切换段落的可见性

Toggle Visibility of Paragraph

本文关键字:可见性 段落      更新时间:2023-09-26

我不知道为什么我会遇到问题,只是这是我第一周看到html和javascript,哈哈。但是。。。我的方向是:

添加句子:"请按此查看有关我的更多信息。",其中"this"是按钮上的文本(位于句子中间)。实现必要的JavaScript代码,以便在单击按钮时,会出现一段文字,其中提供有关您的一些背景信息(您出生在哪里或其他什么地方)。每次点击按钮时,它都应该切换该段落的显示(使其在第一次点击后可见,在第二次点击后隐藏,在第三次点击后显示,等等)。此外,当文本可见时,带有按钮的行应更改为以下内容:"请按此按钮隐藏有关我的更多信息。"单击按钮时,单词"see"answers"hide"应交替出现。"

我遇到的麻烦是如何在我点击时使这些段落可见,而不是在我再次点击时使其可见。我根据别人的问题尝试了几种不同的方法,但都不起作用。它最终不会切换任何内容,并使所有内容都可见。

非常感谢。

   <!DOCTYPE html>
<html>
<body style="background-color:#ADD8E6">

<h1>my Page</h1>
<img id="myImage" onclick="changeImage()" src="hrg.jpg" width="280" height="280">
<p title="About me">
stuff about me... 
<br>
<a href="http://www.w3schools.com/" target="_blank">Here is a link to learn more about HTML!</a>
<br>
<br>

</p>


<script>
function changeImage() {
    var image = document.getElementById('myImage');
    if (image.src.match("hrgswitch")) {
        image.src = "hrg.jpg";
    } else {
        image.src = "hrgswitch.jpg";
    }
}

</script>
<script>
function myFunction(obj) {
var x = document.getElementById("me");

  if(("p3").style.visibility == "visible")
        ("p3").style.visibility = 'hidden';
    else
        ("p3").style.visibility = 'visible';
}
</script>
</head>
<body>

<p2> <br>
<br>
Please push this to see more information about me. <br>
 </p2>

<button id = "me" onclick = "myFunction("me")">this </button>
<p3>
<br> 
<br>
Please push this to see my list of courses."
<br>
<br>
<button>this </button>
<br>
more stuff about me <br>
</p3>

<br>
<br>
<br>
<br>
<table style="width:100%">
  <tr>
    <td>Course Name</td>
    <td>Date</td>       
    <td>Time</td>
  </tr>
  <tr>
    <td>Programming Paradigms</td>
    <td>Tuesday / Thursday</td>     
    <td>11:00-12:15</td>
  </tr>
  <tr>
    <td>Computer Organization</td>
    <td>Tuesday / Thursday</td>     
    <td>9:30-10:45</td>
  </tr>
<tr>
    <td>Linear Algebra</td>
    <td>Monday/Wednesday/Friday</td>        
    <td>11:50-12:40</td>
  </tr>
<tr>
    <td>Combinatorics and Discrete Math</td>
    <td>Monday/Wednesday/Friday</td>        
    <td>8:35-9:25</td>
  </tr>
</table>

</body>
</html>

首先有几件小事:

  • 不同的功能不需要单独的脚本块

  • p2和p3不是真正的标签-如果你需要选择一个单独的段落,请使用带有id 的p标签

    <p id="p3">Please push...</p>
    

    在你的javascript中,你会像这样瞄准它:

    var p3 = document.getElementById('p3');
    p3.style.visibility = 'visible'; // for example
    
  • 现在,在你试图瞄准的东西之前,你已经执行了一些脚本。这行不通。尝试将所有脚本分组为一个块,并将其放在标记的相关部分(即按钮、段落等)之后。

正如另一位评论者所指出的,你应该把按钮放在句子里,所以修正它。当你在做的时候,onclick处理者通常是不受欢迎的;给它一个ID并在脚本中绑定到它。这里有一些伪代码;我没有填写函数来进行实际更改,只是记下了它们的去向。

<p>Please push <button id="toggle-button">this</button> 
to <span id="see-hide">see</span> more info about me.</p>
<p id="p3">This is the content that hides or shows depending on click</p>
<script>
  var btn = document.getElementById('toggle-button'),
      image = document.getElementById('myImage'),
      seeHide = document.getElementById('see-hide'),
      toggleableContent = document.getElementById('p3'),
      textIsShowing = false; // to keep track of whether the button has been toggled with this
 /* We can write one function to change the image, the text, 
    and hide/show content all at once */
 function toggleEverything() {
    if( textIsShowing == false ) {
        // change the image
        // change the seeHide span from "show" to "hide"
        // show the toggleableContent paragraph
      textIsShowing = true; // this way, the next click will know we've already clicked once
      return;               // we're done here
    }
   /* this is what happens if textIsShowing is true, 
       because the block above will be skipped */
     // change the image back
     // change the seeHide span from "hide" to "show"
     // hide the toggleableContent paragraph
    textIsShowing = false; // reset this state for the next click
    return;                // and we're done
}
// Now we need to bind this to the button
btn.onclick = toggleEverything();
</script>

好的,我已经更正了您的大部分HTML代码,并使您的功能正常工作:

<!DOCTYPE html>
<html>
    <head>
        <title>About me</title>
        <style>
        body {
            background-color:#ADD8E6;
        }
        table {
            width:100%;
        }
        #p3 {
            display:none;
        }
        #myImage {
            width:280px;
            height:280px;
        }
        </style>
        <script language="javascript">
            function changeImage() {
                var image = document.getElementById('myImage');
                if (image.src.match("hrgswitch")) {
                    image.src = "hrg.jpg";
                } else {
                    image.src = "hrgswitch.jpg";
                }
            }
            function myFunction(obj) {
                if(obj == "me"){
                    if(document.getElementById("p3").style.display == "none" || document.getElementById("p3").style.display == ""){
                        document.getElementById("p3").style.display = "block";
                        document.getElementById("p2").innerHTML = "<br /><br />Please push this to hide more information about me.<br />";
                    } else {
                        document.getElementById("p3").style.display = "none";
                        document.getElementById("p2").innerHTML = "<br /><br />Please push this to see more information about me.<br />";
                    }
                }
            }
        </script>
    </head>
    <body>
        <h1>my Page</h1>
        <img id="myImage" onclick="changeImage();" src="hrg.jpg" />
        <p title="About me">
            stuff about me... 
            <br />
            <a href="http://www.w3schools.com/" target="_blank">Here is a link to learn more about HTML!</a>
            <br />
            <br />
        </p>
        <p id="p2">
            <br />
            <br />
            Please push this to see more information about me. <br />
        </p>
        <button id="me" onclick ="myFunction('me');">this</button>
        <p id="p3">
            <br /> 
            <br />
            Please push this to see my list of courses."
            <br>
            <br>
            <button>this</button>
            <br>
            more stuff about me <br>
        </p>
        <br />
        <br />
        <br />
        <br />
        <table>
            <tr>
                <td>Course Name</td>
                <td>Date</td>       
                <td>Time</td>
            </tr>
            <tr>
                <td>Programming Paradigms</td>
                <td>Tuesday / Thursday</td>     
                <td>11:00-12:15</td>
            </tr>
            <tr>
                <td>Computer Organization</td>
                <td>Tuesday / Thursday</td>     
                <td>9:30-10:45</td>
            </tr>
            <tr>
                <td>Linear Algebra</td>
                <td>Monday/Wednesday/Friday</td>        
                <td>11:50-12:40</td>
            </tr>
            <tr>
                <td>Combinatorics and Discrete Math</td>
                <td>Monday/Wednesday/Friday</td>        
                <td>8:35-9:25</td>
            </tr>
        </table>
    </body>
</html>

首先,您可以使用按钮添加实际的文本行:

<p>
    Please push <button onclick="toggleParagraphVisible();">this</button>
    to <span id="textIsHidden">see</span> more info about me.
</p>

接下来,确保你确实有一段要隐藏和取消隐藏。

<p id="toggleParagraph" style="display:none;">Bio goes here.</p>

最后,只需添加javascript代码:

function toggleParagraphVisible(){
    if(document.getElementById("textIsHidden").innerText == "see"){
        //If the sentence says "see more info"
        //First, change the sentence to read "hide more info"
        document.getElementById("textIsHidden").innerText = "hide";
        //Next, change the display on the paragraph to block,
        //which makes it visible
        document.getElementById("toggleParagraph").style.display = "block";
    } else {
        //If the sentence doesn't say "see more info", revert everything
        document.getElementById("textIsHidden").innerText = "see";
        document.getElementById("toggleParagraph").style.display = "none";
    }
}

除非我做了一些愚蠢的事情(人们无疑会指出这一点),否则这应该奏效。祝你好运!

只做这个

 <button id = "me" onclick = "myFunction('me')">this </button>