onblur & onfucus on PHP echo

Question

这是我的PHP代码的一部分，其中有一个echo，它将打印一些具有onblur和onfocus条件的HTML代码。此代码在echo外部但不在其内部时工作。
我已经尝试在代码中的第一个input(Username字段(上添加双引号，但仍然不起作用
有什么想法吗？！

elseif ($_GET['register'] == "true"){ echo "
    <div class='index_register'>
        Register to Play or <a href='login.php'>login</a>
        <p></p>
        <!-- Registration Form -->
        <form action='?do=register' method='post' autocomplete='off'>
            <input class="input_reg" type="text" name="username" size="40" maxlength="12" value="Username" onblur="if (this.value == "") {this.value = "Username";}" onfocus="if (this.value == "Username") {this.value = "";}">
            <input class='input_reg' type='text' name='email' size='40' maxlength='50' value='Email Address' onblur='if (this.value == '') {this.value = 'Email Address';}' onfocus='if (this.value == 'Email Address') {this.value = '';}'>
            <input class='input_reg' type='password' name='password' size='40' maxlength='12' value='Password' onblur='if (this.value == '') {this.value = 'Password';}' onfocus='if (this.value == 'Password') {this.value = '';}'>
            <input class='submit' type='submit' value='Register' name='Register'>
        </form>
    </div>
"; }

Answer 1

此代码在echo之外但不在echo内部时工作

不要使用回波，然后使用

elseif ($_GET['register'] == "true"){ 
?>
    <div class='index_register'>
        Register to Play or <a href='login.php'>login</a>
        <p></p>
        <!-- Registration Form -->
        <form action='?do=register' method='post' autocomplete='off'>
...
        </form>
    </div>
<?
 }

Answer 2

以下是您需要的。您需要正确onblr/onfocus:内的escape quotes

在php代码中试试这个：

<input class="input_reg" type="text" name="username" size="40" maxlength="12" value="Username" onblur='if (this.value == "") {this.value = "Username";}' onfocus='if (this.value == "Username") {this.value = "";}'>

<input class='input_reg' type='text' name='email' size='40' maxlength='50' value='Email Address' onblur='if (this.value == "") {this.value = "Email Address";}' onfocus='if (this.value == "Email Address") {this.value = "";}'>

<input class='input_reg' type='password' name='password' size='40' maxlength='12' value='Password' onblur='if (this.value == "") {this.value = "Password";}' onfocus='if (this.value == "Password") {this.value = "";}'>

Answer 3

在您的情况下，当您输出大块时，首选heredoc或nowdoc语法：

<?php
echo <<<HTM
    <div class='index_register'>
        Register to Play or <a href='login.php'>login</a>
        <p></p>
        <!-- Registration Form -->
        <form action='?do=register' method='post' autocomplete='off'>
            <input class='input_reg' type='text' name='username' size='40' maxlength='12' value='Username' onblur='if (this.value == "") {this.value = "Username";}' onfocus='if (this.value == "Username") {this.value = "";}'>
            <input class='input_reg' type='text' name='email' size='40' maxlength='50' value='Email Address' onblur='if (this.value == "") {this.value = "Email Address";}' onfocus='if (this.value == "Email Address") {this.value = "";}'>
            <input class='input_reg' type='password' name='password' size='40' maxlength='12' value='Password' onblur='if (this.value == "") {this.value = "Password";}' onfocus='if (this.value == "Password") {this.value = "";}'>
            <input class='submit' type='submit' value='Register' name='Register'>
        </form>
    </div>
HTM;
?>

Answer 4

如果使用Heredoc系统，则不必转义引号。我使用嵌入了JavaScript的Heredoc，就好像我使用的是纯HTML一样，一切都正常工作。