按下按钮PHP后页面上升

Question

I used a calendar from the internet which uses PHP. It has buttons like "next" and "prev", and when I press one of them it takes me to the top of the page. How can I fix that?

This is the code where I create the calendar:

    return
        '<div class="header">'.
            '<a class="prev" href="'.$this->naviHref.'?
            month='.sprintf('%02d',$preMonth).'&year='.$preYear.'">Prev</a>'.
           '<span class="title">'.date('Y M',strtotime($this->currentYear.'-'.$this->currentMonth.'-1')).'</span>'.
           '<a class="next" href="'.$this->naviHref.'?month='.sprintf("%02d", $nextMonth).'&year='.$nextYear.'">Next</a>'.
        '</div>';
    }

And here calendar.php

https://ideone.com/SkECOp

Answer 1

I think the problem lies not in your updated code, but in assigning $_SERVER['PHP_SELF'] to naviHref in the constructor.

public function __construct() {
    $this->naviHref = htmlentities($_SERVER['PHP_SELF']);
}

Read the $_SERVER['PHP_SELF'] value in the script where you create the Calendar instance and pass that value as argument to the Calendar constructor. In which it will be assigned to naviHref .

Also, the first two lines inside show() are raising notices

$year == null;
$month == null;

Change them to

$year = null;
$month = null;

Edit :

In order to use your calender component, you have to create an instance of it, an object of Calendar type, like this:

$calendar = new Calendar();

This takes place in a php file.

But before doing this step, assign the value of $_SERVER['PHP_SELF'] to a variable. Like this:

$naviHref = htmlentities($_SERVER['PHP_SELF']);

And after that create your object of type Calendar , by passing it the variable, as argument. Like this:

$calendar = new Calendar($naviHref);

So, in the end you will have the following code in your php page:

$naviHref = htmlentities($_SERVER['PHP_SELF']);
$calendar = new Calendar($naviHref);

echo $calendar->show();

After this, go to the Calendar constructor and change it like this:

public function __construct($naviHref) {
    $this->naviHref = $naviHref;
}

This way you injected the variable $naviHref into your object of class Calendar .