[英]Changing function parameters onclick?
<div class='unsubscribe'><a id='us$id' href='#' onclick='subscribe(u,$id);'>
<img src='/unsubscribe.jpg' alt='unsubscribe' /></a></div>
onclick how do i change the first parameter in the onclick function to 's'? onclick如何将onclick函数中的第一个参数更改为“ s”? So the next time it will look like this.
因此,下一次它将如下所示。
<div class='unsubscribe'><a id='us$id' href='#' onclick='subscribe(s,$id);'>
<img src='/unsubscribe.jpg' alt='unsubscribe' /></a></div>
I wouldn't do it like you want to. 我不会像你想要的那样做。 See the XY Problem .
请参阅XY问题 。
Instead, what you should so, is keep track of the subscription state of the user, either using a cookie or an identifier on the link ( data-state="s"
), and take notes in the function. 相反,您应该这样做,即使用cookie或链接上的标识符(
data-state="s"
)来跟踪用户的订阅状态,并在函数中记笔记。
Instead of setting onclick in your HTML do it with Javascript soon after. 不久后,您无需在HTML中设置onclick,而是使用Javascript来实现。 I'm assuming you're echoing all your code as a double quoted PHP string because of
'us$id'
: 我假设您因为
'us$id'
而将所有代码作为双引号PHP字符串回显:
<div class='unsubscribe'>
<a id='us$id' href='#'>
<img src='/unsubscribe.jpg' alt='unsubscribe' />
</a>
</div>
<script type='text/javascript'>
document.getElementById('us$id').onclick = function(){
// Subscribe u
subscribe(u, $id);
// Set all future clicks to subscribe s
this.onclick = function(){
subscribe(s, $id);
};
};
</script>
Instead of changing the string in the onclick
, you can change it in the javascript itself. 除了在
onclick
中更改字符串外,您还可以在javascript本身中更改它。 This is if you want to change all of the s to u throughout the page (wasn't sure if there was only one or if this is what your intention is). 这是如果要在整个页面中将所有s更改为u(不确定是否只有一个,或者这是否是您的意图)。
Remove the first parameter: 删除第一个参数:
<div class='unsubscribe'><a id='us$id' href='#' onclick='subscribe($id);'>
<img src='/unsubscribe.jpg' alt='unsubscribe' /></a></div>
Then change subscribe()
to this: 然后将
subscribe()
更改为此:
function subscribe(id)
{
// doing "static" variable in javascript
if (typeof this.foo == 'undefined')
{
this.foo = 's';
}
else
{
this.foo = 'u';
}
...
}
One way would be to change it textually; 一种方法是按文本进行更改; use
var el = document.getElementById('us$id');
使用
var el = document.getElementById('us$id');
to retrieve the element, then search el.attributes
for an attribute with .name
value "onclick", and replace its child with a new TextNode
with the second function call. 检索元素,然后在
el.attributes
中搜索具有.name
值“ onclick”的属性,并使用第二个函数调用用新的TextNode
替换其子级。
A different approach would be to change the HTML so that subscribe will get both u and s, and somehow (eg with a global variable, a static variable, etc.) remember if it's the first or second time that this method is invoked. 另一种方法是更改HTML,以便订阅将同时获取u和s,并以某种方式(例如,使用全局变量,静态变量等)记住该方法是第一次还是第二次被调用。
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