库，请使用以下说明：
$("#imageID").attr('src', 'srcImage.jpg');
回答by Donatas Olsevi?ius
<img src="../template/edit.png" name="edit-save" onclick="this.src = '../template/save.png'" />
回答by Marcelo Camargo
In this case, as you want to change the srcof the first value of your element, you have no need to build up a function. You can change this right in the element:
在这种情况下，由于您想更改src元素的第一个值，因此无需构建函数。您可以在元素中更改此权限：
<a href='#' onclick='this.firstChild.src="../template/save.png"')'>
<img src="../template/edit.png" id="edit-save"/>
</a>
You have several ways to do this. You can also create a function to automatize the process:
您有几种方法可以做到这一点。您还可以创建一个函数来自动化该过程：
function changeSrc(p, t) { /* where p: Parent, t: ToSource */
p.firstChild.src = t
}
Then you can:
然后你可以：
<a href='#' onclick='changeSrc(this, "../template/save.png");'>
<img src="../template/edit.png" id="edit-save"/>
</a>
回答by Fabrizio Calderan
With the snippet you provided (and without making assumptions about the parents of the element) you could get a reference to the image with
使用您提供的代码段（并且不假设元素的父元素），您可以获得对图像的引用
document.querySelector('img[name="edit-save"]');
and change the src with
并更改 src
document.querySelector('img[name="edit-save"]').src = "..."
so you could achieve the desired effect with
所以你可以达到预期的效果
var img = document.querySelector('img[name="edit-save"]');
img.onclick = function() {
this.src = "..." // this is the reference to the image itself
};
otherwise, as other suggested, if you're in control of the code, it's better to assign an idto the image a get a reference with getElementById(since it's the fastest method to retrieve an element)
否则，正如其他人建议的那样，如果您控制代码，最好为id图像分配一个获取引用的引用getElementById（因为它是检索元素的最快方法）
回答by Ben
Give your image an id. Then you can do this in your javascript.
给你的图片一个id。然后你可以在你的javascript中做到这一点。
document.getElementById("blaah").src="blaah";
You can use the ".___" method to change the value of any attribute of any element.
您可以使用“.___”方法来更改任何元素的任何属性的值。
回答by Po Po
Maybe because you have a tag like a parent of the tag. That why you have to click two time the images.
也许是因为你有一个标签，比如标签的父级。这就是为什么您必须单击两次图像的原因。
For me the solution is this: http://www.w3schools.com/js/tryit.asp?filename=tryjs_intro_lightbulb
对我来说，解决方案是这样的：http: //www.w3schools.com/js/tryit.asp?filename=tryjs_intro_lightbulb
