1 JS way to call PHP file and get the value in PHP
Give a simple example to illustrate:
As in the page a.html the following sentence is called:
<script type= "Text/javascript" src= "b.php?action=test" ></script><script type= "Text/javascript" > Alert (Jstext);</script>
There is a PHP code in b.php:
<? $action =$_get[' action ']; echo "var jstext= ' $action '"; Output A JS statement, generate a JS variable, and assign a value of PHP variable $action value//echo "var jstext= ' AA '"; echo "var jstext=". "' $action ' ";?>
When the a.html file is executed, the b.php file is called and the output of the b.php file is executed as a JS statement, so a prompt box pops up with the value of the JS variable jstext, which is the value assigned to Jstext in the PHP file.
Summary:
In the HTML with the JS call file to the PHP file, the output of the PHP file will be called the page as JS code to use.
2 PHP calls the value in JS
There is a piece of code in the z.php page:
<script type= "Text/javascript" > var url= "aaaa*"; </script> <? $key = "<script type=text/javascript>document.write (URL) </script>"; echo $key;?>
3 PHP calls the method (function) in JS
<script type= "Text/javascript" > Function test () { var t1=3; T1 = t1+2; alert (t1); return t1; } </script><?php echo "<script type= ' Text/javascript ' >test ();</script>";?>4 JS Call PHP variable
(1)
<?php$userid=100;? > <script>var userid;userid=document.getelementbyidx_x_x_x ("userid"). Value;alert (userid); </script ><input type= "text" name= "userid" id= "userid" value= "<?php echo $userId;?>" >(2)
<?php$url = ' changed URLs '; Define variables? ><script type= "Text/javascript" >//js call php variable var ds = "<?php echo $url?>"; Assignment alert (DS); Output effect </script>5 -------------------------------<script language= "JavaScript" > <!--var y=<? PHP echo Date (' Y ')? >,m=<?php echo Date (' n ')? >,d=<?php Echo Date (' J ')?>;--></script>6 Write your own JS and PHP call each other
1.php content:
<?php//echo "<script language= ' JavaScript ' >alert (' $php variable ');</script>"; The simplest PHP call Js//echo "<a href=#></a> ";//echo" <a href= ' 3.php ' >aaaa</a> "; PHP hyperlink//echo "<script type= ' text/javascript ' language= ' JavaScript ' >phpmake (' PHP Build Station learning Note net ');</script> "; Sometimes it is necessary to invoke the JavaScript custom function during PHP execution (error in validation) echo "function ok (msg) {alert (msg);}";? ><HTML><HEAD><TITLE> php good way to invoke JS file </TITLE></HEAD><BODY><!-- JS calls PHP defined in js--><scrīpt language= ' javascrīpt ' type= ' text/javascrīpt ' src= ' 1.php ' ></scrīpt> <scrīpt>ok ("aaaaaa!"); </scrīpt></script></BODY></HTML>2.php content:
<!--JS call php--><?php$userid=100;? ><script>var userid;userid=document.getelementbyidx_x ("userid"). Value;alert (userid);</script> <input type= "text" name= "userid" id= "userid" value= "<?php echo $userId;?>" > <!--js call php-->< PHPIF ($_get["Action"]== "OK") {echo "I ' m ok!";} Else{echo "I ' m not ok!";}? ><script Language = "JavaScript" >function func () {if (Confirm ("is OK with this?")) {this.location = "Ok.php?action=ok";} Else{this.location = "Ok.php?action=cancel";}} </script><!--JS Call php-->
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