Javascript-HTML - how to iterate through all the forms on a page?

问题

How can I iterate through all forms in a document using javascript?

回答1:

The code below will go through an html document, get all forms and do a pop-up alert of the names of each form.

var formsCollection = document.getElementsByTagName("form");
for(var i=0;i<formsCollection.length;i++)
{
   alert(formsCollection[i].name);
}

This is just a start to see if you are getting the reult you require. Thereafter, remove the alert and continue to do what you need to.

回答2:

You can use

document.forms collection

See forms Collection

回答3:

Here's an example using the document.forms instead of getElementsByTagName().

As with the getElementsByTagName() example this goes through all the forms and does a popup alert with the action (instead of name, as it is more likely to be set).

var formsCollection;
var r;

formsCollection=document.forms;

for(r=0;r<formsCollection.length;r++)
{
    alert(formsCollection[r].action);
}

This can be condensed down and of course the popup changed to something useful but I have tried to keep it simple.

And for reference here are some links to more info:

• Mozilla Developer Network
• Microsoft
• w3c
• And even w3schools

来源：https://stackoverflow.com/questions/2146348/javascript-html-how-to-iterate-through-all-the-forms-on-a-page