Php 在加载时调用 javascript
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Php calling javascript on load
提问by Veljko89
Guys i have little problem with PHP to call Javascript function on load ... Idea is when page load i do little calculation with PHP stuff , so when i finish that all i want is to write that down in same DOM element using javascript. I will not show you PHP code for calculation as i am 100% sure it is alright. This is the code i got so far , so can you just tell me whats wrong with it?
伙计们，我对 PHP 在加载时调用 Javascript 函数没有什么问题......想法是当页面加载时我很少用 PHP 计算，所以当我完成我想要的就是使用 javascript 在同一个 DOM 元素中写下它。我不会向您展示用于计算的 PHP 代码，因为我 100% 确定它没问题。这是我到目前为止得到的代码，所以你能告诉我它有什么问题吗？
$test = 100;
echo "<script language=javascript> window.onload=UpdatePoints($test); </script>";
and Javascript function is simple
和 Javascript 功能很简单
function UpdatePoints(Points) {
document.getElementById('PointsNumber').innerHTML = Points;
}
Thanks in advance
提前致谢
回答by Michael Berkowski
Instead of calling the function UpdatePoints()in window.onload, you need to wrap the call in a function that gets assigned by reference to window.onload. Otherwise, you are calling the function, and assigning its return value to window.onload.
您需要将调用包装在通过引用分配给 的函数UpdatePoints()中window.onload，而不是在 中调用函数window.onload。否则，您正在调用该函数，并将其返回值分配给window.onload.
// This function wraps UpdatePoints($test)
// and is assigned as a reference to window.onload
function load() {
UpdatePoints(<?php echo $test; ?>);
}
echo "<script type='text/javascript'> window.onload=load; </script>";
Note that the languageattribute to the <script>tag is deprecated. Include a type=text/javascriptattribute in its place (though text/javascript is genearlly the browser default)
请注意，标签的language属性<script>已被弃用。type=text/javascript在其位置包含一个属性（尽管 text/javascript 通常是浏览器的默认设置）
However, since the value of $testis created before the page loads and cannot change when the function is called, you might as well not bother passing it as a parameter, in which case you don't need to wrap the function. Just remove the ()to assign it as a reference.
但是，由于 的值$test是在页面加载之前创建的，并且在调用函数时无法更改，因此您最好不要将其作为参数传递，在这种情况下，您不需要包装函数。只需删除()即可将其分配为参考。
echo "<script type='text/javascript'> window.onload=UpdatePoints; </script>";
function UpdatePoints() {
// PHP write directly into the function since the value
// can't change... It's always going to be passed as what PHP assigns
// if you call it as UpdatePoints($test)
var Points = $test;
document.getElementById('PointsNumber').innerHTML = Points;
}
