Calling a JavaScript function returned from an Aja-第2页回答

余欢

2楼-- · 2019-01-01 02:43

With jQuery I would do it using getScript

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浪荡孟婆

3楼-- · 2019-01-01 02:46

Just remember if you create a function the way below through ajax...

function foo()
{
    console.log('foo');
}

...and execute it via eval, you'll probably get a context problem. Take this as your callback function:

function callback(result)
{
    responseDiv = document.getElementById('responseDiv');
    responseDiv.innerHTML = result;
    scripts = responseDiv.getElementsByTagName('script');
    eval(scripts[0]);
}

You'll be declaring a function inside a function, so this new function will be accessible only on that scope.

If you want to create a global function in this scenario, you could declare it this way:

window.foo = function ()
{
    console.log('foo');
};

But, I also think you shouldn't be doing this...

Sorry for any mistake here...

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几人难应

4楼-- · 2019-01-01 02:46

If your AJAX script takes more than a couple milliseconds to run, eval() will always run ahead and evaluate the empty response element before AJAX populates it with the script you're trying to execute.

Rather than mucking around with timing and eval(), here is a pretty simple workaround that should work in most situations and is probably a bit more secure. Using eval() is generally frowned upon because the characters being evaluated as code can easily be manipulated client-side.

Concept

Include your javascript function in the main page. Write it so that any dynamic elements can be accepted as arguments.
In your AJAX file, call the function by using an official DOM event (onclick, onfocus, onblur, onload, etc.) Depending on what other elements are in your response, you can get pretty clever about making it feel seamless. Pass your dynamic elements in as arguments.
When your response element gets populated and the event takes place, the function runs.

Example

In this example, I want to attach a dynamic autocomplete list from the jquery-ui library to an AJAX element AFTER the element has been added to the page. Easy, right?

start.php

<!DOCTYPE html>
<html>
<head>
<title>Demo</title>
<!-- these libraries are for the autocomplete() function -->
<link rel="stylesheet" type="text/css" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/themes/ui-lightness/jquery-ui.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js"></script>
<script type="text/javascript">
<!--
// this is the ajax call
function editDemoText(ElementID,initialValue) {
    try { ajaxRequest = new XMLHttpRequest();
    } catch (e) {
    try { ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
    try { ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
    } catch (e) {
    return false;
    }}}
    ajaxRequest.onreadystatechange = function() {
        if ( ajaxRequest.readyState == 4 ) {
            var ajaxDisplay = document.getElementById('responseDiv');
            ajaxDisplay.innerHTML = ajaxRequest.responseText;
            }
        }
    var queryString = "?ElementID="+ElementID+"&initialValue="+initialValue;
    ajaxRequest.open("GET", "ajaxRequest.php"+queryString, true);
    ajaxRequest.send(null);
    }

// this is the function we wanted to call in AJAX, 
// but we put it here instead with an argument (ElementID)
function AttachAutocomplete(ElementID) {
    // this list is static, but can easily be pulled in from 
    // a database using PHP. That would look something like this:
    /*
     * $list = "";
     * $r = mysqli_query($mysqli_link, "SELECT element FROM table");
     * while ( $row = mysqli_fetch_array($r) ) {
     *    $list .= "\".str_replace('"','\"',$row['element'])."\",";
     *    }
     * $list = rtrim($list,",");
     */
    var availableIDs = ["Demo1","Demo2","Demo3","Demo4"];
    $("#"+ElementID).autocomplete({ source: availableIDs });
    }
//-->
</script>
</head>
<body>
<!-- this is where the AJAX response sneaks in after DOM is loaded -->
<!-- we're using an onclick event to trigger the initial AJAX call -->
<div id="responseDiv"><a href="javascript:void(0);" onclick="editDemoText('EditableText','I am editable!');">I am editable!</a></div>
</body>
</html>

ajaxRequest.php

<?php
// for this application, onfocus works well because we wouldn't really 
// need the autocomplete populated until the user begins typing
echo "<input type=\"text\" id=\"".$_GET['ElementID']."\" onfocus=\"AttachAutocomplete('".$_GET['ElementID']."');\" value=\"".$_GET['initialValue']."\" />\n";
?>

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若你有天会懂

5楼-- · 2019-01-01 02:49

PHP side code Name of file class.sendCode.php

<?php
class  sendCode{ 

function __construct($dateini,$datefin) {

            echo $this->printCode($dateini,$datefin);
        }

    function printCode($dateini,$datefin){

        $code =" alert ('code Coming from AJAX {$this->dateini} and {$this->datefin}');";
//Insert all the code you want to execute, 
//only javascript or Jquery code , dont incluce <script> tags
            return $code ;
    }
}
new sendCode($_POST['dateini'],$_POST['datefin']);

Now from your Html page you must trigger the ajax function to send the data.

....  <script src="http://code.jquery.com/jquery-1.9.1.js"></script> ....
Date begin: <input type="text" id="startdate"><br>
Date end : <input type="text" id="enddate"><br>
<input type="button" value="validate'" onclick="triggerAjax()"/>

Now at our local script.js we will define the ajax

function triggerAjax() {
    $.ajax({
            type: "POST",
            url: 'class.sendCode.php',
            dataType: "HTML",
            data : {

                dateini : $('#startdate').val(),
                datefin : $('#enddate').val()},

                  success: function(data){
                      $.globalEval(data);
// here is where the magic is made by executing the data that comes from
// the php class.  That is our javascript code to be executed
                  }


        });
}

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只若初见

6楼-- · 2019-01-01 02:52

This code work as well, instead eval the html i'm going to append the script to the head

function RunJS(objID) {
//alert(http_request.responseText);
var c="";
var ob = document.getElementById(objID).getElementsByTagName("script");
for (var i=0; i < ob.length - 1; i++) {
    if (ob[i + 1].text != null) 
       c+=ob[i + 1].text;
}
var s = document.createElement("script");
s.type = "text/javascript";
s.text = c;
document.getElementsByTagName("head")[0].appendChild(s);
}

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几人难应

7楼-- · 2019-01-01 02:52

Note: eval() can be easily misused, let say that the request is intercepted by a third party and sends you not trusted code. Then with eval() you would be running this not trusted code. Refer here for the dangers of eval().

Inside the returned HTML/Ajax/JavaScript file, you will have a JavaScript tag. Give it an ID, like runscript. It's uncommon to add an id to these tags, but it's needed to reference it specifically.

<script type="text/javascript" id="runscript">
    alert("running from main");
</script>

In the main window, then call the eval function by evaluating only that NEW block of JavaScript code (in this case, it's called runscript):

eval(document.getElementById("runscript").innerHTML);

And it works, at least in Internet Explorer 9 and Google Chrome.

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Calling a JavaScript function returned from an Aja

Concept

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