JavaScript <a>href 替换不起作用</a>

Question

I'm making a font download resource website, and this is my JS and some of my html:

 var element, text, font, download, value; function tick() { element = document.getElementById("text"); font = document.getElementById("fontfamily"); text = document.getElementById("dummy-text"); download = document.getElementById("downlink"); text.innerHTML = element.value; text.style.fontFamily = font.value; value = font.value + ".tff"; download.setAttribute("href", value); }

 <input type="text" id="text" value="Lorem ipsum dolor set amit."> <select id="fontfamily"> <optgroup label="Apple"> <option>Helvetica Neue</option> </optgroup> <optgroup label="Google"> <option>Roboto Regular</option> <option>Roboto Light</option> <option>Roboto Bold</option> <option>Roboto Italic</option> </optgroup> <optgroup label="Monotype"> <option>Century Gothic</option> </optgroup> <optgroup label="Nintendo"> <option>Wii Sans Regular</option> <option value="SMW">Super Mario World Sans</option> </optgroup> </select><button onclick="tick()">Set Text</button> <br><br> <h1 id="dummy-text" style="font-family: Helvetica Neue;">Lorem ipsum dolor set amit.</h1><a href="Helvetica Neue.ttf" id="downlink"><button style="margin: 0;">Download</button></a>

but when I press "Download", the link I went to was [object%20HTMLSelectElement].tff, which obviously does not exist.

Any help?

Answer 1

The problem that you have at the moment, is that you are setting an attribute, not setting the href. To set your href do

let download = document.getElementById("downlink");
download.href = "https://example.com";

and that should fix it!

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Answer 2

After running the snippet I see that even if it is setting the correct value to href , it is getting URL encoded when you click on the Download button.

And that's how Roboto Regular will become Roboto%20Regular .

Add download attribute to <a> tag to specify that the target will be downloaded when a user clicks on the hyperlink.

 var element, text, font, download, value; function tick() { element = document.getElementById("text"); font = document.getElementById("fontfamily"); text = document.getElementById("dummy-text"); download = document.getElementById("downlink"); text.innerHTML = element.value; text.style.fontFamily = font.value; value = font.value + ".tff"; download.href = value; }

 <input type="text" id="text" value="Lorem ipsum dolor set amit."> <select id="fontfamily"> <optgroup label="Apple"> <option>Helvetica Neue</option> </optgroup> <optgroup label="Google"> <option>Roboto Regular</option> <option>Roboto Light</option> <option>Roboto Bold</option> <option>Roboto Italic</option> </optgroup> <optgroup label="Monotype"> <option>Century Gothic</option> </optgroup> <optgroup label="Nintendo"> <option>Wii Sans Regular</option> <option value="SMW">Super Mario World Sans</option> </optgroup> </select><button onclick="tick()">Set Text</button> <br><br> <h1 id="dummy-text" style="font-family: Helvetica Neue;">Lorem ipsum dolor set amit.</h1><a href="Helvetica Neue.ttf" id="downlink"><button style="margin: 0;" download>Download</button></a>