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CD-497Appendix F . Examples from Parts III and IV Yet another way is to deal with the field values directly in an embedded event handler instead of calling an external function (which is easier to maintain because all scripts are grouped together in the Head). With the function removed from the document, the event handler attribute of the tag changes to do all the work: The right-hand side of the assignment expression extracts the current contents of the field and (with the help of the toUpperCase() method of the string object) converts the original string to all uppercase letters. The result of this operation is assigned to the value property of the field. The application of the this keyword in the previous examples may be confusing at first, but these examples represent the range of ways in which you can use such references effectively. Using this by itself as a parameter to an object s event handler refers only to that single object a text object in Listing 25-3. If you want to pass along a broader scope of objects that contain the current object, use the thiskeyword along with the outer object layer that you want. In Listing 25-2, I sent a reference to the entire form along by specifying this.form meaning the form that contains this object, which is being defined in the line of HTML code. At the other end of the scale, you can use similar-looking syntax to specify a particular property of the thisobject. Thus, in the last example, I zeroed in on just the value property of the current object being defined this.value. Although the formats of this.form and this.value appear the same, the fact that one is a reference to an object and the other just a value can influence the way your functions work. When you pass a reference to an object, the function can read and modify properties of that object (as well as invoke its functions); but when the parameter passed to a function is just a property value, you cannot modify that value without building a complete reference to the object and its value. Methods blur() NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility document.formObject.textObject.blur()
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