11/08/2010
3
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Trong bài viết hướng dẫn sử dụng JavaScript khá ngắn gọn này, Nurani sẽ chỉ bạn cách dùng vài đoạn mã đơn giản để thay đổi kích cỡ chữ trên trang web của mình chỉ với một vài cú nhấn chuột.
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Actually, almost all browsers have a feature to control the characters on the web pages you visit, by pressing the Ctrl key together with + (to zoom in) or - (to zoom out). But there is one other way of adding such a function "dynamic font size" on your site using javascript.
Here is a script that can be used to facilitate the visitors to
control the font size of text on each page of your website/blog. This
will be very useful for readers who struggle with small letters, and
allow the person to enlarge the font size of your writing, so they are
easier to read.
<script type="text/javascript">
var min=8;
var max=18;
function zoominLetter() {
var p = document.getElementsByTagName('p');
for(i=0;i<p.length;i++) {
if(p[i].style.fontSize) {
var s = parseInt(p[i].style.fontSize.replace("px",""));
} else {
var s = 12;
}
if(s!=max) {
s += 1;
}
p[i].style.fontSize = s+"px"
}
}
function zoomoutLetter() {
var p = document.getElementsByTagName('p');
for(i=0;i<p.length;i++) {
if(p[i].style.fontSize) {
var s = parseInt(p[i].style.fontSize.replace("px",""));
} else {
var s = 12;
}
if(s!=min) {
s -= 1;
}
p[i].style.fontSize = s+"px"
}
}
</script>
The script above will change the font size of text within the paragraph (tag <p>). If you want to use another tag, you can change the getElementsByTagName('p');
Of course, this script only works on the page with pixel sized fonts (letter-sized pixels (px)) compared with relative sized fonts (the relative size of the letters like: "em" and "%"). In addition, if the script does not find the font size of a paragraph, it will use the standard size, which is 12px.
How To Use :
Enter the above script on your blog page (either by typing in the tag <head> or by using .js file external and import). To call the function zoominLetter and zoomoutLetter you can use the following HTML code:
<a href="javascript:zoominLetter();">A</a> <a href="javascript:zoomoutLetter();">a</a>
tips: You can change the text A | a with other signs, or replace it with a picture by using tags <img>.
Source: http://www.situsinformasiinternet.com/2010/01/controlling-font-size-blogwebsite-with-javascript.html
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